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LABORATORY 
APPARATUS 



FOR 



CHEMICAL, INDUSTRIAL, METALLURGICAL, 
BACTERIOLOGICAL, BIOLOGICAL, BOARD 
OF HEALTH, HOSPITAL AND SOIL TESTING 

LABORATORIES 



Catalog C 



No. 222 



Established 
1889 



A. H. McCONNELL, President 
H. C. ARMS. Vice-President. 
J. M. ROBERTS. Secretary. 



Incorporated 
1900 



Central Scientific Co 

460 East Ohio Street 

(Lake Shore Drive, Ohio and Ontario Streets) 

CHICAGO 

U. S. A. 

Cable Address— CENCO. 
CODES: Western Union and A.B.C., 5th Edition. 



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CENTBAL SCIENTIFIC CO., 'HK'AGO, IT. S. A. 












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CENTRAL SCIENTIFIC CO., CHICAGO, U. 8, A. 




The Central Corridor of Our Spacious and Well Lighted Offices. 




One of Our Display Rooms. 



2NTEAL SCTENTmC CO, CHICAG0 L U L 8 1 A : 



CEN 




Looking Down the Central Aisle of Our Instrument Shop. 




Our Heavy Duty Machinery Room. 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A, 




One of Our Chemical Stock Rooms. 






# » 




One Corner of Our Glass Shop, which Includes in Addition to the Lamp Room (shown 
here) a Graduating and Grinding Room, an Acid Room, an Annealing Furnace, a Stock 
and Preparation Room and a Business Office, 



6 



CENTS \l. SCIENTIFIC CO., CHICAGO, U. 8. \ 







A View of Our Shipping Room. 




One Section of Stock Bins Showing How Goods are Stored When Taken Out of the 
Original Cases. Over 40,000 Square Feet of Floor Space are Occupied by Our Stock of 
Scientific Apparatus. Note the Unit Packing System and the Use of Corrugated Boxes, 
Insuring Safe Arrival and Clean Apparatus. 




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CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



TO OUR CUSTOMERS 

In preparing this edition of our Chemical, Industrial and Bacteriological Catalog, we have endeav- 
ored to take into consideration all of the factors which influence selection of scientific apparatus by 
the varied and ever increasing group of scientific workers in the laboratories of this and other countries. 

STANDARDIZATION BY AMERICAN CHEMICAL SOCIETY. 

In accordance with the urgent recommendation of the United States Department of Commerce, we 
have joined heartily in the movement to standardize types and sizes wherever possible, eliminating all 
those which appear unnecessary and obsolete. In this we have been guided chiefly by the desires of 
the American Chemical Society as expressed through the reports of the Committee on Standardization, 
published in the official journals of the society*, and have omitted from this catalog types and sizes 
recommended hy them for elimination. Since a reduction in the number of items handled increases the 
production and decreases the overhead expense of each, a material saving to the buyer is effected 
through reduced costs. A further advantage lies in the smaller investment in the numerous types of ap- 
paratus rarely used, and in the possibility of different laboratories in the same institution making use 
of the same stock of apparatus. We hope, therefore, that we may be supported in this action by the 
scientists of this country in whose behalf and at whose request this action was undertaken. 

• SPECIAL ITEMS. 

Any items formerly offered, which are not found in this catalog, are classed by us as "specials" 
upon which prices will be quoted upon request to any who are interested. Such prices will naturally be 
higher in proportion than those of merchandise made in large quantities and carried in stock. 

POLICY. 

The policy of handling only American made apparatus and chemicals was adopted by us only after 
careful consideration and was consistently carried out as long as we were assured of the support of 
American scientist-. It has been with the greatest reluctance that we have been compelled in some 
instances to depart from this policy, due either to actual demand on the part of laboratory workers for 
certain specific items of foreign manufacture or to their unwillingness or inability to pay the higher 
prices for domestic material necessitated by higher labor costs, difference in rate of exchange, etc, 

PROMPT DELIVERIES. 

It is our ambition to render the greatest service possible to scientific workers and we realize that 
promptness in securing supplies is one of their foremost requirements. With this in mind we have built 
up a large stock of tin- material in most common use which we endeavor to maintain at all times in 
order to be able to make shipment at once of any reasonable order. Of the less common items we at- 
tempt to carry a sufficient stock to iusure ample time for replenishments without the necessity of back- 
ordering. 

PRICES. 

In accordance with the tendency toward lower prices we have reduced our prices as much as lowered 
costs would permit. Upon goods of our own manufacture we have anticipated reductions in cost on 
future lots in order that our catalog prices may remain stable as long as possible. Additional reductions 
in price will continue to be put into effect as rapidly as new costs are realized. This should be kept 
in mind in making any comparisons of printed prices. 

OUR RESPONSIBILITY. 

We employ only experienced packers and use every precaution to make sure that no items aTe omit- 
ted from the shipment and that everything is well packed to withstand transportation. However, in 
spite of such safeguards errors are occasionally made in our own organization, and there is no assurance 
that even the most carefully packed material will survive the hazards of damage in transit. Realizing 
that we are better equipped to press claims for damage than are most of our customers, we are glad to 
assume this responsibility, provided an immediate detailed report is made of the damage on blanks sent 
by us in every box, accompanied by the proper affidavit. Without awaiting the successful adjustment 
of the claim, we will proceed at once to make replacement or issue credit, as desired, for the damaged 
items. To cover the expense involved, a nominal insurance charge is made on each shipment, unless we 
are instructed to the contrary, in which event goods will be scut at the shipper's risk. 

GUARANTEE. 
All items purchased from US are sent out under our positive guarantee that they meet fully the 
specifications contained in our catalog, and any items found defective in any respect should be returned 
at once al our expense. Furthermore, any items purchased from us which, upon examination, are found 
not to satisfy the customer's requirements, even though they fulfill our catalog specifications, may be 
returned for credit. In such cases a charge of ten per cent will be made to cover the expenses of inspec- 
tion, unpacking and rr packing. 

ORIGINAL CASES. 
We especially recommend that our customers take advantage of quantity purchases. American manufacturers 
of glassware, porcelain and filter paper have made it possible to secure these commodities in original case lots at 
wholesale prices. 

COPYRIGHT NOTICE. 
Special notice is given to the trade that this catalog is copyrighted, and that unauthorized reproduction of new 
cuts or illustrations therefrom constitutes actionable infringement of our rights. We shall use every legal means to 
protect our work and property. 

CENTRAL SCIENTIFIC COMPANY. 

Copyrighted, 1922, by Central Scientific Company. 

*W. D. Collins, Chairman. Journal of Industrial and Engineering Chemistry, Vol. XIII. No. 5, page 402 and 
No. 11. pftire 1070; also Vol, XIV. No. 7. page 654. 



ABSORPTION TUBES CENTRAL SCIENTIFIC CO., CH ICAGO, U. S. A- 




MoJ 10. 



No. 112. 



No. 114, 



No. 3131 



No. 1 22. 





No. 120. 



4 oz. 
.40 



16. 
.70 



i [bs. 

2.65 



102. ABSORBENT COTTON, best quality. 

size of package 1 oz - 

EacH $0.22 

ABSORPTION APPARATUS for Chlorine, see No. 2828. 

ABSORPTION BULBS, see Potash Bulbs. 

110. ABSORPTION TUBE, Emmerling's, filled with glass beads. Total length, 15 Vi inches; diam- 
eter of body, 1 inch. Will take an 8 inch column of beads 2-50 

112. ABSORPTION TUBE, Fisher's, for the absorption of carbon dioxide 01 water in elementary 
organic analysis in place of the usual U tubes. It has the following advantages: 30 ce capac- 
ity instead of 22 cc of the ordinary 11 cm U tubes; iuotc easily and thoroughly cleaned; 
only one hollow stopper which shuts off both openings with one turn; will stand on the bal- 
ancc pan; and needs no hangers when joined in the absorption train. When filled, the bottle 
weighs about 65 grams. (See Journal of Industrial and Engineering Chemistrv, Vol VIII, No. 
4, for April 1916, page 368) * 4.00 

114. ABSORPTION TUBE, Pleming-Martin, for carbon determinations in iron and steel by the com- 
bustion method. Very rapid and exact, retaining every trace of carbon dioxide and moisture. 
One charge of soda lime will absorb 100 combustions, or one charge of phosphorus pentoxide 
300 combustions on a 1.5 gram sample of <>.7."i per cent, carbon steel 5.00 

118. ABSORPTION TUBE, as used by the Illinois Steel Company for absorptions in barium hydrox- 
ide, consisting of 9 bulbs with bent stem, for use with a 500 cc Erlenmeyer flask. Total length 
of tube, 20% inches. Without flask. See Journal of Industrial and Engineering I hemistry, 
Vol. VI, No, 10, for October 1914, page 844) 1.20 

3132. ABSORPTION TUBE, Johnson's, as used in the carbon combustion train devised by C. M. 
Johnson of the Crucible steel Co. For complete description of the <'<<mhustion train, see %*■• 
3120 1.80 

12)1. ABSORPTION TUBE. Meyer's, for the absorption of carbon dioxide in barium hydroxide; as 
described in Standard Methods for Chemical Analysis of Plain Carbon Steel, adopted in 1914 
by the American Society for Testing Materials. Consists of a series of 10 small bulbs holding 
from in to 15 cc each, with large bulbs at the ends each having a capacity equal to that of the 
small bulbs combined •■••■« , 2.60 

122. ABSORPTION TUBE, Nesbitfs, for the absorption of carbon dioxide in soda lime in the deter- 
mination of carbon in iron and steel, designed by C. E. Nesbitt, chief chemist of the Carnegie 
Steel Company, Edgar Thomson Works. A slight turn of the stopper closes inlet and outlet 
tubes, scaling the bulb for weighing. The bulb filled weighs about 135 grams. Very rapid, 
enabling combustions to be run in 6 minutes. As many as 100 combustions may be run on a 
0.50 per cent, carbon steel with 1.5 gram samples without refilling , 3.50 

8 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. ABSORPTION TUBES 







No. 136. 



NoJ3& 



No. 1 24-. 



No. 123. 



No. 123A. 








No. 128. 



No. 130. 



124. 



No. 132. No. 134. 

123. ABSORPTION TUBE, Nesbitt's Improved, same as No. 122, but with inlet tube extended inside 

bulb and bent dow nward to diffuse gas through entire bottle $4 00 

123A. ABSORPTION TUBE, Stetser-Norton, as modified by J. B. Stetser and R." II.' Norton of "the Penn. 
Seaboard Steel Corporation from the original design by H. L. Frevert of the Midvale Steel Co. 
and used by them to replace the Vanier Bulb in the combustion method of determining carbon 
in steel. When filled with Asearite, a sodium hydroxide-asbestos mixture devised by Stetser 
and recommended for use with it, the bulb weighs about 100 grams and can be used for about 
40U determinations of a .50% carbon sb-el, using a one-half carbon factor sample. Height over 
all, 120 mm; diam eter at bottom, 45 mm. Complete with rubber stopper and capillarv tube 1.50 
ABSORPTION TUBE, Vanier's (pate nt. -.1), for the absorption of carbon dioxide in potassium 
hydroxide in determining carbon in steel by the combustion method. Designed by George P. 
Vanier, Chief Chemist of the Pennsylvania Steel Company. Consists of a potash bulb and dry- 
ing tube combined, capable of absorbing 100 combustions without refilling 6.00 

For other ABSORPTION TUBES AND BULBS, see Calcium Chloride Tubes; Potash Bulbs. 

ACID BASINS OR DISHES, see Dishes. 

ACID JARS, see Jars. 

ACID MEASURES FOR MILK, see Milk Testing Apparatus. 

ACID PITCHERS, of stoneware, with handle. 

Capacity, quarts 2 4 

Each . ". 60 1.20 

ACID PROOF FINISH, for chemical laboratory tables. While this preparation is not absolutely 

acid proof, it is a finish which has been successfully employed for years in many of the hading 

laboratories. Consists of two solutions with full directions for applying. The finished top will 

be black. One gallon will cover 300 square feet. Per gallon (V2 gallon of each solution) 2.50 

ACID PUMP, with force pump attached, for withdrawing acid from containers. Will fit any 

bottle or carboy having a neck from 1% to 2% inches diameter 9.00 

ACID PUMP for drawing acids and ammonia from carboys. Clamps hold it firmly to neck of 

c arboy. Can be operated by Air Pump No. 10980, or Foot Blower No. 1374 7.50 

136. ADAPTERS, curved, of light glass, lamp blown, bent at an angle of 45 degrees, for use with re- 
torts and condensers. 

No A B C 

Length, mm 150 180 200 

Inside diameter at large end, mm , is 2~> 30 

Each 20 .25 .30 

138. ADAPTERS, same as No. 136, but straight. 

No A B C 

Each 20 .25 .30 



12s. 



130. 



I.-.2. 



134. 



9 



AEROSCOPE 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 









I 





No. 142. 



No 152. 



No. 156 



Nos. 162-4. 



ennui 

HitNTiflC.CO- 



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3 



14L». 



146. 



147. 
150. 

152. 



r.6. 



15 7 
158. 

162. 



164. 





No. 146. 

AEROSCOPE. Standard, adopted by the American Public Health Association for obtaining bae- 

teria Prom air, according to the design of G. L. A. Ruehle, of the New York Agricultural Ex] 

ririu-iit Station. Consists <.f a tube, made of resistance glass to withstand sterilization, drawn 
down at the lower end to provide a shoulder for supporting a layer of cotton and Band. 
Length oi tube, 1 1 < • nun; diameter outside, 15 mm. Complete with selected cork stopper and 
bent tube. See Journal of Agricultural Research, Vol. IV, No. 4, for Julv, I'U.v >.. $0.50 

AGRICULTURAL APPARATUS, see Soil Aualysis Apparatus. 

AIR BATHS, mt Drying Ovens. 

AIR METERS, see Anemometers. 

AIR PUMPS. BLOWERS, see Blowers. 

AIR PUMPS for Vacuum and Pressure, see Filter Pumps; Pumps, Air. 

AIR PUMPS for Vacuum and Pressure. Bee Pumps, Air. 

AIR TESTER. Wolpert's <Carbacidometer>. Cor obtaining the amount of carbonic acid gas in a 
room by direct readings from the graduations etched on the glass, thus doing away with all 
computations and tables as in the old forms. Another advantage of this form is that the air 
of a room inav be secretly tested, if desired. Directions and full ael of capsules Cor making 
test solutions furnished with each instrument 4.50 

EXTRA CAPSULES for No. 146. In boxes of 1- capsules (six of each reagent) Per box .25 

AIR THERMOMETER TUBE, of glass, with stem 30 i m long. Diameter of bulb, 50 mm. 

15% discount in lots of 12. each 20 

AIR THERMOMETER TUBE. Same as No. 150, hut with eapillarv stem. Diameter of bulb, 50 
•»'i' 15% discount in lots of 12. each 35 

ALBUMINOMETERS, see Urine Analysis Apparatus. 

ALCOHOLOMETER. .-, , Hydrometers. 

ALKALIMETERS, see Carbon Dioxide Determination Apparatus. 

ALUNDUM CEMENT. COMBUSTION BOATS, CRUCIBLES. DISHES, FILTERS ETC see 
Cement. Combustion Boats. Crucibles, Etc. 

AMMETERS, see Electrical Instruments. 

AMMONIA ABSORPTION APPARATUS. Folin's, complete with Folia Absorption Tube cylin- 
der with rubber stopper, drying tube, and bottle. Height of cylinder, 15 inches: capacity of 
bottle, 4 ounces r 'xon 

AMMONIA ABSORPTION TUBE. Folin's. Tube only* of No". 156 fto 

CONNECTING TUBE, only of No. 156. Takes \... i' rubber stopper " 30 

For other FOLIN APPARATUS, see Blood Testing and Urine Analysis Apparatus! ' 

AMPOULES, of clear resistance glass, with flat bottom 

No A 

Capacity, cc i 

Per 100 ! ! ! !. 50 

AMPOULES, same as Xo. 162, but of amber glass 

No A 

Capacity, ec ] 

Per 100 [" 1 50 

20'; discount in lots of 1.000 from all sizes of Nos. 162 and~164 
AMPOULES with Rubber Stoppers, see Bottles, Serum. 

10 



B 


E 


K 


L 


2 


5 


10 


25 


1.50 


2.50 


4.20 


8.00 


B 


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K 


I. 


g 


5 


10 


25 


1.50 


2.50 


4.20 


8.00 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. ANAEROBIC CULTURE 




No. 168. 




No. 170. 




Buchner 
Tube. 



No. 172. 



ANAEROBIC CULTURE APPARATUS 

ANAEROBIC CULTURE APPARATUS, Buchner. This outfit consists simply of a large test 
till..-, for which our No. 1337 OD Pyrex tube will be found suitable, in which the alkaline pyro- 
gallol is placed, a simple support of wood or cotton on which is placed a small culture tube such 
as our No. 1336GB, and a solid rubber stopper No. 11 .".72 No. ">. The price of the parts will be 
found under their respective numbers. 

For a full discussion of Anaerobic methods, see Tanner's "Bacteriology and Mycology of 
Foods/ 1 I 'ages 17 to 23. 

168. ANAEROBIC CULTURE APPARATUS, designed by H. M. Jones, of the United States De- 
partment of Agriculture. Consists of an Alberene stone base 2 em thick and 12 cm square, 
with an annular groove to receive an inverted 100 mm Petri dish. The base is provided with 
outlet tubes so that gas and pyrogallate methods may be used. The groove may be scaled with 
paraffine or other wax. The small amount of air enclosed, about SO cc, permits rapid results 
to be secured, which are readily visible. (See Journal of Bacteriology, Vol. I, No. 3, for May 
1916, page 339.) $ 180 

170. ANAEROBIC CULTURE JAR, Novy's, for gas and pyrogallie acid methods, with removable 
top permitting Petri dishes to be used. The two sections can be clamped firmly together, .and 
are furnished with a rubber gasket in addition to ground flanges, making an air tight joint. 
Height of lower section, 100 mm; diameter, 140 mm. Complete with three metal clamps and 

U.-isket n - 00 

172. ANAEROBIC CULTURE APPARATUS, Smillie, especially designed by the author for the study 
of strict anaerobes such as B. botulinus. The method depends Upon the catalytic action of 
platinized asbestos upon oxygen and hydrogen when they are brought in contact. The ap- 
paratus consists of a heavy walled No. 80i54K Museum Jar, through the glass cover of which 
have been drilled two holes in which are inserted rubber stoppers carrying bent glass stop- 
cocks. One stop-cock has attached to its inner end a perforated glass bulb filled with plat- 
inized asbestos; to the end of the other is attached a piece of rubber tubing extending to 
the bottom of the jar. The cover is held in place by the usual clamp, a rubber gasket being 
used to make a gas tight joint. (For a complete description of the method, see Smillie 's ar- 
ticle in The Journal of Experimental Medicine, Vol. XXVI, No. 1, for July 1917, page 59, 
"New Anaerobic Methods." The same outfit will be found useful for cither gas, vacuum or 
pyrogallate methods, and is particularly valuable because of the number of petli dishes or 
tubes which may be placed in it. Diameter of jar inside, 6 inches; depth inside, 12 inches. 
Complete as illustrated 1150 

11 



ANEMOMETERS 



(i:\TR 



;tkaL BOEBNTIFK I O., CHICAGO, U. B. A 







No. lso. 





No. 181. 




No. 186, 



No. 188. 



L80. 



184. 



1 B6. 



iss 




ANEMOMETER, Biram's, -J inches in diameter, with four diala reading to 100,000 feet, keen- 
ratelj made and finely finished, with jewelled bearings. Complete with ecro setting attachment, 
in leather case si. r >.oo 

NEMOMETER or WIND GAGE, for indicati 
a vertical shaft, to the upper end of which 
hemispherical copper cup. Thesi cups turn 

umhI. Tin- rc-istcniiu ,ij a ] lv B0 divided as 

ion.... milrs. -Ml ,.;,,ts are interchangeable. Each instrument is standardized and fully war- 

rami a. weigat, .. ' _. Jus 42-50 

A S2t25f#S l S '" U " l " ,, "**! I '"" k in "''"' ,1 l '""" '• for ttse in ani,1,:l1 experiments. Small 
nee mutable for guinea pigs and rats; 1- !e f 01 cats and small dogs. 

length, mm .'..'.'.'.'.'.'. :\ t 1L 

Width, mm -" '"" 

Each 200 :•"" 

3.00 4.80 

A ^uriS KSSJ d r Si f nCd and c T struc,e ' 1 ' "ffofding humane conditions and entire 
examSation Tl, . !. 8tu,1 - v ! n B ' ? ni ! li:,,s undergo,,,, bacteriological or microscopical 

and permS'the em, Z^f " the h ° U ° m rcnders ""' ' h " W '' :ir " '"' "'" Mi»«H W. 

12 









CENTBAL SCIENTIFIC CO., CHICAGO, U. S. A 



ANIMAL CAGES 







192. 



I'M. 



ll'o. 



201). 



204. 



206. 



214. 



215. 

216. 

218. 
220, 



No. 214. N - 220 - L 

ANIMAL CAGE, Heim, with two compartments, for breeding mice and other small rodents. 
Made of wood, lined with galvanized iron, with shelf for food, runway of wire cloth and re- 
movable drawers. Dimensions, 20 x 12 x 12 inches $22.00 

ANIMAL CAGE, Vaughan's, collapsible, rendering it easy to sterilize. SioVs, b ttom, and top 
come apart so that it can be packed away in small space. Height of cage, 12 inches; length, 
20 inches; width, 15 inches; height over all, 17 inches 13.50 

ANIMAL CAGE, Mouse Jar, of glass, 5 inches in diameter by 7 inches high, with wire gauze top 
loaded with a heaw cast iron knob 2.00 

ANIMALCULAE CAGES, see Projection Apparatus. 

For INSECT CAGES, see Nos. 8000 and 8004. 

ANIMAL HOLDER, of metal, for inoculating mice, with adjustable clamp for holding the tad. 

(.'age may be removed from base. The top is slotted to permit abdominal inoculation when 

animal is held on its back % 5 - 00 

ANIMAL HOLDERS, Voge Guinea Pig Holders, for inoculation, measurement of temperature, 
etc. Consists of a slotted cylinder of j>olished zinc with perforated base. 

No A B 

Height, mm..... ™ 2 °0 

Diameter, mm m •? . gjj 

Each . ^ 1/75 

ANIMAL TAGS, of aluminum, with hole and staple for attachment to ears of rabbits, -logs, etc. 

Numbered consecutively in series of hundreds Per hundred 3.20 

Note:— In ordering, specify the series of numbers desired. 

ANNEALING CUPS, of selected clay. Used extensively for silica fusions. 

N() 1 2 

Size "inches • l%xl% 1% x 1% 1% x 1% 

Per 'dozen..'.: 2.50 2.50 2.50 

ANNEALING CUP COVERS. 

For cups No 1 * 

Per dozen .■■•• - 75 _ - 75 _ - 75 

ANNEALING CUP, Coors Porcelain, glazed throughout with exception of outside bottom sur- 
face Diameter at top, 38 mm; diameter at bottom, 27 mm; height 25 mm; capacity, 15 cc .22 
ANVIL Plattner's, of case-hardened steel, for blowpipe analysis. Dimensions, L%xl%xVs >"• 

70 

ANVILS, Regular Shape, steel face. 

No £. J* 

Weight in pounds 1D '™ 

Etcf\ in .!!! h ^!^ 55 ° ™<*> 

13 



•«* 



APRONS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. s. A. 



No. 236. 
No. 240. 




No. 238. 
No. 242. 






Nos. 252-4. 



No. 260. 




l'.-.s. 
240. 

242. 

\1 .'.I'. 



254. 



•Ji-.n 



APRONS, OVERSLEEVES AND LABORATORY COATS 

APRON, light weight, of pure black rubber cloth, acid and waterproof, very flexible, accommo- 
dating itself easily to any position of the body. Length, 46 inches S0.60 

10% discount in" lots of 12. 

OVERSLEEVES, of same material as N.». 236 Apron, with elastic bands at top and bottom .35 

10'; discount in lots of 12. 

APRON, of pure white rubber cloth, especially suitable for use in bacteriological, biological and 

hospital laboratories. Length, 46 inches 1.20 

10% discount in lots of 12. 

OVERSLEEVES, of same material as No. 240 Apron, with elastic bands at t • • i • and l>«>ttom. Per 

Pair 60 

10'.;. discount in lots of 12. 

LABORATORY COAT, of white drill, affording complete protection to the clothing. Widely used 
in bacteriological, biological, food and dour laboratories. Buttons are easilv rcnmvaldo for 
laundering ; with three pockets and adjustable strap in back. Length, ~>4 inches. In ordering 
give chest measure taken loose fitting 3.00 

LABORATORY COAT, of tan covert cloth, with three pockets, ride slits, removable buttons, 
and sleeves buttoning close to wrist. Length, 50 inches. In ordering, give chest measure 
taken loose fitting ^ 50 

DISSECTING OR OPERATING GOWN, long sleeved, of white drill', with one pockeV and straps 
for fastening at neck and waist. Especially suitable for bacteriological and anatomical lab 
oratories. Length, 52 inches, (fan be furnished in 58 inch length if desired.) In ordering 
give chest measure taken loose fitting 31 




274. AQUARIA, steel frame, slate bottom, heavy 
glass sides; well made and nicely finished. 
The measurements in the table below are 
in iiu lies over all. 



No A B 

Length, inches... 12% 16% 

Width, inches ... 7 9 

Height, inches ... 10 11 

Capacity, gallons. 3 6 

Each 7.00 9.00 



I) 

13 
13 

1L' 
12.50 



No. 274. 



14 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



AQUARIA 




No. 8012. 




No. 286, 



No.304. 







\ 



No.394. 





B 

No.302. 




N0.3O6. 



JJ 




No. 300. 



8042. 



L'sfi. 



AQUARIA, Battery Jars, of clear white glass, with ground rim. 

No A 

Diameter, mm 100 

Height, mm 100 

Each $0.70 

AQUARIA, Round, <.f whit.- -I;i — , with reinforci'd rim. 

No 

Diameter, about, mm 

Height, about, mm 

Approximate capacity, liters 

Each • 



B 


C 


D 


E 


100 


125 


150 


225 


125 


175 


200 


300 


.90 


1.20 


1.70 


4.00 


A 


B 


C 


D 


175 


225 


250 


300 


175 


225 


250 


300 


4 


8 


12 


20 


2.20 


3.30 


5.50 


7.50 
1.40 



294. ARSENIC APPARATUS, Gutzeit-Bragg, with ground joints 

:i(iii. ARSENIC PLATE (Streak Plate), of unglazcd porcelain for arsenic tests, 60x100x4 mm thick .48 



302. ARSENIC TUBES, of hard glass. 

Style 

Each 

20% discount in lots of 100. 



A 
.10 



B 

.10 



304. ARSENIC TUBE, of combustion tubing, with constriction. Length, 15 inches 



.60 



306. ARSENIC TUBE, of transparent silica. Length over all, 6 inches; length of constriction, 3 in. 
May be used repeatedly 120 



15 



ASBESTOS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 







No. 308. 



No. 312. 



No. 322. 





No. 316, 



No. 318 



308. 



312. 



314 

316. 



313, 
320. 



OOO 



ASBESTOS MATERIAL 

ASBESTOS CEMENT (Retort Cement), fire and acid proof, for use with muffles, retorts, 
electric furiuo BS, etc. Put up in cans ready for use. 

Weight, [hiu mis l 

Each §0.50 

ASBESTOS CORD or TWINE, in % pound 1-alls. 

No 

Diameter, inches 

Per ball 



5 

1.33 



A 

Vii 

1.00 



'l, 



B 

1.00 



ASBESTOS FIBER, or WOOL, see Chemical Catalog. 
ASBESTOS GLOVES AND MITTENS, see Gloves. 

ASBESTOS PAPER for filtering acids, in rolls 36 inches wide, weighing about 1.3 pounds to the 
square yard. Thickness, about 0.028 inch Per lb. .25 

ASBESTOS PADS. Vs inch thick, with iron bound edges; for protecting table tops, etc 

N " A B D 

Dimensions, inches 8*£x8y> 11x11 10x16 

Eac h .35 ' .55 .60 

ASBESTOS PLATE or PAD, round, with iron hound edges and ring for Buspension. Diameter 
8 inches 

ASBESTOS SHEET. |n X 40 inches, fire and acid proof. 

Thirkiicss, in. lies 1/ 

Weight per sheet, lbs 2 

Per square foot 10 

Per sheet 60 

ASBESTOS SHEETS, square, 1 , n inch in thickness. 

No 

Dimensions, inches 

Per dozen 



V, 
4 

.15 
.90 



J s 

8 

.45 
2.85 



A 
.30 



5x5 



.10 

y+ 

14 
.85 
5.10 

B 

6x6 

.40 



324A. 
324C. 
326. 



20% discount in lots of 144. 

ASBESTOS SLATE, Transite. arid proof, for protecting table tops, building apparatus, etc. 

The best laboratory material for heat and electrical insulation. I Ian be cut with ordinary saw 

Thu-knoss, ,n % , ]t . 1( % - ■ ■ 

ASBESTOS SLATE, 42x48 in Per sheet 4.40 7.00 7.80 11.00 

ASBESTOS SLATE Per sq. ft. .35 .65 .75 1.05 

ASBESTOS SLATE SQUARE, I2xl2x% in. Superior to an asbestos pad 40 

16 



1... 
14.50 
1.50 



-• HI 


• CE 


1 


1 


t 


\ 


1 




\ 


1 




1 


FE 


v-i FE 


339. CE 


t 


1 


1 


Ft 


34n CI 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



ASPHALT 





No. 332A. 



No. 338. 




No. 339, 



APPARATUS FOR TESTING ASPHALT, CREOSOTE OIL, 

PITCH AND COAL TAR, 

332A.BALL AND RING APPARATUS, American Society for Testing Materials type, for the deter- 
mination of softening points of bituminous materials other than tar products. The appar- 
atus consists of a 600 cc Pyrex g'jss beaker, a brass ring % inch Inside diameter ami V 4 inch 
deep! with % 2 i" c h walls, and with brass wire handle attached; a steel ball % inch in diameter 
weighing between 3.45 and 3.55 grams; a standard thermometer reading from 0° to £0° C. in 
%° divisions; an 1 a rubber stopper and clamp for supporting the thermometer and ring. Com- 
plete with directions for use. (See A. 8. T. M. Standard Specifications for 1921, No. D36-21.) 
$12.00 

Note: Unless otherwise specified the thermometer with ran^e from 0° to 80° C. will be furnished 
with the apparatus. For Bituminous Materials having softening points above 80° C, specify No. 13587 Ther- 
mometer with range from 30° to 160° ('. in Jfc* divisions. 

L3586. THERMOMETER, only for Xo. 332A, solid stem, engraved scale, graduated from 0° to 80° C. in 
l /o° divisions , 8.00 

13587. THERMOMETER, solid stem, engraved scale, graduated from 30° to 160° C. in %° divisions, for 
melting points of bituminous materials having softening point! above 80° C 5.00 

335. RAILS, only for Xo. 332A each .20 

per dozen 2.00 

336. RING, with wire handle attached for Xo. 332A 1.75 

338. CENTRIFVGAL EXTRACTOR, Dulin Rotarex, No. 1, Motor Driven, capacity 50 grams, for the 
extraction of bituminous aggregates. \V : 11 give complete extraction in ten minutes. The 
large size sample insures greater accuracy in the analysis of coarse aggregates and will also ex- 
traet enough bitumen to be used for tests on the asphalt ie cement. Consists essentially of a 110 
volt A. C. or D. C, motor mounted vertically on a cast iron base, directly connected to the alu- 
minum extraction bowl. The bowl is surrounded by a cylindrical aluminum shell, shaped to 
drain through a spout at the side. The solvent is introduced into the extraction bowl through 
the funnel shaped screw which holds the filter ring and cover in place. The outer cover is made 
in two pieces so that the section immediately over the funnel may be removed when the solvent 
is added. Complete with rheostat, eord with plug for attaching to lamp socket, and directions 

for operating. (See Bulletin Xo. 314 of the U. S. Bureau of Public Roads) 95.00 

Note: The above machine may Le obtained with 100 gram bowl at a slightly increased price. 

338D. FILTER RINGS, only for 50 gram Bowl per 100 2.25 

338H. FILTER RINGS, only for 100 gram Bowl per 100 2.75 

339. CENTRIFUGAL EXTRACTOR, Dulin Rotarex, Hand Power, capacity 50 grams, designed to meet 

the requirements for an extractor for field work. Similar in design to the motor driven ma- 
chines, except that it is driven by a hand crank through a set of hand-fitted machine-cut gears 
so that a high speed can be maintained without vibration. 

Note: The above machine may le obtained with 100 gram bowl at a slightly increased price. 
FILTER RINGS for No. 339, see Xo. 338D. 

340. CENTRIFUGAL EXTRACTOR, Dulin Rotarex No. 2, Motor Driven, capacity 1000 grams, with 

• lirect drive vertical type motor for 110 volts A. C t or D. G\, enclosed in cast iron frame. Com- 
plete with rheostat, cord with plug for attaching to lamp socket, and directions for operating. 
185.00 

340D. FILTER RINGS, only for 1000 gram Bowl per 100 5.50 

17 



CENTRAL s« IKNTIKIC CO., CHICAGO, U. S. A 





No. 344. 



•: •-- 



No, 3414. 











Vf 




No. 346. 




No. 357. 



No. 35b. 



No. 348. 






344. COKE BULB, Pyrex glass, ns adopt* d by thhe American Society for Testing Materials, for eok ■ 
test of asphalt, pitch and creosofc oils. See A. 8. T. M. Specifications tor 1921, No. D3s 18) 

$0.20 

3414. CRUCIBLE. Gooch, Coors porcelain, of special form with large filter! . - surface for Determining 
Bitumen Soluble in Carbon Bisulphide. Height, 24 mm; outside diameter at bottom, 35 mm; 
outside diameter at top, 45 mm; capacity, 30 cc. Bei Specifications of the A. s T M for 
1921, No. D4-11) 60 

346. CUPS OR SAMPLE BOXES. f..r asphalt, of tin plate, as recommended by the American Society 
for Testing Materials, in Standards for L921, No. D6-20,page 732. Diameter about -'••,,■ inch) 

depth, about l :i s inches per dozen .60 

348. DEHYDRATING APPARATUS, for Dehydrating Tars, and other Bituminous Materials, and for 
the analysis of Water in Creosote Oils and Bituminous Materials according to the Standards 
of the American Society for Testing Materials. Consists ,,i a cylindrical copper still 15.8 cm 
high an. 1 .».". ,-m in diameter, supported on an iron stand an. I fitted with a lid provided with 
clamp and thumbscrew. The condenser consists of a copper jacket 38.75 cm long with inner 
glass condenser tube set at an angle of 75°. A special combined separatory funnel and burette 
is furnished, with a capacity of 120 cc with outlet tube graduated in i : , cc divisions. Complete 
as illustrated, with copper still, connecting tube, ring burner of brass, condenser box, 
glass condenser tube, separatory funnel, supports and clamps, but without thermometer (8 
A. S. T. M. Specifications for 1921, Xo. D3S-18, page 808; A. S. T. M. Tentative Specifications 
for 1921, Xo. D114-21T; and Bulletin 314 of the U. S. Bureau of Public Boads) ...!.... 38.50 

13626. THERMOMETER for Xo. 348, graduated from 0° to 400' C. in 1° divisions according to the re 
quirenients of the American Society for Testing Materials 7.00 

Extra Parts for No. 348. 

351. COPPER STILL, with cover, clamp and thumb screw, with tubulature for connecting tube and 

with 6 paper gaskets. Height inside 15 cm; diameter s.7 en. " 20 00 

352. RING BURNER, of brass, for use with Xo. 351 * 2 .50 

353. CONNECTING TUBE, of glass, with side aim 3b 

354. CONDENSER, of copper, on support, with inner condenser tube s.qo 

355. INNER CONDENSER TUBE, for Xo. 354, of glass, about 61 1 cm long 40 

356. SEPARATORY PUNNEL, with stopcock, capacity 120 ec, with outlet tube graduated in U cc 

divisions ', r-r, 

4.50 

357. DISH, Evaporating, for use in evaporation test, of pure nickel, with flange and handle 2.10 

18 



» iff! PEMTM 



CENTRAL 8CIENTIPIC CO., CHICAGO, U. S. A, 



ASPHALT 



i 




No. 358. 




No. 360. 



No. 366. 



No. 368. 



No. 370 



358. DISTILLATION APPARATUS, for Tars, American Society for Testing Materials Type, consisting 
of a 250 cc Pyrex Engler flask supported on a ring stand and surrounded by a metal shield with 
sight hole. The side arm is connected by a rubber stopper to a special type of condenser. 
Complete with flask, shield, condenser, 25 cc graduate, support stand, two clamps and 4 inch 
ring, but without burner or thermometer. (See A. S. T. M. Standard Specifications for 1921, 
No. D2*>-18, for the "Distillation of Bituminous Materials Suitable for Koad Treatment"; and 

Bulletin 314 of the U. S. Bureau of Public Roads) $8.50 

5621. FLASK, only for No. 358, Pyrex glass, actual capacity 250 cc, rated capacity 200 cc 65 

THERMOMETER for No. 358, see No. 1362<>. 
360. DRYING OVEN, New York Testing Laboratory Type, of Russia iron, double walled, covered 
with asbestos. The heat is supplied by a 10 inch ring burner immediately beneath the air 
space between the two walls. The interior of the oven is provided with a perforated shelf, 
beneath which is a fan for insuring even temperature. The door is hinged and provided with 
openings for thermometer, thermoregulatory etc. Height, 20 inches; diameter, 11 inches. With- 
out thermometer and thermoregulator. (See American Society for Testing Materials Standards 

for 1921, No. D6-20 for 4 ' Loss on Heating of Oil and Asphaltic Compounds. ") 36.00 

13512. THERMOMETER, only for No. 360, solid stem, engraved scale, graduated from 150° to 175° C. in 

1° divisions. Length, about 6 inches; scaled for total immersion 5.00 

9830B. DRYING OVEN, DeKhotinsky, Electrically Heated and Regulated, used for the test for loss on 
heating of oil and asphaltic compounds, constructed to produce such a uniform temperature 
of (living space as to preclude the necessity for a rotating shelf. For details of construction 
and price see No. 9830B under general heading Ovens, Drying. 
366. EXTRACTION APPARATUS, American Society for Testing Materials type, for matter insoluble 
in benzol in analysis of creosote oil and for free carbon in tars and pitches. Consists of a 
flask of special form, and wire support for filter cup. (See A. S. T. M t Standard Specifications 
for 1921, No. D38-18, page 808, "Sampling and Analysis of Creosote Oil"; and Journal of 
Industrial and Engineering Chemistry, Vol. VI, No. 4, for April 1914, page 279, M Five Carbon 

Determination in Tars and Pitches") 4.15 

366A. FLASK, only, of No. 366 1.00 

3G6B. WIRE SUPPORT, only, of No. 366 .80 

366C. CONDENSER, only, of No. 366, of block tin with cover attached 2.35 

3G6D. ALUNDUM THIMBLES for No. 366, of RA98 porous alundum, height 88 mm; diameter, 30 

mm ; with tlat bottom * . . . .75 

368. EXTRACTION APPARATUS, New York Testing Laboratory Type, for the extraction of bi- 
tuminous material from paving mixtures containing broken stone. Consists of a metal cylin- 
der, inside which fits a second cylindrical metal vessel which holds the solvent. A wire 
basket holding 500 grams of the disintegrated paving material is suspended in the inner 
vessel, and an inverted conical condenser provided with outlets for water circulation is 
placed in the top. The heat is supplied by a 16 C. P. incandescent lamp, mounted on the 
wooden base and projecting into the bottom of the outer cylinder. With 175 to 200 cc of 
carbon disulphide, ;100 grams of sample should extract clean in three hours. Complete, with- 
out lamp bulb 55.00 

370. FLASH POINT TESTER, Elliott or New York State Board of Health Type, as modified by the 
Underwriters Laboratories, with Bunsen burner and with Thermometer No. 13444A, graduated 

from 200° to 750° F 10.00 

For other Flash Point Testers, 9ee Oil Testing Section. 

19 



ASPHALT 



i IENTB 



M. SCIENTIFIC CO., CHICAGO, V- B. A. 





374 



382. 

383. 

9894. 
384. 



388. 



illMHIIf 




lilt- ' 






; ! : j 








\s* — 










. 








■— *i 


1 






1 



(f> 




No. 384. 




No. 381 




NO. 382. 





it- 



No. 374. 

FREEZING APPARATUS, designed by Pn-vost Hubbard of t li. - United States Bureau of Public 
Reads, I'm determining the percentage of , Lraffine scale in bituminous materials. Consists of 
an inverted bell jar surrounded by a cov< r of felt. A copper jacket is held in the neck of the 
bell jar by a rubber stopfer. A glass filter tube wrapped with blotting paper fits inside the 
copper jacket, and extends through the rubber stopper which fits into the 500 cc filter flask. 
Complete with support stand, clamps, bell jar, two 500 cc filter flasks, rubber stopper etc. as 
illustrated, but without thermometer. Hull-tin No. 314, of the U. S. Bureau of Public 

Bpads) $14.00 

HYDROMETERS, see general heading Hydrometers. 

HOT PLATES, Electric or Gas, see under general heading Hot Plates. 

MOLD, Asphalt Briquette, American Society for Testing Materials Type, of brass, with remov- 
able center pieces, for use in the test for ductility of bituminous materials. (See A S T M 
Tentative Sp«-eini-ations for 1921, No. D11:;-21T) 7. 50 

MOLD, Cube, of brass, for one-half inch cubes, with iron clamp. For use in molding cubes for 
the cube-in-water method for melting point of bituminous road materials. (See Bulletin 314 
■ if the U. S. Bureau of Publie Roads) g 00 

MOLD, Cube, American Society for Testing Materials Type, ,,,- brass, for one-half inch cubes, 
with iron clamp. For use in molding cubes for the cube-in-water method for softening point 
of t ar products. (See A. 8. T. M. Specifications for 1921, No. D61-20) , 5,25 

OVEN. Drying, Single Wall, of copper covered throughout with asbestos, as used in tar and 
pitc h testing. Si/.e, KxluxS inches mm 30 00 

OVEN, Melting Point, or Air Bath, Barrett Type, for the determination of the" meiting point of 
tar. Consists of a copper cylinder with observation window of mica. Inner vessel of copper 
can be removed for cleaning 10 00 

OVENS, Drying and Constant Temperature, see under genera] heading Ovens. 




imen. (For lull desenptaon, see Hiehardson "The Modem Asphalt Pavement." page 565- 
"Standard Method of Test for Penetration of Bituminous Materials," see A Vt M* 
afication for 1921, No. D5-21) ' innnn 



specim 
for 

Specifica ti 



01 
391. 



20 



CENTBAL SCIENTIFIC CO., CHICAGO, U. S. A. 



ASPHALT 




.390. 
391. 



394. 



Nos. 394, 5 and 6 assembled. 



No. 11478. 



395. 
396. 

11478. 



397. 
398. 



172G. 



1734. 



PENETROMETER, Miniature, for portable work, about half the size of the standard instrument. 
Combined weight of chuck ami needle, 100 grams. Without clockwork $50.00 

PENETRATION NEEDLE, American Society for Testing Materials Type, originally designed 
by Charles S. Reeve and Fred P. Pritcbard of the Bureau of Public Roads of the United States 
Department of Agriculture and modified by the American Societv for Testing Materials iu co- 
operation with the Bureau of Public Roads. This needle gives "the same results as the old 
standard No. 2 Cambric needle, and possesses the advantage that it can be exactly duplicated 
and accurately described. With brass ferrule to facilitate holding in the ehucks*of standard 
penetrometers. (See A. S. T. M. Standard Specifications for 1921, No. D5-21; and Bulletin 
314 of the U. S. Bureau of Public Roads) 1.00 

RETORT, Tubulated, of Pyrex Glass, American Society for Testing Materials Type, for the Dis- 
tillation of Creosote Oil. Capacity about 1J30 cc; length of condenser tube, about 30 cm. (See 
A. S. T. M. Standard Specifications for 1921. No. D38-18 for "Sampling and Analysis of Creo- 
sote Oil") :.. • '..... 1.90 

THERMOMETER lor No. 394, see No. 1362G. 

CONDENSER, glass tube, for use with No. 394. Length about 36 cm 45 

SHIELD, galvanized iron covered with asbestos, for use with No. 394, for protection from air 
currents 3.00 

RETORT, Iron, for the distillation of bituminous materials in preparation for determination of 
paraffine scale by the " freezing-out ' ' method. The 250 cc retort is recommended for standard 
tests. (See Bulletin Xo. 314 of the U. S. Bureau of Public Roads.) Also used in the test for 
moisture in creosoted wood block in connection with No. 356 separatory funnel. (See Hub- 
bard 's ' ' Highway Inspectors ' Handbook ' '.) 

Capacity, cc. / 250 500 1000 2000 

Each 3.80 4.50 5.00 6.00 

SIEVES, for the grading of Mineral Aggregate, see No. 12124 under general heading Sieves. 

SLIDE BOX, Barrett Type, of copper with six corrugations, for slide test of pitch 5.00 

SPECIFIC GRAVITY PAN, American Society for Testing Materials Type, of nickel, for deter- 
mining the specific gravity of solid and semi solid fractions of creosote oil. Diameter of top, 
2.5 cm; depth, 1.2 cm. With hook for attaching to balance. (See A. S. T. M. Standard Speci- 
fications for 1921, No. D38-18, "Sampling and Analysis of Creosote Oil") 1.25 

BOTTLE, Specific Gravity, Barrett Type, 50 ee capacity, for specific gravity of tar and pitch. 
(See Journal of Industrial <& Engineering Chemistrv, Vol. V, No. 3, for March 1913, page 19")) 
". 1.60 

BOTTLE, Specific Gravity, Hubbard, for fluid and semi-solid bitumen, designed by Prevost 
Hubbard of the Office of Public Roads. Consists of a heavy tube 70 mm long and 22 mm in- 
side diameter, with accurately ground stopper made concave on under side. A hob' 1.(1 mm in 
diameter passes through stopper and connects with this hollow space, permitting nir to escape 
easilv. Capacitv, about 24 cc; weight empty, about 28 grams. (See Bulletin 314 of the U. S. 
Bureau of Public Roads and A. S. T. M. Tentative Specifications for 1921, No. D70-20T) 1.50 

21 



ASPHALT 



OENTBAL SCIENTIFIC CO., cni<'.\<;<>, r s. A. 




No. 406. 








No 404. 



NO, 14300 



fe 




No. 400. 



Kin. 



400A 
4U1. 



VISCOSIMETER, Eugler, for viscosity deteitnination of bituminous materials, see under general 

heading Viscosimeters. 
VISCOSIMETER OR FLOAT TESTER. American Society for Testing Materials Type, for the 
viscosity or Hoat tesl of bituminous binders including < nosote oil residues. Consists of a con- 
cave aluminum il«>at, 3 ' _• inches inside diameter, and a brass collar which screws into tin* ltasr 
of tin- iloat. Complete with two extra brass collars. (See A. S. T. M, Standard Speci£cations 

for 1921. No. D33-18) $9.50 

COLLARS, only of No. 400, of brass each 2.00 

PLATE. Brass. .'\s r „ u for us.- in filling the brass collar of No. 400 56 

WATER BATH, DeKhotinsky, Electrically Heated and Regulated, for use in maintaining a con 
st ant temperature in the penetration and ductility tests of bituminous materials ; also for 
use in any other laboratory work where constant temperature is necessary. It consists of a 
copper container, heavily nickel-plated inside and out, la;:::* >\ with magnesia-asbestos, and pro- 
tected outside by a sheet of Russia iron The bath is attached to an enameled cast-iron base 
ami supplied with three nickel-plated roils, to which may be attached laboratory clamps for 
supporting flasks, etc. Each bath is fitted with four electric heating units, three of which 
may conveniently be added one by one, by means of the switch constituting part of the bath. 
The fourth unit is electrically connected to the relay, which is automatically operated l>v a 
thermoregulatory A constant water level attachment is furnish, .I with each bath, by means of 
which the water level can be regulated. The bath has a very good natural circulation as heat 
is supplied inside the bath 2") mm from the bottom. When experiments or tests require a more 
vigorous circulation and regulation closer than 1/10° C, a small High Speed Turbine stirrer 
No. 12864 can be attached to the bath. Complete with four heating units, relav, therm.. emu- 
lator, constant water-level device, support rods, five feet of cord and attachment plug, but with- 
out stirrer. (For more complete description see No. 14300 under general beading Water Baths.) 



14300. 
14301. 

L4302. 

l i:tu:v 



No. 

Capacity, liters 

Available height inside, cm 

Diameter inside, cm 

For 110 volts A. C 

For 220 volts A. C 125 00 

For 110 volts D. C ... . . 125 00 

125^00 



A 
9.3 
25.0 
19. 
125.00 



B 

18.2.") 
30..") 






135.00 
135.00 
135.00 
135.00 



404. 

406. 



For 220 volts D. C 

Note:— In ordering Btate mean temperature desired bo that beating units of corn . t wattage ~rna\ 

In- l urnixhed. 

"WATER BATHS, steam or gas heated, sec under general heading Water Baths. 

ATOM MODELS, sop Models. " 

AUGER BITS, set of 13 high grade bits in hardwood case; V* to 1 inch by sixteenths of an inch. 

AUGER BIT, Clark's adjustable expansion bit, cutting from" % inch to 1% inches". ".'.". .".".*. 2.00 

22 







W8A. 
HUA. 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A, 



AUTOCLAVES 




Nos. 408A-410A. 



408A. 
409 A. 
410A. 



AUTOCLAVES, Steam Pressure Sterilizers, horizontal form, double wall, for rapid sterilization 
of dressings, laboratory apparatus or culture media. Constructed of heavy polished copper with 
double wall and with detachable steam generator, which eliminates any danger of burning out 
the sterilizer should the water be entirely used up. Mounted on a substantial iron stand 
which can be permanently fastened to the floor. The circular door, made of solid cast brass, 
is quickly and easily opened, rolling back on a track inside the sterilizer. The door and head 
are perfectly ground and fitted, requiring no packing or gaskets to make a steam tight joint. 
Xo clamps or springs are required to hold the door shut, as it cannot be opened if the least 
steam pressure remains in the chamber, thus eliminating the danger of scalding. The steam 
enters, circulates around the inner jacket and is then admitted to the inner chamber through 
an automatic valve, the air being expelled through an air cock. The safety valve is set to 
relieve at 15 pounds pressure, at which pressure a temperature of 249° F. is obtained. At pres- 
sures of from 10 to L5 pounds, giving the corresponding temperatures of from 240° F. to 
249° F., the most difficultly sterilized material is rendered completely sterile within 15 
minutes. The autoclave may be used as a free steam sterilizer by leaving the air 
cock open, thus insuring a temperature of 212° F. inside of the inner chamber* The double 
wall sterilizer is recommended for all types of sterilizing such as bandages, dressings, instru- 
ments, laboratory utensils or culture media. If a sterilizer is required for sterilizing labora- 
tory apparatus and culture media only, the double wall feature is not necessary. Single wall 
sterilizers, of the same construction, can be supplied at 15 per cent, less than the double wall. 

AUTOCLAVES, double wall, complete as described with inner shelf, water gauge, safety valve, 

steam gage and steam generator; finished in burnished copper with brass fittings and sub- 
stantial iron stand. 

No OB IB 2B 3B 4B 

Length inside, inches 16 20 24 28 28 

Diameter inside, inches 12 16 20 22 25 

Diameter of door, inches 8 10 12 14 16 

Arranged for steam heat $180.00 220.00 262.00 313.00 416.00 

Arranged for gas lieat 180.00 220.00 262.00 313.00 416.00 

Arranged for electric heat 208.00 254.00 305.00 364.00 467.00 

Nickel-plated finish can be supplied, if desired, at an additional cost. Quotations will be made 
upon application. 

In ordering for electric heat, kindly state voltage and kind of current 

23 



AUTOCLAVES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. B. A 






Nos. 412 415. 



No. 419F. 



No. 420. 















AUTOCLAVES, Steam Pressure Sterilizers, horizontal form, single wall, for the rapid steriliza- 
tion of laboratory apparatus! culture media and solutions. The sterilizing chamber, cylin- 
drical in form, is made of heavy sheet copper, enclosed by an efficient heat insulating covering 
hold in place by a copper finishing jacket. Tin- door is fitted with an automatic stop which 
guards against its being opened while there is steam pressure in the chamber. Articles to be 
sterilized are placed within the chamber, the door locked, and the steam turned ou with the 
exhaust open until the steam has displaced all the air in the chamber, when the exhaust is 
closed. Steam pressure up to 15 pounds may then be maintained for the desired period; eight 
to ten minutes at IS pounds pressure are considered ample. Materials employed throughout 
are the highesl grade bronze, brass and copper. The interior of the chambei is carefully tinned 
and the exterior of the sterilizer is heavily nickel-plated and highly polished. The door, door 
frame and back end are finished in hand rubbed ebony enamel. Complete as described with 
safety valvCj pressure gage, independent high power steam generator ami all necessary oper- 
ating valves; mounted on a white enameled tubular steel stand, fitted with cast brass floor 
jdates. 

No B C D E F 

Length, inches 21 22 24 26 30 

Diameter, inches 11 14 16 18 L'- 

412. Arranged for steam heat §189.00 225.00 270.00 3X5-00 418.50 

413. Arranged for gas heat 211.50 247.50 292.50 342.00 450.00 

11.1 * Arranged for electric heat. 234.00 270.00 315.00 360.00 495.00 

In ordering for electric heat, kindly state voltage and kind of current. 

419F. AUTOCLAVE, High Pressure, Copper Chamber, suitable for making digestions under pressures up 
to 50 atmospheres. The chamber of 3 liters capacity is made of copper, fitted with a heavy 
brass cover equipped with a pressure gage, thermometer well and safety valve with sliding 
weight. A heavy iron horseshoe clamp with a central pressure screw is provided for tightly clamp- 
ing the cover in place. The copper body is supported by an iron shield with three heavy iron 
legs. Inside dimensions 150 mm by 200 mm. Complete with three wrenches 180.00 

420. AUTOCLAVES, High Pressure, Steel Chamber, for digestion under steam pressures up to 1000 
pounds per square inch. Consists of a chamber of seamless drawn steel with &i tt inch wall, to 
which is threaded and welded a heavy east iron collar. A cap of the same material is accu- 
rately fitted with a packing joint and clamped to the collar by means of six heavy steel stud- 
bolts. The cap is equipped with a pressure gage, a blow-off valve for releasing confined 
gases when desired, a low pressure safety valve, which, when set, releases the pressure at 250 
pounds per square inch, a high pressure safety valve for pressures over 250 pounds per square 
inch, and a thermometer well sunk to within one inch of the bottom of the chamber. The auto 
claves are tested hydraulically to 1000 pounds per square inch. A polished steel jacket mounted 

24 



K8, 



CENTRAL SCIENTIFIC CO.. CHICAGO. U. S. A. 



AUTOCLAVES 






No. 421. 



No. 422. 



No. 429. 



421. 



422. 



428. 

42!». 



AUTOCLAVES, High Pressure, Steel Chamber, Continued. 

on a heavy < :ist iron base supports the digestion chamber in the proper position for heating 
with a high power gas burner. Complete as described, with burner but without thermometer. 

No A B C 

Diameter inside, inches C 8 10 

Depth inside, inches 12 12 12 

Each $208.00 240.00 292.00 

Gas Regulator, for controlling temperature and pressure of No. 420 autoclaves. By means of 
this device, designed to screw into cap, the gas flow is automatically controlled to maintain 
any desired temperature or pressure. Provided with a special attachment for keeping burner 
lighted when gas flow is reduced to very low pressure 14.00 

AUTOCLAVES, Pressure Cookers, of cast alumium, very useful for sterilization or digestion un- 
der moderate pressure. Extensively used in domestic science laboratories for cooking under 
pressure. Can be used over any laboratory burner. Complete with pressure gage reading to 
30 pounds, safety valve, petcock, and attachment for thermometer. 

No A B C 

Diameter at top, inches 8 9M» 10% 

Greatest diameter, inches 10 11% l-*& 

Depth, inches . . 10 12 14 

Capacity, quarts 10 17 -•• 

Weight" pounds 8% 14% 21 

Shipping weight, pounds 1^ *!?«,«. 

Each s .... 19-00 26.00 33.00 

AUTOCLAVES, Pressure Sterilizers, single wall, made of steel boiler [date, riveted and calked 
at the scams, with heavy flange. The cover is of semi-steel with sanitary packing and thumb 
screw clamps to hold firmly in place, and :s provided with handles. The equipment includes 
polished .-upper rack tinned inside to bold articles to be sterilized, platform for rack, safety 
valve, steam -age, steam circulating device, thumb-nut wrench, and cover lifting device (on 
two larger sizes). Finished in aluminum bronze. 

No -A- B ^ 

Tested for pressure, pounds 30 50 50 

Depth of chamber, inches 18 -' 

Diameter of chamber, inches M \° g 

Height over all, inches 39% 40% ■>.. 

Width over all, in. hes 26 30 40 

Sterilizing capacity, cubic inches ,-,,,,» ,",.',"- 9i"> . 

Bias of rack, inches 11 3s? 18 ,,- „„" 

Shipping weight, pounds 130 235 440 

With steam cod and gas burner 75.00 105.00 170 00 

With steam coil and gasoline burner 75.00 105 00 170 00 

25 



AUTOCLAVES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 
















Nos. 431A-438A. 

AUTOCLAVES, Vertical Pressure Sterilizers, made of heavy polished oopper tinned inside and 
mounted on an enclosed sheet iron base to protect the burner from drafts- The lid is made 
of heavy cast brass, iiit-kel-|<l:it<-<| ;iu<l i^r < .und prriVetly tu form a l^.is tight bevel joint without 
the use of washers. Por convenience, the heavy lids of the larger sizes are hinged, but <-ii 
the smaller sizes the lids are entirely removable to enable the operator to seat them well be- 
fore clamping with the heavy screw clamps. The lid is fitted with a safety valve set to Mow 
off at 50 pounds per square inch, an air cock through whieh the air is expelled^ B dial pressure 
gage indicating pounds per square inch, and a thermometer graduated in degrees Centigrade 
with an additional scale showing the steam pressure in pounds per square inch. Each steril- 
izer is tested for a pressure of 35 pounds per square inch. Because of the large current re 
quired to operate the electrically heated type, about 18 amperes, special wiring must be pro 
pided. For ga- heating a low form gas Imrner is provided and for oil heating a kerosene 
burner. Complete as described with a removable rack with two perforated shelves and with 
type of lid ami heating equipment as listed below. 

Eeight Diameter 

Inches Price 

8 $ 55,00 

8 58.00 

8 90.00 

11 81.00 

11 88.00 

11 88.00 

11 95.00 

11 130.00 

11 140.00 

14 117.00 

14 122.00 

14 176.00 

In ordering for electric heat, kindly state voltage and kind of current. 

For STERILIZERS of other types, see general heading Sterilizers. 

BACTERIOLOGICAL APPARATUS, sec special headings, Autoclaves, Incubators, Sterilizers, 
etc. 





Type of heal 


Type of lid 


inch 


431 A. 


Gas 


removable 


12 


431 B. 


Oil 


> • 


12 


431C. 


Electric 


1 1 


12 


132A. 


Gas 


<< 


24 


432B. 


Gas 


hinged 


24 


433A 


Oil 


removable 


24 


433B. 


Oil 


hinged 


24 


434A. 


Electric 


removable 


24 


i:. IB. 


Electrii 


hinged 


L'4 


436A. 


Gas 


<< 


•_'♦; 


4::7A. 


Oil 


<( 


26 


438A. 


Electric 


< < 


l'«; 



We maintain a special hospital and medical laboratory department, which will furnish stand- 
ard lists of equipment, compile lists for special work and make estimates on the cost of laboratory 
equipments. Hospitals desiring to meet State requirements or to become standardized hospitals, 
will find the assistance of this department invaluable. 

26 



ii a 

rider vr, 
jtk of 

■ 

gnatej 

' 

i Kr-iglm 
A 



E. 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 



ide 

)0t 

on 

ow 

re- 

ne 

itb 




re 

.00 
.00 
00 
00 
00 

oo 

00 
00 
00 
00 
00 
00 



No. 450. 



BALANCES, ANALYTICAL, CHAIN 

In the chain analytical balances is presented a novel feature of balance construction. The old 
rider arrangement is done away with entirely, and tin* liner weighings are obtained by changing the 
length of a small gold chain attached at one end to the beam of the balance, and at the other to a 
Venue? which slides on a graduated vertical column. The vernier is operated by a spiral drive COH 
trolled from a milled head on the outside of the case. By this means all weighings from l/10th milli- 
gram to 50 milligrams can be made without opening the rase or using the beam arrest. In this way 
the rapidity and accuracy of weighing is greatly increased, as there are no small weights to handle and 
count and no rider to move back and forth. We estimate that 75 per cent of the time used in making 
a weighing is saved by this new method. 

The balances themselves are well constructed, with large agate planes, finely ground knife edges, 
and separate pan arrest. The base is covered with a heavy black glass plate. 

450. BALANCE, Analytical Chain, Christian Becker No. S-A. 



Capacity 200 crams 

Sensitiveness 1 /20 milligram. 

Diameter of pans 2% inches. 



Length of beam 7 inches 

Hearings agate planes. 

Knife edges agate. 



452. 



Independent arrest for pans with automatic stop. 

W i'lth of pan support 4 inches; wider if .specified. 

Polished mahogany ami glass case, glass top, front sliding frame counterpoised. 

Dimensions of case: 16 % inches long; 9 inches wide; IS % inches high. 

Price, with Chain Vernier attachment, mounted on black plate glass base 
BALANCE, Analytical Chain, Christian Becker No. 15. 



S190.00 



Capacity LOO grams. 

Sensitiveness 1 20 milligram 

Diameter of pans 3 inches. 



Length of beam 6 inchi 

Bearings a -ate. 

Knife edges agate. 



Independent arrest for pans with automatic stop. 

Width of pan support -l inches; wider if specified. 

Polished mahogany and glass rase, glass top, front sliding frame counterpoised. 

Dimensoins of case; 16% inches long; 9 inches wide; 18% inches high. 

Price, with Chain Vernier attachment, mounted on black plate glass base 150.00 



27 















BALANCES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A : 



BALANCES, ANALYTICAL, VOLAND 




No. 455. 

Wo have sold the line of balances listed on tin- fullnwing pngog for a grout many years and arc 
convinced by the uniform approval expressed by our customers thai there are no better balani of 
corresponding grade manufactured anywhere in the world. Only the highest grmlo of materials is 
used in thoir ((instruction and they arc made under the personal supervision of men in whose family 
for generations the ar! of balance making has be sn developed with almost professional pride in its 
achievements. Since these balances are made in America, w< are able to handle all repairs and adjust 
incuts with a minimum loss of time and al a minimum expense, nut possible in the case of foreign made 
balances. We recommend them unequivocally, and each balance is sent out under our guarantee of entire 
satisfaction to the user. 

These balances present certain new features in their construction, which should commend their use 
in rapid yet precis, chemical weighing. They are of simple construction, easily adjusted, and with 
small danger of shifting sensibility sine- they are supported from a single point on a broad central 
agate plane. The releasing mechanism is of the fallaway type, controlled by an eccentric shaft turned 
by the milled bead in the front. The red graduation of the index plate and the white graduation of the 
Mack beam facilitate rapid, accurate readings. The short beam provides short periods of oeillation. 
The patented rider Arrangement makes it possible to work on either side of the zero line and prevents 
the rider from slipping back on the shank of the hook. All bearings are of agate. All cases are of 
mahogany finely finished, and provided with glass on all sides, admitting light Creel; to all parts. The 
front door is counterpoised and slides freely. The list below includes types from which oue may select 
a balance for any kind of technical or analytical work. 
455. BALANCE, Analytical, Precision Model, for use in research and in advanced chemical work re- 
quiring highest accuracy. This balance i s equipped with every refinement of balance manu- 
facture by which the accurate determination of mass may be facilitated. 

Distinctive Features: — 

Beam of hard-rolled aluminum alloy, 

Beam graduated in 50 one-tenth mg divisions on each side of zero. 

Circular -spirit level in plain sighl from front 

Rear door can be raised or removed for weiufiin^ pipettes et< 

Base completely covered with heavy black plate glass and fitted with large drawer for weights. 
Patented rider arrangement provided with Btarter lor swinging beam, operated from without case. 
Knife edges reliever 1 from contact with bearings when not in u 

Pan arrest separate from release; ran be locked 



Use. 



Specifications: — 

Dimensions of ease__lo', x20% x9% inches, 

Length of beam 7 inches 

Diameter of pans 2)6 Inches. 

Width of bows 4l 4 inches. 

Equipment Furnished: — 

One pair 3 i ich watch glasses. 
Three i" milligram riders. 
Wood bench for specific gravity work. 
Price 



Capacity son grams. 

Sensibility 1 /soil, milligram. 

Weight of rider 5 milligrams. 



$130.00 



28 




BA1 

h 
- 



\\\ 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 






A NEW PRECISION BALANCE FOR RAPID WEIGHING 





No. 457, 



Showing Details of Weight Placing Attachment 
and Vernier Reading Device. 



457. 



BALANCE, Analytical, Precision Model, same as Xo. 455, but vrith patented weight placing at 
tachment and vernier reading device by means of which all weighings from 100 mg. down can 
be made without the use of fractional weights or riders. This feature makes Balances Nos. 
457 and 461 more rapid and convenient to use than any other analytical balance manufactured 
in this country. Differences in weight of one hundred milligrams or Less are determined by 
means of a pointed sliding weight to which a vernier is attached. The position of this weight 
is controlled by a placing rod which protrudes through the side of the case ending in a milled 
head. By twisting this, a hook on the inner end is caused to engage the sliding weight which 
may then be moved to either side as desiied. A scale is attached to the upper edge of the 
beam, graduated from at the left to 100 mg. by single divisions, each tenth division being num- 
bered. The zero mark on the vernier indicates accurately the position of the sliding weight 
on the beam, the tenth milligrams being determined as usual, by the number on the vernier 
line which coincides with any line of the beam scale. 

This method of obviating the use of small weights and riders is thoroughly scientific, since it 
makes use of a sliding poise of fixed weight about whose position on the beam there is no 
room for doubt. It is entirely free from the disadvantages of the bent wire rider whose shape 
is easily distorted and which usually Hies off the beam just at the time when a weighing is 
about to be completed. It is rapid as well as accurate, eliminating the necessity for most of 
the additions which are the peril of analytical weighing. The figures on the vernier as well 
as those on the beam are plain and easily read and there is not the chance for confusion 
of figures which so frequently occurs in using fractional weights. 

We recommend this balance to industrial and research laboratories where routine weighings arc 
made in large number and where the time element is an important factor. 

Distinctive Features: — 

Beam of hard-rolled aluminum alloy. 

Beam graduated in SO one-tenth mi; divisions each side of center. 

Spirit level in rear of ba.se of column. 

Rear door can be raised oi removed for weighing pipettes, etc. 

Base completely covered with heavy black plats glass and Btted with large drawer for weights. 

Knife edges relieved from contact with bearings when not in use 

Separate pan arrest, stopper of which can be locked. 



Specifications: — 



Dimensions of case- 
Length of beam 

Diameter of pans 2% inches. 



16$ x 20Vj x OVj inches 
7 inches. 



Width of bows 4 Vi inches. 

( !s parity 200 grams. 

Sensibility - 1 /20th milligram. 



Equipment Furnished: — 

One pair 3 inch watrh glasses. 

Wood bench for specific gravity work. 

Price 



$180.00 



29 



BALANCES 



CENTBAL BCIBNTIPIC 00., OHICAQO, U. S. A. 














No. 459. 



No. 46L 






459. BALANCE, Analytical, University and Industrial Model, similar in construction to No. 45.1, but 
with shorter beam and reduced sensitiveness to facilitate rapid weighing for analytical pur 
poses. This balance is especially designed for advanced work in chemical analysis in colleges 
ami universities, and for routine analytical work in plant control and testing laboratories, 

where both rapidity and accuracy arc required. It possesses ;tll of tin- special features of con- 
struction described under No. 455 and is sent uut under our unqualified guarantee of satisfac- 
tion. 

Distinctive Features: — 

Short beam of hard-rolled aluminum 

Beam graduated in 50 one-tenth mi; divisions ink h side *>f center. 

Spirit level in reaj of l>ase of mlnnm 

Uear door can be raised or removed for wnJnn.- pipettes, etc 

Base completely covered with heavy black plate --lass and Stted with large drawer for weight! . 

Knife edges relieved from contact with bearings when not in use. 

Pati-nted rider arrangement 

Separate pan arrest, stopper of which can be locked. 

Specifications: — 



ft BA1 
wx 

BC 
U 

d 

r 
Disc 



Dimensions of case — 16% x20M »9% inches 

Length of beam G inches. 

Diameter of pans 'j'_ inches 

Width uf bows 4 VI inches. 



Cap 200 grains. 

Sensibility , Unh miIliffram 

Weigh! ol rider 5 milligrams. 



461. 



Equipment Furnished: — 

One pair 3 inch watch glasses. 

Two 5-milligram riders. 

Wood bench for specific gravity work. 



Price 



$100.00 



BALANCE, Analytical. Same aa No. 459, but with patented weight placing attachment and 
vernier reading device described on preceding page. For complete specifications, Bee No. 459 
above. 



Price 



$150.00 



30 



Equ 



Pric 






■ ■ ' i 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 







No, 471. 



471. BALANCE, Analytical, College Model, similar in construction and appearance to No. 459, but 
with solid aluminum beam, drilled to reduce its weight, and with graduations only on the right 
side of center knife edge. All parts are constructed of standard material, are highly polished 
and arc mounted in a finely polished mahogany case, characteristic of this line of balances. 
All standard Voland features described under Nos. 455 and 459 are preserved. This is an ex 
cellent balance for student work in chemical analysis and for industrial laboratories making 
routine analyses. 

Distinctive Features: — 

Short beam of polished aluminum. 

Beam graduated in 50 one-fifth mp divisions on right side of center. 

Large drawer in base for weights. 

Patented rider arrangement. 

Knife edges relieved from contact with bearings when not in use. 

Separate pan arrest, stopper of which can be locked. 



Specifications : — 

Dimensions of case— 16% x20% x9% inches 

Length of beam 6 inches. 

Diameter of pans 2V£ inches. 

Width of bows 4 "4 inches. 



Capacity 200 grams. 

Sensibility 1 /10th milligram 

Knife edges and bearings agate. 

Weight of rider 5 milligrams. 



Equipment Furnished: — 



One pair 3 inch watch glasses. 

Two 5-milligram riders. 

Wood bench for specific gravity work. 

Price 



S85.00 



31 









BALANCES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



487. 






CENCO ANALYTICAL BALANCE 




/ 





No. 487. 

BALANCE, Analytical, Cenco Model, •). dgned t>> meet the needs of educational and commercial 
laboratories for an economical bul dependable analytical balance. 

Hade especially for us by Voland & Runs, mir uf tin- largest and best known balance makers in 
America, it baa all oi the special features wWch have made their balances distinctive, such as 
white graduations on a black brain, red graduations on the white index plate, aluminum pans, 
patented rider carrier, solid mahogany i tse, etc. The entire cost of the balance is in essen- 
tials, as the balance has brrn simplified and the cost of con>trurfinn reduced to the lowest pos- 
sible figure by means of automatic processes and machinery. As a result of several years ex- 
perience during which we have placed hundreds of these balances in educational and industrial 
laboratories, we do not hesitate to affirm our belief that :» comparison of this balance with 
those of other makes, either American or foreign, will show it to 1"' superior to any balance now 
obtainable for the same amount. We welcome such n comparison and will send a sample foi 
thorough examination to any established institution contemplating the purchase of such 
balances. 



Specifications: — 

Beam polished aluminum. 

l.i-nirth .if iieaiu 6 in graduated io 1 5m?. 

Divisions of beam -50 to right of center 
Sise of case 16% * L7x9}j inches. 

Bust- slate. 



Distinctive Features: — 



Capacity 200 grains 

Sensibility 1 . 10 mg 

Knife edgea and bearings agate, 

Weight of riilcr lb mg. 



Knife edpes free from contact when balance is at rest. 
Iii<li-lM*ii'U'iit iirifsis for beam, stirrups and pans 

Feiulc-rs nt en. I of stirrup supports to check extreme swinir of beam and prevent jarrinc or slidine of 

stirrups on knife edges. * 

Hiirli s.-hMbility and rapidity of suing. 
Graduations of heam white on black background. 
Index plate graduated in red. 

No steel in construction of balance and hence no corrosion. 

Case «.f fine polished mahogany with counterpoised from .|<m M - and plass on all sides 
Simple rider construction with patented rider hook. 
Base of heavy slate, to which all parts are firmly attached. 

BALANCE, Analytical, Cenco Model, as described, on heavy slate base $55.00 

Note:— This balance should oot be confused with those similar in appearance but of cheaper con^ 
Btmction, with east metal pillar, single release for beam, stirrups ami pans, and with zero over 

tho left knife* Gnat* 



the left knife edge. 



32 



f 



BAL 

u ' 

If 1 

t fe- 
ll 

got ii 




*tt BAL, 



fa- 



"H Bal 



rti 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 





No. 503. 



No. 509. 



BALANCES, ASSAY 

Complete information will be furnished upon request to anyone interested in Assay Balances. They 
have been omitted from this general catalog, since they are not of general interest. 

BALANCES, GENERAL LABORATORY 

BALANCES, General Laboratory, for use in educational ami industrial laboratories for purposes 
which Jo not require the degree of precision obtainable with an analytical balance. They are 
widely used for calibrating glassware, for weighing large samples of material, for weighing 
portions of reagents for solutions, for drugs, sugar, pulp, etc The beam is raised by an eccen- 
tric movement operated by means of a milled head in the B size and by means of a handle in 
the others. They are provided with steel knife edges and agate bearings, beam arrest, adjust- 
in- screws on end of beam, removable nick el -plated weight pans with handles, and are fitted 
with level and leveling screws. 

Xo 

Capacity, grams 

Sensibility, mg 

Diameter of pans, mm 

I dam length, nun 

On polished mahogany box with drawer $24.00 

In polished mahogany case with counterpoised sliding 

front door and drawer 38.00 



503. 

ouy. 



B 





D 


E 


150 


300 


600 


1500 


2 


5 


5 


1(» 


82 


1012 


127 


152 


17H 


235 


267 


286 


4.00 


30.00 


40.00 


50.00 



50.00 



60.00 



80.00 




5 1 J 




514 



No. 514 

BALANCE, General Laboratory, all-metal, made entirely of magnalium which offers a high de- 
gree of resistance to all laboratory fumes. It has the further advantage of being light and 
strong. The knife edges and bearings are of agate. The beam is graduated and notched to 
facilitate the use of rider. Provided with beam support and leveling screws. Capacity, 100 
-rams; sensibility, 3 mg; diameter of pans, 7."> mm 30.00 

BALANCE, Geraral Laboratory, Simplified Type. Beam 150 mm long, pans 65 mm in diameter. 
Mounted on base with drawer. Capacity, 1(H) grams; sensibility, 1 centigram 12.00 



33 



■ 



■ 



wmmmm 






BALANCES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 







BALANCES, TORSION 



No. 517. 




No. 520, 




/ ""'WWUu.aco 




No. 525. 




No. 528. 



In the Torsion Balance the twisting of a steel band takes the place of the knife edge fulcrum and 
this with its relatively short period of vibration makes the balance very rapid for accurate work. 

Anions; those listed below will be found balances for practically every laboratory purpose except 

for the most precise analytical work. 

517. BALANCE. Torsion, Cream Test Balance. Enclosed in white enameled box with index and 
arrest, counterpoise beam with sliding weight inside operated from without. Object pan con- 
structed especially for holding one milk oi nvain test bottle. Capacity, 1 bottle- sensibility 
16 milligrams. Complete with one 9 gram and one 18 gram weight. Dimensions, 10% x6x9% 

inches over all »oc nn 



I 



520. 



S35.00 




525. 



weight plate, 4 inches in diameter; capacity, 1 kilogram; sensibility, 6*/> ec> Com- 
plete with set of brass weights in block, from 5 grams to 100 .' ~ , 35.50 

Note: — For another balance for use in testing grain, see No. 654. 

BALANCE, Torsion, Moisture. Enclosed in white enamelled case with leveling screws and 



528. 




BALANCE Torsion, Seed Testing designed especially for seed analysis and for acidity of eon, 
as described in Bulle tin 102 United States Department of Agriculture. Enclosed in glass ca<.' 





34 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 




532. 



53 G. 



540. 



544. 



No. 530. 




No. 532. 




No. 540. 




No. 536. 




No. 544. 



530. BALANCE. Torsion. Solution or Presciption, in jjlass case with cover. Provided with slide beam 
graduated from .100 to 5 milligrams, with rider operated from outside of glass case. Pans of 
German silver 3 inches in diameter; capacity, 120 grams; sensibility, 2 milligrams. Au excel- 
lent balance for use in making up volumetric solutions, or for prescription work. Dimensions, 
13 x G'/i x 6 1 -. inches over all ««n on 



$60.00 

BALANCE. Torsion, Solution, with 9 inch nickeled brass pans and slide beam, and with high 
poise ball and index. Length of beam 12 inches, graduated to 500 grams by 5 grams; capacitv 
of balance, 4 l j kilograms; sensibility, 15 centigrams 32.00 

BALANCE, Torsion. Solution, same construction and specifications as No. 532, but with counter- 
poise beam. Bottles, cas-, roles or beakers may be tared by sliding weight on beam, facilitat- 
ing weighing and eliminating errors. Capacity, 4> L . kilograms; sensibility, 2". centigrams 35.00 

BALANCE, Torsion, Solution, in glass and metal case, nickel plated throughout. Slide beam inside 
ease graduated to 100 grams by l gram, with rider operated from outside. Nick. led brass pans 
9 inches in diameter. Capacity of balance 4% kilograms; sensibilitv. 20 ceutigrams. I'im.ii 
sions, 201/. x 9% x9'/ 2 inches over all ' go.00 

BALANCE, Torsion, Soil, with flat porcelain plates, 6 inches in diameter. Slide beam 9 inches in 
length, graduated to 10 grams by l/10th. Capacity, 1 kilogram; sensibility, 6»/ 2 centigrams. 
High poise ball and index t , 31.00 

35 



BALANCES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 





No 552. 



No. 554. 





No. 557. No. 553B. 

BALANCES, MISCELLANEOUS 

552. BALANCE, Cement Scale, for determining percentage of fineness oi cement. Beam graduated on 
ripper side* to HI ounces bj ] t ounce, lower ride to 1009! by 1%. Should l»< used in connection 
with our No. 12124 sieves. «'an also !>«■ used for dirt in Bred, moisture in ^rain, ores, etc. 
I 'omplete with brass scoop S12.00 

.v>;: IV BALANCE, Cement, for determining fineness ol cement, with beam graduated to weigh to ~>'M) 
i^ t : i » 1 1 — I iy 1 100 gram divisions 19.00 

554. BALANCE. Counter or Dispensing, m ebonj box with marble i >p and nickel-plated pans 

No o i 

I iapacitj , lbs ;, g 

Diameter of pans, inches 7 8 

Sensibility, graini 20 2(i 

Eac * 24.00 27.75 

557. BALANCE, Cream and Milk Testing, for weighing samples for the Babi >ck test. Tfris balance 
is of the same construction as our well known Cenco Agate Bearing Trip Scale, with rigid 

one pi« < , I,, ,,!,, ,,\ ; , | | im i ii uiu ;i 11 < i v . 6 i n* h round porcelain plates, hardened steel knives and 

agate bearings. In place of thv usual ^r:..luatr.l beam, a round bar is provided carrying a 

lar-r an. I small counterpoise for use in balancing the empty milk test bottle. The counter 
poises may be locked in place by means of set screws. A polished wooden block is attached 
to the front of the base, containing !) and 18 gram weights. The balance is nicely mad.- and 
well finished. Capacity, one bottle; sensibility, 100 milligrams 15.00 

36 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



BALANCES 



,-iii). 



No. 566. 




CHATILLONS 



IMPROVED CIRCULAR 
SPRING BALANCE 

TO W£JCH 3 01b 
BY OUNCtS 




No. 562. 




No. 560. 



No. 571. 



BALANCE, Cream, Wisconsin Hydrostatic This balance has been devised to meet the demand 
for a simple and correct method of weighing cream into test bottles and consists of a specially 
devised brass float, which is placed in a cylinder of water. Very accurate weighings can be 
made with this instrument, and as there are no bearings to rust it will retain its sensitiveness 
indefinitely. Complete with metal cylinder, float and 9 gram weight, but without bottle. $7.50 

561. WEIGHTS, Extra, for Nos. 557 and .160. 



No A B 

Size, grams 9 is 

Each 30 .95 

562. BALANCE, Decimal Milk. This spring scale is intended especially for use in connection with 
the IJabcock Test for keeping records of the quantity" of milk from individual cows, together 
with the percentage of fat, so as to calculate the butter yield. The scale is provided with a 
loose pointer, which by means of a thumb screw may be set anywhere on the dial to offset the 
weight of the milk pail. The readings being in pounds and decimals of pounds makes the cal- 
eulation very much simpler than when pounds and ounces are given as on the ordinary scale. 
(Decimal divisions not shown in the illustration.) Capacity, 30 pounds, weighing by 1/20 
pound 8.50 

566. BALANCE, Family Scale, Standard, with slanting white enameled dial; weighs 24 lbs. by 1 oe. 
divisions; with square sheet steel platform and tin scoop 3.80 

568. BALANCE, Family Scale, Metric, tttme as No. 566, but for weighing 10 kilos by 50 gram 
divisions 4.50 

571. BALANCE, Hand, with 7 inch polished brass beam, steel knife edges, and horn pans supported 
by cords 3.00 

37 






BALANCES 



OBNTBAL SCIENTIFIC CO., CHICAGO, U. 8. A 












574. 



CENCO HEAVY-DUTY LABORATORY BALANCES 

Agate Bearings. 



gQP»* 




572. 



BALANCE, Laboratory, designed for 
those desiring e ragged balan 
capable of weighing loads up to 2000 
gi ame, yet made with sufficient csi p 
t,, permit a sensibilil j of 100 milli 
grams or less. 

Capacity, 2 kilos. 

Sensibility. Loads up to L* kilns ran !><■ 
adily weighed within 0.05 gran 
Sensibility on light loads is much 
greater. 

Beam, open construction. A rider upon 

beam i ml i<nt »-s ;ill amount-; up to 1 

grams bj i 10 gram divisions, s< h 

division lii'in;' - ~>4 mill long, making 
small weights unnecessary. 

Damping Device, positive in action, 
brings balance quickly to rest 

Bearings: Knife edges of high grade 
steel, carefully polished ami adjusted, 
resting in grooves of polished agate 

Hangers of unproved design, eliminate 

ing tint it .11 and woar. 

Pan Arrest. The base serves as an arrest, enabling the operator to move balance safely whih 
loaded. 

Leveling Screws are supplied, insuring greater sensitiveness. 

Pkunb Bob, nol shown in illustration, mak< b accurate leveling a simple matter. 

Adjusting Screw protected within open work of beam. 

Dimensions. Length of beam between knife edges, 32 cm. Length of graduated part, 25*4 cm 

Pans, of aluminum I * cm in diameter- Height of balance, 45 cm. Width of hows, IS cm; height 

Of bOWSi 35 • hi. Pans, b0W8 and stirrups accurately balanced, making t hem interchangeable. 
An Adjustable Shelf for spei ifii gravity work is included. 

Price 



No. 672. 



$17.50 



BALANCE. Laboratory, similar to No. 
572, but more sensitive and of better 
finish and construction. Mounted on 
polished, mahogany finished base pro- 
vided with Leveling screws. Sliding 
rider on graduated beam indicates 
weight up to LO grams in 1 10 gram 
divisions. Prismatic steel bearings 

and grunved agate supports* An ec 
centric movement operated by knurled 
head raises beam from beam arresl 
Provided with ahelf for specific grai 
itv work. Made of brass finely fin 
ished; pans of aluminum. Plumb bob 
ami protected adjusting screw as in 
No. 572, Eeight of balance, 48 em; 
diameter of pans, 14 cm; length ol 
beam (between knife edges), 32 cm. 
Capacity, 2,000 grams. Sensibility 

with full load, 30 milligrams or lees, 

which is increased with smaller 
loads 37.50 




No. 574. 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 





No. 577. 



No. 596. 





No. 584. 



No. 604. 



577 



m 



BALANCE Lecture Table, a short arm balance of large capacity but high sensibility for use in 
lu-t ure table demonstrations. The bearings thoughout are of agate, the beam is of aluminum, 
* ippmted by a central pillar of iron finished in black enamel. Arrests are provided to relieve 
^J[^^~P 8tn » n, /»»t»«-twh t .»iiiotinu 8 e. The removable pans are equipped with brush 
stops. be balance is mounted on a polished wood... has.- provided with cross level and level- 
ing screws. ( apacity, 3 kg; sensibility, 20 mg; diameter of pans, 19 cm $70.00 

BALANCE, Platform Express Package Scale, with platform 10% x 12 inches, with double beam, 
lower bar graduated to o0 pounds by 5 pounds, upper to 5 pounds by 1 ounce. Finished in ma- 



roon, ornamented 



24.00 



-,'.H] 



BALANCE Platform, for obtaining persona height and weight. Constructed of metal through- 
out with tail pillar, placing beam on level with eve. Finished in white enamel with nickeled 
•am, graduated to .", pounds by l ounce. Rest of 250 pounds capacity 
'ights. Platform 10'/ 2 x 14" u inches, with measuring rod. Complete wi 



wi 



on the counterpoise 

th weights 33.60 



504. 



BJ ^^ E ' Pl ' escTi ^ n (Army), nickel-plated, mounted on a box with drawer with 6 inch beam 
lilted by a lever. Capacity, ~>0 grams 5 30 



39 






BALANCES 



CBNTBAL SCIENTIFIC CO., CHICA GO, U. 8. A 










No, 606, 





No, 608. 



No. 610. 



i)i)C>. BALANCE, Solution, provide*] wit li two wri^hin^ hrjuns ;iml sliding puisr*. One heani is divided 
into one hundred parts, each part representing one gram; the other beam is divided into ten 
parts, each part representing one hundred grams. A bar with sliding poise is placed under the 
weighing beams t'<>r the purpose of balancing the empty bottle or container, which is quicklj 
done by sliding the poise along the bar until a correct balance is secured. Thia balance will 
be found indispensable in soil study where quantities up to 20 kilos meed to be weighed with 
accuracy. Sensibility x 1 ^ram $67.50 

608. BALANCE, Specific Gravity, Hydrostatic. Excellent for work in specific gravity experiments. 
Prismatic steel knife edges, adjustable rod supporting beam, and beam arrest. Beam can be so 
el«v;itr.l that hook under short pan is 30 centimeters from the table. Mounted on neatly 
japanned iron base. Length of beam, 25 centimeters; diameter of pans, 10 centimeters; ca 
parity, 200 grams; sensibility, 1 centigram . . . 9 00 

610. BALANCE, Specific Gravity, Westphal Type. This is a handy and improved form for exact and 

quick determination of the density of liquids. In polished hardwood box, with Reim&nn's ther- 
mometer sinker having displacement of S ec. This balance overcomes all trouble with incorrect 
hydrometers and forma an easy means for standardizing hydrometers. Complete with 5 50 500 
milligram, and 5 gram riders, and 15 gram counterpoise 24.00 

611. Thermometer, Extra, reading from 10° to 30 C, with displacement of 5 cc 3.50 

612. Weights, Extra, for No. 610 Balance, per set, without counterpoise 2.50 

3650B. Glass Jar, Extra, for No. 610 Balance B 35 

40 




m I 



• BAL 

Hi 1 

lot 

fc! 

cai 
iii 
ft 

K 

* sca; 

lie 





SCA. 




P 


624. 


SCA. 




Id 


- 


SPR 




it. 




SPR 




gr 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 




CENCO JOLLY BALANCES 

615. BALANCE, Specific Gravity, Jolly's Spiral Spring, precision type, (pat- 
ented ), with vernier reading attachment. This balance is constructed 
with telescoping tubes, the inner one of which is caused to move upward 
or downward by means of an internal rack-and-pinion operated by a 
knurled thumb-screw located at the side near the bottom. The inner 
tube is graduated for a length of 50 centimeters in tenths, while the 
outer tube is provided at the top with a vernier, past which the scale 
on the inner tube slides, enabling the instrument to be read to 1/10 
of a millimeter. Oscillations of the spring are damped by stops 
striking the ends of the glass tube within which the index moves. A 
hair line is etched around the glass tube, with which the middle one 
of tlir three lines on the index can be readily brought into coincidence 
enabling accurate and rapid settings to be made. The inner tube has 
a range of motion of 50 centimeters, which, by the proper choice of a 
spring, permits the use of this balance for a wide variety of purposes. 
It is very substantially made and nicely finished, with nickel-plated 
tubes mounted on a tripod base of japanned iron provided with level- 
ing screws. Many uses may be found for this balance in any labora- 
tory, where quick and accurate deteiminations of specific gravity must 
be made. It has become the standard means for determining the 
specific gravity of rubber and rubber products. Complete with light 
and heavy spring, special indicator and stops, adjustable platform and 
aluminum and glass pans $50.00 

6 15 A. INDICATOR only of No. CI 5, with glass tube 1.50 

615B. GLASS TUBE only of No. 615A 40 






No. 615. 



618. BALANCE, Specific Gravity, Jolly's Spiral Spring, made entirely of metal 
and nicely finished throughout. The upright is a niekel-plated rod 100 cm 
long supported by a japanned iron tripod base provided with levelling 
screws. The platform is of oxidized brass which slides along the rod and 
can be clamped in any position. The spring support is also adjustable 
and can be inverted for light loads or heavier springs, allowing a larger 
range. An adjustable mirror scale 65 cm long, graduated in millimeters, 
is provided The pans are of aluminum. Furnished complete with spring 
No. 628 8.50 

620. SCALE PAN, for Jolly's Spiral Spring Balance No. 618. Lower pan of 
aluminum, with copper wires .25 

622. SCALE PAN, for Jolly's Spiral Spring Balances Nos. 615 and 618. Upper 
pan of aluminum, with copper wires .30 

624. SCALE PAN, for Jolly's Spiral Spring Balance No. 615. Lower pan of 
glass, with platinum wires 1.00 

626. SPRING for Jolly's Balances Nos, 615 and 618, light. Elongation per gram, 
about 5 cm .35 

628. SPRING for Jolly's Balances Nos. 615 and 618, heavy. Elongation per 
gram, about 0.8 cm 35 

41 




No. 618. 



BALANCES 



NTKA1. & IKNTIFir CO., CHICAGO, U. 8. A. 






tf30, 



'■>.;■:. 



6. 






838. 



r,4u 



642, 




. IMPR0yU> , 



BALANCE. Spring. English, cylindrical packet form, < -*"' 

t<> ni.N iati- the wro error. Bead* to 15 lbs. in 4 as. dn isions. 
Spring elongate* -'» Inches 

BALANCE. Spring. English, 25 pounds 
oun< dfr Lsiona. Spring elongate 

inches 

BALANCE. Spring. Eng 

lish and Metric, with flat 

ba< h and bi oad pointei , 

for either perpendicular 

or horizontal reading 

K» adfl to s oz. in ' i « ,/ - 

,li\ (Mens and 250 grani9 

in in gi am divisions 

spring elongal ee - ! i 

inches 1-30 

BALANCE. Spring, Eng- 
lish and Metric, with Ba1 

bark and bi oad | > < »i >i t t • i . 

for either perpendicular 

or horizontal reading. 

Beads to 64 oz. in 1 oz. 

divisions, and 2, 

grams in 25 gram divi- 
sions. Spring elongates 

l m , inches -80 

BALANCE, Spring. Eng- 
lish and Metric. Capa- 
city, I s oz. in 1 5 oz. 

divisions and 500 grams 

in l lt gram dn isions. 

Bas flat hack and sharp 

pointer, and is pro* ided 

with sei e* al di^ isions 

above the zero to com 

pensate for the sha rp 

pointer in horizontal 

readings. Spri ug elon 

gates 4 inches . . 3.80 





i ^ 



CHATIIliSfa 
- wyyunc 




No. 630. No. 636 



No. 638. 



No. 640. 



No. 644. 



BALANCE, Spring, English and Metric, with flat back. Beads to 30 lbs. in % lb. divisions, and 
L5 kilns in in" gram divisions. Spring elongates 5% Inches 3.30 

644. BALANCE, Spring, English and Metric, in iron ,■;.>,- with sliding index n-torder. Especially 

designed for experiments in tensile strength, the indicator remaining at the breaking strain, 
instead of going back to zero when the strain is released, as in the case of the regular spring 
balances. Roads to 30 lbs. in % lb. divisions, and 15 kilos in 100 gram divisions. Spring 
elongates .".'o inches ^ 10.00 

645. BALANCE, Spring, for mechanical analysis of road material, see page 116. 

646. BALANCE, Stoddard Labora- 
tory, designed by Prof. J. T. 
Stoddard, Department of 
Chemist rv, Smith College, 
Northampton, Mas I b pa- 
city, 121 grams; sensibilitv, 
less than 1 eg. Especially 
suited for use in Elementary 
Chemstry, since it is much 
more accurate and easy to 
handle than the Horn Pan 
Balance, and more durable 
than the cheap equal arm 
Chemical Balance. 
Five riders are furnished, 
which weigh 10 g., 1 g., 1 g., 
0.1 g., and 0.01 g., respec- 
ts 4. u tl i_ ™ , ..,-.. tively, when placed on the 
first notch on the beam. These values multiplied by the number of the notch give the weiuht 
required. Por example, the balance in the illustration is in equilibrium with a mass of 37 7 
grams in the pan. When not in use the riders are kept in a covered receptacle permanently 

attached to the base of the balance l VI J£ 

■ 11.00 

42 




No. 646. 



bw 






CENTRAL SCIENTIFIC CO., CHICACJO, U. S. A 



BALANCES 






* 









s 




* 



r 



: 







648. 







64!) 
650 






652 



-■ 






654, 
656, 



r:> 




CENCO AGATE-BEARING TRIP SCALES 




No. 650. No. 654. 

BALANCE, Trip Scale, Cenco Agate Bearing. Capacity, l'ooo grams; sensibility, 1 10 gram. 

The design of this balance was originally developed by us as a modification of the rugged Har- 
vard trip scale which, while retaining the good features of ruggednesfl and durability of the 
latter, would at the same time possess a sensibility and freedom from corrosion which would 
Adapt it for laboratory use. In the original Cenco design the heavy roughly cast iron parts of the Harvard 
type were replaced by machine-formed parts of l»rass and steel protected vv it li n QOD-COrTOSivO coating Ju 
cently these materials in turn have been replaced by an aluminum alloy which combines rigidity with light- 
ness and freedom from corrosion. The hardened steel knife ed^es and a^jite hearings are set permanent I \ 
in plate in the metal during the process of forming so that they are always in proper alignment. The sti'el 
knife edges are first carefully polished and hardened and then protected ag-aii^r corrosion by a chemical 
process so that the balance not only possesses an unusually high sensibility nut retains it throughout a lonj: 
life. The only iron part remaining is the substantial base of cast iron which is finished in durable japan 
baked on at a hitfh temperature. The balance is equipped with 5% inch round porcelain pans and a beam 
of nickel-silver with etched irraduation.v The graduated beam has a ranee of lo grams in 1 /10 pram divi- 
sions The capacity of the scale is 2000 grams. Sensibility is guaranteed to be 1/10 gram with full load. 
\< tual tests show a much greater sensibility with smaller loads. 

A very convenient feature of our latesl design is a hook placed directly below the knife relies 
of each scale pail, from which heavy objects may be easily suspended for specific gravity work. 
A set screw is also provided by means of which the balance may be damped to a 13 mm support 
rod, and so elevated above the table top $11.00 

PORCELAIN PLATES, extra for No. 648, for replacement per pair 1.30 

SUPPORT, for No. 648 Trip Scale. Consists of a table clamp of special design (No. F197), and 
a No. V\:\'.i Support Hod, 20 em long. This forms a most c«>nv< ru» nt means of supporting No. 
648 Trip Scale for specific gravity work, as the scale is provided with a set screw for damping 
to a support rod, and with specially designed hooks for supporting specimens which are to be 
weighed under water 1.50 

BALANCE, Dispensing and Solution Scale, with Agate Bearings as described under No. 648. This 
balance will be found ideal for laboratory and pharmaceutical work. The pans are of heavy 
aluminum, 15 cm in diameter. The graduated beam lias a range of 10 grams in 1 10 grain 
divisoins, and brass weights from 10 grams to 100 grams are supplied, conveniently fitted into 
a projecting holder. Capacity, 2,000 grams. Sensibility is guaranteed to be 1/10 gram with 
full load; actual tests show a much greater sensibility with smaller loads 14.00 

BALANCE, Grain Test. Consists of No. 648 Cenco Agate Bearing Trip Scale with the addition 
of a funnel scoop and counterpoise, accurately adjusted 15.00 

TUNNEL SCOOP AND COUNTERPOISE, only, of No. 654 4.00 

For Weights for use with No. 654 in grading grains, we recommend Set No. 742E, on page 46. 

43 






BALANCES 



CENTRAL SCIENTIFIC CO., « I IK AGO, U B. A. 






fi.-,.s. 



660, 



700. 



702 



703 



704. 



706. 






CENCO TRIPLE BEAM BALANCE 





No. 658. Nos. 700-706. 

BALANCE, Triple Beam, Cenco, for physical and chemical laboratories. The three beams are 
placed in the same horizontal plane, thus conforming to scientific principles involved, which is 
oot true of other styles of Triple Beam Balances. Weighings are obtained by movement oi the 
riders along the beams. These riders are easily handled and quickly placed in the notches, but 
cannot !»<• removed from tin beams. An adjustable support is provided for a jar or othei 
receptacle for experiments in specific grai ity- Proi ided with stable base neatly japanned, and 
with sensitive spirit level and leveling -• n w. Balance neatly HhMm'-I in ni* k<l plat.' and japan 
Capadtv of mi'Mle In-ani, loo grams by 10 gram 1 1 i \ i s i < » j i > ; back beam 1<» grams by 1 gram 

divisions; front beanij 100 centigrams by l centigram divisions Total capacity, ill grams^ 
sensibility, with or without lull toad, guaranteed to l centigram. Accuracy^ about 5 mg. Di 
ameter of pan, '.'.:. cm; width "t* bow, l"" cm; height <>t' bow, 22 cm. Features .'.-isiiy recog 
nized are: rapid w.ighing, '"n-tant sensibility, accuracy, freedom from loss of weights, no in 

terf eren ce or breaking of weights $17.50 

weight, Extra, with lo.uk, for use with No. (V)H t for weighing over ill grams, but not to ex- 
ceed 201 grams. Weight must i" used only on the 100 gram notch of the middle beam*. 1-50 

WEIGHTS, ANALYTICAL 

WEIGHTS, Analytical, Gold Plated, Highe t Accuracy, adjusted to meet the requirements of the 
United States Bureau of Standards, Class M. Useful for checking accuracy «>t other weights. 
Gram weights made of Tobin bronze, one piece heavily gold plated; fractious of gram of ]>lat 
inum with .'5 — in mg riders. In polished mahogany velvet lined box with hinged covers. Fur 

nished with Unit.'.l States Bureau of Standards Certificate. No A B 

Size 1 mg to, grams 50 100 

Per set 106.00 117.00 

WEIGHTS, Analytical, adjusted within the tolerance of the United States Bureau of Standards 
for analytical work. All gram pieces are of brass, heavily gold plated. The fractionals fmm 

■'' 't_' to "in mg ;ire of platinum and from 20 mg to 1 mg of aluminum with 3 — 10 mg riders. 

In polished mahogany velvet lined box, •with hinged cover, and with forceps. Each weight 

fitted in separate compartment. \'o B C 

Size 1 mg to, grams 50 100 

*w set 25.00 27.00 

WEIGHTS, Analytical. Standard. These weights are of the same specifications as No. 702, but 
conform to the specifications of the Bureau of Standards for analytical weights as closely as 
possible, and have been submitted to the Bureau of Standards for test. Bach set is accom- 
panied by a report from the Bureau, but because the requirements of the Bureau are so severe, 
only an occasional set receives a certificate. Since the report shows definitely their divergence 
from the theoretical standard, we consider them just as useful for research or control work as 

are the more expensive standards with certificate. No A B 

Size 1 mo; t.., grams -,m ioo 

Per set 47> 50 52.50 

WEIGHTS, Analytical, Standard, same as Xo 703. but furnished with I'mid States Bureau of 

Standards Certificate. No A B 

Size 1 mg to, grams 50 . 100 

^ er set 50.00 55 00 

WEIGHTS, Analytical, same quality as No. 702, but carefully lacquered instead of gold plated. 

*°- •••••■ A B C DBF 

Ny.' 1 mg to, grams 20 ,-,, 10n ._, (ln -„ 100 „ 

Per set 19-50 20.00 22.50 32.00 38.00 46.00 

44 



V 




n~\ 




;„. WE 

t< 

w 



■ 


WE 




u 






". 


Wei 




E 


m 


WE 




1 







J30. EH 



WE 



WI 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



BALANCES 




No. 708. 



e^f^-D*z> <5v> O fc> 



•Jrf 






No. 720. 





No. 710. 



No. 731. 



No. 718. 



7os 



710. 



712. 



"is. 



r2o. 



7 20. 



731. 



WEIGHTS, Analytical, Precision, for use with Nos. 450 and 452 Chain Balances. Of lacquered 

brass, with fractional weights Prom 500 n.g to 50 mg of platinum. Adjusted to within the 

tolerance of Class s Bureau «>!' Standards. In polished velvet lined mahogany box. Complete 

with forcep 

No B C 

Si/. 50 mg to, grams 50 Inn 

Pe r set 28.50 31.50 

WEIGHTS, Analytical, Fractions of Grams, of same quality as supplied in above sets. In pol- 
ish, 'd wooden l»o.\ with slip lid, with separate compartment for each weight. 1-2-5-10-20 mg 
pieces of aluminum; 50-100-200-500 mg pieces of platinum per set 28.00 

Weights, Analytical, Fractions of Grams, same as No. 710, but priced singly. 

. Aluminum >, , Platinum- « 

Size, mg 1 2 5 I" 2u 50 ion -jou ;,oo 1000 

Each 30 .30 .30 .30 .30 .75 1.10 2.20 4.50 9.00 

WEIGHTS, Analytical, designed for student use, accurately adjusted. Gram pieces of solid brass, 
polished and lacquered. No loose balancing material used as all adjust men ts are made on 
knob stem. Fractional of aluminum, the box of natural mahogany with hinged lid, velvet 
lined, with separate compartment for each weight. A pair of brass forceps is supplied. 

No A B 

Size 1 mg to. grams 5(1 100 

Per set 10.00 12 50 



RIDERS, Analytical, of aluminum, very carefully adjusted. 

Size, mg 12 10 6 5 3 2 1.2 1 .6 

Each 25 .25 .25 .25 .25 .25 .25 .25 .25 



WEIGHTS, Factor, of brass lacquered, for the rapid analysis of iron and steel. 

A. Carbon Factor 2.7273 grams 

1! Vz Carbon Factor 1.3636 grams 

C. Vi Silicon Factor 1.1755 grams 

D. Phosphorus Fact cm- - 1.63 grams 

E. 1/10 Silicon Factor 0.4702 grams (platinum) Each 

WEIGHTS, Normal Sugar, of In ass, lacquered, in mahogany box with hinged lid. 



Each 
Each 
Each 
Each 



No 

Set of 

I Sonsistiug of, grams 
Per set 



A 

2 
I.: 
26 

600 



.5 
.25 



1.80 
1.80 
1.80 
1.80 
8.00 



B 
3 
13 
26 
52 
7.00 



45 






BALANCES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A 














No. 736. 



No. 734. 





No. 740. 




, 



r^<~^<L oo, 




'-'("'(. #■. ' i£—j?1 





No. 742. 



No. 738. 



No. 746. 



WEIGHTS of MEDIUM GRADE for LABORATORY and TECHNICAL WEIGHING 



734 



'::.; 



738, 



740. 



Weights, Medium Grade. Metric, gram piece* of solid brass, flat shape, heavily lacquered: frac 

tionalsol German silver; in polished hardw 1 box with hinged cover, with forceps; with seo- 

arate compartment for each w< ight; fractionals under glass cover. 

£°- ••••-• A B C I) E F 

&ze lmg to, grams 20 50 100 200 500 10O0 

^ er SCt $4.00 4-50 5.00 7.00 9.00 13 00 

^KfSttf^ ' lURlity - "* 7:i4 ' b " '" P° li8hed ****** "oak in- 

No A B c D 

S^lmg to, grams "; 2 50 100 200 500 

" SCt 2.00 2.50 3.00 4.50 6.50 

WEIGHTS. Metric, separate weights, same quality as No 734 and 7;.;. for reph ata 

Each 10 .10 .1£ .18 .20 5K "" - 8o fjfj 



F 
1000 
9.50 



Each" in i~n ,. 'd L " : ' ,, l0 ° -"" 5 <«> 1000 

±,acn 10 10 1L -18 .20 .35 .45 .80 170 2 80 

WEIGHTS. Metric, of polish,,] brass, in hardwood block with hinged eover, suitable for ordinarv 



•rct-jis. 

No. A 

Size !,.„ ^uj. 



742. 



B 

1(MT .-,(),f 

Per se t 1.30 1.50 1.90 

WEIGHTS. Metric, of brass, same as No. 740, but in hardwood 



(' 
lcg-lOOg 



NO. \ 

Size Leg 20g 

Per set l.oo 

WEIGHTS. Metric, Brass, same 

Sl'ts. 



B 
leg 50g 



C 
lcg-lOOg 

1.70 



D E 

Ig-LNlOjJ ly .- j, 

2 80 5.00 

block. Without forceps. 

D e 



F 

lg.ll.00g 
8.00 



grad< 



as 



130 170 2.30 4.00 

Nos. 74d and 742, separate for replace 



F 

lg-lOOOg 

6.50 

ments in ether 



744. 
745. 

746. 



748. 



7f.it. 



Si/..', w | ;||,is J 

Each, flat form ..,', .09 

Each, tall form Q8 



a 

.09 

.08 



.i 
.13 
.10 



in 
.16 
.15 



20 

.18 
.15 



50 

.32 
.30 



Weights. Metric, Fractional, of G-man s.h-r and aluminum Set 1 
duphcates of 2, 20 :,.,! l-.„. null,,,;,,,, ,.i,,,s. ,„ ,,v, red hard woo 
Bach weight in a separate compartment; with brass forceps 



ll.ll 

.42 
.40 



• > 



200 
75 
.70 



500 1000 
150 2.50 
140 2.60 

to 500 milligrams, with 
>d box with sliding cover. 

WEIGHTS, Metric. Fractional. Single, same as No. 7is ,.., ^u'J^LL P ** 



same as No. 748, for replacements . . eacn 



46 







CENTRAL SCIENTIFIC CO,, CHICAGO, U. B. A. 



BALANCES 




x 



16 




No. 752. 






No. 758. 



No. 754. 




B 

5 


Q 


o 

o 




x> 


i 

> 


* 


o 



No. 762. 





No. 760. 




No, 766. 





No. 764. 



No. 768. 



752. 
754. 



756. 



7.-.H. 



760. 



762. 
764. 



766. 
768. 



A 

1 
6.75 

Pounds 



B 

-_• 

8780 



1 
1.95 



g 

3.00 



C 

4 
12.00 

4 
5.40 



WEIGHTS. Avoirdupois, of nickel silver, from 1/128 to V4 ounce, consisting of One each 1 12k, 

1 64. 1 32, 1/16, V 8 and V4 <>z Per set $3.50 

WEIGHTS, Avoirdupois, of brass, in hardwood block, carefully adjusted. 

No 

Size, % oz. to, lbs 

Per set 

WEIGHTS, Avoirdupois, same as No. 754. single for replacements. 
Size, ounces % % % 2 4 H 

Each .45 .49 .58 .68 .95 1.15 1.32 

WEIGHTS, Andrews Decimal Pound, brass in block, from 0.5 to 0.001 lb. with duplicates of the 
0.1 0.01, and triplicates of the o.ooi lb. weights. Adds up to make 1 pound. Especially valu- 
able in testing laboratories where results must be reported in English units perset 14.00 

WEIGHTS, Prescription, according to the United states Bureau of Standards and the New York 
Board of Pharmacy. In box with cover from 4 drains to 1/10 grain, consisting of the follow- 
in" individual weights: 4, 2, 1, Va drams; 2, and > ■• scruples; 10, 5, 2, 1, 5/10, 2 10, and 1 10 
grains .per set 4 00 

WEIGHTS, Prescription, from 2 drams to V-j grain, the drain and scruple weights of brass, 
min shaped, the grain weights of nickel perset 1.10 

WEIGHTS, Troy, brass, in hardwood block, adjusted to meet requirements of the Bureau of 
Standards, Tenth Annual Conference on Weights and Measures. Weights below *4 ounce fur- 
nished in pennyweights and grains unless otherwise specified. 

No. * A 

Size V> grains to, ounces * 

Per set 2.20 

WEIGHTS, Troy, of aluminum, square, from V, grain to 10 grains, in pasteboard box. 

such that they may be picked up readily perset .90 

WEIGHTS, Troy, from Ms grain to 5 grains in pasteboard box. Bent from aluminum wire, m 

shapes convenient to handle perset 

47 



B 

2 

3.45 

iShape is 
.90 

in 

.80 












BALANCES 



\TH.\l, SCIENTIFIC CO., CHICAGO, I 8. A 




4T] 



No. 771. 



' 






No. 770. 



No. 788. 



Nos. 800-802. 



NO. 792 



WEIGHTS, ORDINARY GRADE, FOR COURSE WEIGHING 

77m. WEIGHTS, Avoirdupois, Iron, sealed, in rn sts. These weights arc the highest qualit; 
produced in this style of weight and aw well finished and nickel-plated. 

No. A » C D 

Siz< ! I 02 to. lbs 1 2 4 

Per set $2.60 3.40 4.75 7.00 



77.'. WEIGHTS, Avoirdupois, Iron, sealed, same quality ;«> ■'»■"•■ «', single for repl ta 



Size, ounces ... } \ 



i . 



• i 



i 



■ 



IViti n 



Each 35 .35 .35 .40 .40 .50 

77 k WEIGHTS. Avoirdupois. ..t' iron with ring handle. 



12 4 8 

.55 .85 1.40 2 



Size, pounds 

Each 



1 
.90 



2 

1.20 



5 

1.50 



10 

2.75 



778A. WEIGHTS. Metric, Universal. Thes weights are of brass, finely finished, and are of 
:i high degree ol accuracy They are provided with a hook al the top and an eye 
in iii. bottom, which Lb concave so that the weights can be stood upright on 
platform balance This is a distinctly high grad< Bet of weights and will be found 
of great value in physical laboratory experiments, as well .-is i'«.r g«m r.-i I weighing. 
The set consists of nine weights ranging from 10 gram- t<> ] kilo, with duplicati 
of tin- 20 and 200 gram pieces 5.75 

778B BLOCK, of hardn I. with holes to take No. 778A sot <>i u.i-l.ts 1.40 

780. WEIGHTS, separate, same a- No. 778. 

Size, grams 10 20 50 100 200 500 1000 

Each 30 .35 .60 .65 .70 .90 1.25 



No. 778A. 



7sv WEIGHTS. Metric, Iron, in nests, carefully adjusted. Sets have duplicates of 20, 

200 :in<l l'i'iio grams. The 10 kilo weighl supplied with bandli 

No \ 

Size 5 grams to, kilns 1 

Per set 2.70 430 



B 



C 
5 

0.00 



790. WEIGHTS, Metric, Iron, Single, same as No. 788, foi replacements. 

Size, grams .. . 5 10 20 50 100 200 500 Kilos 

Each 12 .12 .13 .20 .22 .27 .45 



1 
.70 



2 
1.60 



5 

3.20 



792. WEIGHTS, Metric, Iron, Slotted, w«th bolder. Set consists of mm ."ion, five 100, mm 10, two 20 
:»'"' one in gram weights. Tht-.sc weights will fit No. 798 Weight Hangei fisted below. 



Per set 



4.00 



794. WEIGHTS, Metric, Iron, Single. Same as in No. 792. Specially valuable in connection with 
No. 798 Eangei for use i" Physics experiments with simple machines! forces, etc. 

Size, grams 10 20 50 ioo 500 

Each 18 .20 .40 ,45 .65 

WEIGHT HOLDER, only, of No. 792. Useful for holding No. 794 weights 35 

WEIGHT HANGER, for Xo. 794, weight 50 *rams, capacity, 1500 grams 40 

WEIGHTS, Metric, Iron, Slotted, for use with hanger No. 802 in experiments with Sonometers 
} <>ung s Modulus, Hooke's Law, Torsion, etc. 

Size, kilos 1/ 1 a c 

Each 45 .60 1.00 2.40 

802. WEIGHT HANGER, for use with No. 800 Weights, of iron with hook; weight, 1 k.lo; capacity, 

- U kllos 90 

48 



700. 
7i»s. 
800. 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BALANCES 




No. 810. 




No. 816. 






No. 811. 




No. 812. 




No. 822. 



No. 820. 



No 826. 



BALANCE ACCESSORIES 

810. BALANCE BRACKET ox support, with drawer and key, for attachment to wall where it will be 
out of tin* way and less exposed to vibrations. Size of top surface, 60 x 35 cm, with raised 
edge $11.00 

812. BALANCE COVER, of good quality rubber eloth. A very convenient protection to balances 
Made to order to fit any balance. When ordering, phase give extreme outside dimensions of 
balance case 3.00 

814. BALANCE DESICCATOR, triangular in shape to Ht in corner of balance case. Of glass, 2 inches 
on a side, 1 [-2 inrhrs high -80 

816. BALANCE LEVEL, circular brass frame, spirit filled; diameter 25 mm 6.00 

820. BALANCE READING GLASS or magnifier, to place before indicating scale to facilitate rapid 
readings; on adjustable support 7.00 

822. BALANCE RESTS, glass, to place under the leveling screws of balances each .18 

824. BALANCE WATCH GLASSES, counterpoised, accurately adjusted for analytical work. 

Diameter, nun 62 

Per pair 60 

826. BALANCE WEIGHING SCOOPS, of aluminum, with lip and counterpoise. Accurately adjusted. 
Size B holds about 12 gms of wheat flour, size C about 50 gms. 

No 

Capacity about, cc . ■ 

Bach 



73 
.60 



A 


B 


C 


10 


30 


125 


1.50 


L80 


2.00 



49 






BALANCES 



OBNTBAL SCIENTIFIC CO., CHICAGO, U. S. A 





CiNIIUl SCIENTIFIC C 




No. 838. 



No. 828A 



1 



/ 



I 




No. 830. 



>- 



No. 842. 



No. 840. 






fs V , 





No. 836. 






No. SMB. 



No. 8MD. 



No. 856. 



828A. BALANCE WEIGHING SCOOP, of glass, il.-.t l...tt..m with spiuit. Length, «"-7 mm $0.70 

83H. balance WEIGHING SCOOP, of German silver, with long spout and counterpoise, as used in 
Bugar analysis. Diametei of scoop, 80 mm, length, including spout, 120 mm; depth, 40 mm. 
Highlj polished with brass counterpoise. (See Browne's Handbook of Sugar Analysis, page 
203. i mm 6.00 

836. BALANCE WEIGHING TUBE SUPPORT, nickel plated, foi horizontal or vertical use... 3.00 

838. FORCEPS, foi use with sel of weights; bras with curved points; ivory tipped, heavily lacquered. 
Lengt 1 1 over all, 95 mm 1 00 

84n. FORCEPS, of brass with curved tips. Length, 95 mm 25 

842. WEIGHT BLOCK, of polished <w 1, with sliding cover, empty, with separate compartments for 

holding fractional weights Nos. 712 and 748. Conv.ui.nt for pla.in- m balance case... 1.00 



Sr.4 



856 



85s, 



BALLOONS 

BALLOONS, Glass, very thin for weighing gases. Capacity, about 2.50 ce. 

Style B d 

Each • 2.00 2.80 

BALLOON, Glass, Dumas Type, for di-tiTininiii- the specific gravity of vapors. Of very thin 

blown glass. Capacity, about 200 cc 30 

BALLOON, Rubber, pure gum, diameter about 5 cm each .05 

per dozen .50 
50 



CENTRAL SCIENTIFIC 00., CHICAGO, U. S. A 



BAROMETERS 




SO.70 
M in 

DUB, 

- 
6.00 

3.00 

red. 
1.00 

.25 

or 
10 



S72. 



87G. 



D 

1.80 

bin 
.30 

.05 



B77. 

8NU. 




No. 872. 




No. 876. 



No. 880. 



BAROMETERS 

BAROMETER. Aneroid, Demonstration Form, English and Metric Scales, a very useful instru- 
ment which should be in every laboratory in which the principle of the barometer is taught. 
Iiy simply Mowing in or drawing oui the air by means or a rubber tube the effect of the atmos- 
pheric pressure upon a barometer is clearly demonsl rated. Tins barometer is handsomely 
mounted and finished and makes a very accurate instrument for daily barometric observations, 
Graduated from 28 to 31 inches by 0.05 inch divisions and 715 to 800 mm l>\- l mm divi 
sinus $15.00 

BAROMETER, Aneroid, English and Metric Scales, with weather marks arranged for sea level 
readings. This instrument is provided with an adjustment which renders it suitable for use in 
any location from sea level to 3.500 feet elevation. 

Tin* adjustment is very simple and no derangement of the working parts is accessary. Once ad 
justed foi a given location by the observer, no further adjustment is required. A list showing 
altitudes of Meteorological Stations in the United States is furnished with each barometer, and 
al so :i simple weather forecast card. 

To adjust the barometer for altitude* for a given city, town or location, turn the brass plate set 
in the back of the ease (this is easily done with the fingers) until the number of feet eorres 
ponding t<> the elevation of the city or town is opposite the arrow. The band will then point 
to the proper weather mark and the reading will be the same as that of the U. S. Weather 
Bureau, which is Sea Level Beading. 

Spun brass case, S inches in diameter; enameled dial; adjustable stationary hand for marking 
tin- last position of the movable hand. Range, 26 to 31 inches by 0.02 and 650 to 790 mm by 
1 mm ■ - 15.00 

BAROMETER, Aneroid. Same as No. ^i, but with dial graduated from 22 to 29 inches, for use 
in altitudes between 3,500 and 7,000 feet. With English and metric scales 18.00 

BAROMETER, Aneroid, English and Metric Scales, as adopted by the United states Navy. An 
accurate instrument with practically all parts constructed of hod corrosive m-taU such as 
nickel-silver or phosphor bronze. Tin- dial is of silvered metal with open center. Ct is divided 
with ijrrat accuracy in both inches and millimeters from 26 t<» 31 inches by 0.02 inches and from 
6.lo to 790 millimeters by 1 millimeter divisions. Tin- movement is extra-grade, compensated 
for temperature changes, thus insuring accurate readings of barometric pressure at all thin 

Tin- rase is of larqurred hrass and is five Inches in diann-tcr. For altitudes u\* tu 3,500 feet. 
■ 20.00 



51 



■ 



















BAROMETERS 



I BNTRAL SCIENTIFIC 00., CHICAGO, U. B. A 




No. 88L 



No. 886 



8S1. BAROMETER, Aneroid, English and Metric Scales. Brass case, 5 inches in diameter; open en- 
ameled dial; visible works. Graduated from 26 to -'-l inches is divisions of 0.02 inch, and from 
650 to 790 mm by 1 mm. For use in altitudes up to 3,500 feet $10.00 

881A BAROMETER, Aneroid, similar to No. 881, but with dial graduated from 23 to 29 inches, for use 
in altitudes between 2,000 and 7,100 feet. With English scale only 16.50 

882. BAROMETER, Aneroid, I inch card dial, open face, nickel-plated case. Graduations in both 
English and metric systems. For altitudes up t«» 3,000 feet. Without altitude scale. Rang*', 
27 to 31 inches by 0.05 and 690 to 790 mm by 1 mm 5.00 

884. BAROMETER, Aneroid, pocket mountain type, watch case form, l-' : , inches in diameter, highest 
<iu:ility, compensated for temperature, silvered metal dial, revolving altitude scale, in gilt case. 
Enclosed in neat morocco ease. 

No A ' C 

For altitudes up to, feet 3,000 16,000 

Size of divisions, feet 10 100 

Each 30.00 32.00 

886. BAROMETER. Aneroid, Surveying, especially desig 1 and constructed foi the purpose of readily 

ascertaining slight variations in gradients, levels, ,-te. I'.e-ides extreme sensitiveness, the 
specialty claimed tor this instrument is an arrangement of the seal. • «.t altitudes which admits 
of subdivisions by a vernier, Compensal d for temperature ehaiiyes and reads to two feet of 
altitude scale. 3 inch bronze metal easi , silvered metal dial, with vernier scale moved by rack 
work motion, reading lens arranged to traverse the entire circle, altitude scale 6,000 feet, in 

solid leather sliug case. Weight, 38 ounces 80.00 



52 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BAROMETERS 



o 




* s \l 



*/: 




ien en- 
j from 
S10.00 

ut US* 
16^0 

botk 

lange, 
5.00 

.■],- it 
ease. 

C 

100 
12.00 

ttdily 

, the 

limit- 

•el of 
rack 

,t, i" 
80.00 



CENT 

5CIEHTIFI 

PAT HOY. 21 01| 



890. 



4 



891. 



[I 



No. 890. 



BAROMETER, Mercurial, Cenco, Fortin Principle. Has straight 
glass tube of heavy wall and uniform bore and is provided 
with a screw adjustment for changing the level of the mercury 
in the cistern. The scales are readable by means of a vernier 
to 0.1 mm and 0.005 inch. The lowest possible reading is 
25 inches (63.5 cm), so that the barometer is not satisfactory 
for altitudes above 4,000 feet. (See No. 891 for a high 
altitude barometer.) Complete with thermometer having both 
a Centigrade and a Fahrenheit scale $30.00 

BAROMETER, Mercurial, Cenco. Same as No. 890, but with a 
scab- reading down to 20 inches (00.8 cm). For use in alti- 
tudes up to 10,000 feet 35.00 



894. BAROMETER, Standard Mercurial, United States Weather 
Bureau Type, Fortin Principle. This barometer is of the 
highest type of excellence, indorsed by the United States 
Weather Bureau and fully warranted by the manufacturer. 
The mercury tube is inclosed in a brass body with gun-metal 
finish, having at its upper end two vertical openings, in which 
the vernier works, the latter operated by a rack and pinion 
movement. The readings are taken through these openings, 
aided by light reflected from a white opaque glass reflector 
attached to the board behind. Tin- scale is graduated on one 
side in inches and lOths, and «.n the other in centimeters and 
millimeters, the vernier enabling a reading to be taken, in 
each ease respectively, of one thousandth of an inch and one- 
tenth of a millimeter. The attached thermometer consists of 
a well seasoned tube with both Centigrade and Fahrenheit 
scales, with the figures etched on the stem. It is so mounted 
that it can easily be removed for testing, etc. Reads down to 
L'.">'_. inches (64.8 cm) and is therefore not satisfactory for 
altitudes above 3,500 feet. 

Complete with board back of finely finished hardwood, to which 
is attached a brass bracket to receive the ring in the top of 
the barometer, a ring with steadying screws to clamp about 
the cistern, and white opaque glass reflectors forming a trans- 
lucent background for reading the instrument 71.00 



895. BAROMETER, Standard Mercurial, United States Weather Bureau Type. 

Same as No. 894, but without the board back 60.00 

896. BACK only of No. 894 Standard Barometer 11.00 

898. BAROMETER, Standard Mercurial, United States Weather Bureau Type. 

Same as Mo. 894, but with a scale reading down to 20 inches (50.8 cm) 

for use in altitudes up to 10,000 feet 92.50 

899. BAROMETER, Standard Mercurial, United States Weather Bureau Type. 

Same as No. 898, but without board back 80.00 

900. BACK only of No. 898 Standard Barometer, described under No. 894.. 12.50 



No. 894. 






BAROMETERS 



CENTRAL SCIENTIFIC CO., CHICAGO, i T . B. A 

























No. 908. 

908. BABOMETER, Recording (BarogTaph), in mahogany ease, with class top and sides, and storage 

space for charts. 

Thi 
phe 
rec 

iu.i\ 

for a year, pea and ink 

qoq BABOGBAPH OHABTS, for No. 908 Barograph. In boxes containing one \ ear's supply. 

per box 3.00 

Note:— In ordering Barograph charts, to insure lit it is necessary to » ud in a sample of the kind 

in list-. 

920. INK. purple, for Barographs and Theraograi hs per bottle .55 




$50.00 





No. 922. 



No. 926. 



No. 928 



■ 



No. 932 




No. 934 



922. BAROMETER TUBE, unfilled, large bore, thick wall, one end sealed. Length. 80 tin 50 



924, 

926 
928, 



930. 
932. 
934. 



BAROMETER TUBE, unfilled, same as No. 922, with -lass meivniv well and pipette for filling 
" 70 

BABOMETER TUBE, unfilled, aame as No. 922, but graduated in millimeters 2.00 

BAROMETER TUBE, Demonstration Form, unfilled, with tunnel top and with stopcock at top 
and bottom for easy filling and emptying of tin- tube. Total length, 1U4 cm. Graduated from 
100 to 78<i nun in millimeter divisions 6.00 



MERCURY WELL, japanned iron. Capacity about "n ec. 

BAROMETER TUBE, Siphon Type, unfilled, with bulb on short arm. Length, 80 cm 



.55 
.60 



BAROMETER TUBE, Siphon Type, Bunsen's, unfilled. Graduated at the top of each arm in 
millimeter divisions 4.00 

BASAL METABOLISM APPARATUS, see page 533. 

51 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BATTERIES 



■dituip 

tfcata* 

htm ik 

ban*. 
itb chart* 

... $50.9) 

plv. 

ox Mo 

I the km,! 



tie & 



.50 

nil 
.70 

2.00 

t top 

from 

6.00 

.55 
.60 

ir m in 
1.00 





No. 940. 



No. 946. 



No. 9-48. 



No. 958. 



940. 

ML 
942. 

1084. 

944. 
8040A. 

946. 



948. 

949. 
950. 

951. 
954. 

958. 



959. 
960. 
961. 

8040C 



BATTERIES, PRIMARY 

BATTERY, Bunsen, for open circuit work. A powerful two-fluid cell of about L.9 volts E. M. F. 
ami 1.86 ohms internal resistant An excellent cell for operating induction coils, motors, etc., 
and for electrolysis of water. Quart size, complete without chemicals $2.30 

CARBON for No. 940 • - 12 

ZINC CYLINDER with binding post for No. 940 125 

CLAMP tor Mo. 941 Carbon, with binding post for wire 3 <> 

POROUS CUP, 2x4 inches, for No. 940 30 

GLASS JAR, 4x5 inches, for No. 940 35 

BATTERY, Burn-Boston Addwater. A battery containing an exact balance ■>! active elements, 

zinc, carbon, and salt solution. 
In <lr\ cells destruction of the elements goes on continuously, whether used or not In the Burn 

I',. .st. in this process is arrested while the current is not being used. 
The zinc shell, being insulated from the electrolyte, cannot be acted upon by it. Kxeept for a 
pin hole vent the cell is tightly sealed. All sources of leakage are thus done away with. 

Distinctive Features. 

(1) Yields from three to twelve times the service of dry cells. 

(2) Will never leak or burst. 

(31 Can be stored, fully charged, for any length of time and in any climate. 

(4) Will yield all of its phenomenal electrical content whether the period ot use is three month* 

or three years. , Qn 

Size, 7'-_.xL'n 1(XL mi „. inches; voltage, 1.5 volts; amperage, 20 amperes WW 

BATTERY, Carbon Cylinder, for up«-n circuit work. Well adapted for all telephone and beU 
service. Initial output, 1.4 volts, 6 amperes. Cell complete with chemicals 1-40 

CARBON lor No. 948 

08 
ZINC ROD with binding screw for No. 948 

-in 
GLASS JAR for No. 948 

BATTERY, Daniell, quart size. Consists of No. P3397 Copper, No. F3398 Zinc, No. 944 Porous 
Cup ami No. 8040A Jar. An excellent battery for demonstration use with constant L. M. *. 
of about 1.08 volts. Complete without chemicals 

BATTERY Daniell, gallon size. This has been the standard cell for many years for open or 
closed circuit work. The best for all laboratory work in electrical measurements. Next to the 
standard cells, it gives the most constant E. M. F., about 1.08 volts, which remains the same 
during the life of the cell. Internal resistance from 2 to 5 ohms. With new form riveted 
copper pocket for holding copper sulphate crystals. Complete without chemicals 2.75 

COPPER, New Form, with riveted copper pocket, for No. 958 

ZINC, weight about two pounds, with binding screw attached, for No. 958 50 

POROUS CUP, 3x7 inches, for No. 958 

GLASS JAR,, 6x8 inches, for No. 958 

55 



BATTERIES 



CENTRAL SCIENTE U CO., CHICAGO, V. B. A 






"ED LMll 

COLUMBIA 



v>- 



"Klfcu/CAW*' 






No. 964. 



No. 966A-B. 



No. 97t>. 



No. 980. 






9tf4. BATTERY, Dry. Columbia, Red Label No. 6. Tin best ■!> cell OB the market. K. M P. on open 
circuit, 1.5; maximum :iiMprrau«' f 4 to G; E. M. F. after delivering 'j ampere for thirty minutes, 

L36 • $0.45 

BATTERY, Edison Primary, the latest development, embodying all the good features of ami many 
improvements in the class of cells formerly known as the Edison Lalande and later as the Edison 
Bsco Battery. The elements are the same as in the earlier types but the efficiency and effec- 
tive capacity have been greatly in<i..ised by a better proportioning of active materials and by 
an improved method of suspension. These cells are the best type of wet cell for euntimmm 
service because of their very low interna] resistance and ease of renewal of exhausted parts. The 
iirw type of e«'ll is contained in glass jars made of the new heat resisting glass, which possesses 
also greater mechanical strength than the porcelain jars formerly supplied. In selecting cells 
foi laboratory use, it is important to select a sufficient number to secure the neceesary voltage 
and t<> select those of size and capacity great enough to deliver current at the proper rate, as 
the larger sizes have very low internal resistance and long life and consequently operate at lowest 
maintenance cost Initial E M. P., 0.95 volts, <lecreasing to about O.GG on average load. 



fM>b\ 

!Mi7. 
D76. 



Distinctive Features. 

(1) E M. F. constant through life of cells. 
I 2 » Simplicity and ease oi renewal. 

Visible indication of approaching exhaustion. 
(4) Uniformity of units. 

Long life and service. 

(6) Kntire ubst-nre of local action. 
(7 i Low maintenance cost. 

Number j^ 

Type 202 

Size over all, inches 3%x<>xll 

Average internal resistance, ohms o.Oo 

Capacity, ampere hours 200 

COMPLETE CELL 



c 

402 
5%x6%xl2Y* 

0.O4 
400 

5.00 

2,50 



977. 

978, 

8040C, 

980. 



981. 
982. 
983. 






3.30 

COMPLETE RENEWAL 1-90 

BATTERY. Gravity, Crowfoot Type, especially adapted for closed circuit work. Standard tvpe 
for telegraph companies. E. M. F. about 1.1 volts; internal resistance from 1 to 5 ohms. Gal- 
lon size, complete without chemicals «\q 

COPPER for No. 976 1( - 

- .15 

CROWFOOT ZINC, with connector, for No. 976 50 

GLASS JAR, 6x8 inch s, for No. 976 '^ 

BATTERY, Grenet, French Type, pint size. Most convenient form for use on lecture table riv- 
ing very powerful current for a short time. The E. M. F. is 2 volts at the start. Small inter- 
nal resistance. Height of cell 8 inches. Complete without chemicals 3 go 

CARBONS for No. 980 

ZINC for Xo. 980 

GLASS JAR for No. 980, complete with brass ring 1 9n 

56 



each 



.12 
.40 



1013. 

mi 

1016. 



' 









CENTRAL SCIENTIFIC CO., CHICAGO, U, S. A. 



BATTERIES 




No. 1016. 





No. 1002. 




IIIOO. 



1001. 
10OL\ 
1003. 

1004. 

100.-,. 

1006. 
1008. 



1011. 

1012. 

1013. 

1014. 
1016. 



1017. 
lois. 
1019. 



No. 1008. No. 1000. 

BATTERY. Cenco Plunge. Single Cell. A powerful, compact form of the bichromate battery, ex- 
pressly designed for laboratory and lecture table work. Elements can be quickly lifted out of 
the solution when not in use. Fiber top, with nickel-plated brass trimmings. Large zinc and 
carbon elements placed close together, reducing the internal resistance to a minimum. Initial 

E. M. F., about 2 volts; internal resistance when freshly charged, 0.13 ohms $ 4.00 

BATTERY. Cenco Plunge. Two Cells, in case with handles 10.00 

BATTERY, Cenco Plunge, Four Cells, in case with handles ., 18.50 

BATTERY, Cenco Plunge, Six Cells, in case with handles 27.00 

CARBON PLATE for Cenco Plunge Battery, 4x3xVi inches 35 

ZINC PLATE for Cenco Plunge Battery, 4y H xtxV 4 inches 50 

GLASS JAR for Cenco Plunge Battery, 4x4x8 inches 65 

BATTERY, Laboratory Plunge, Pour Cells. Similar in construction to the Cenco Plunge Battery 
described above, the essential difference being in the elements, which are larger, and the case, 
which has :ui easy lifting motion, with a deadfall catch not liable to slip. The elements am 
quickly removed from the solution. Each cell may be usid singly, two or more in series, or in 
parallel. Any nil which is not required for use can be suspended by the hook from the axle. 
All parts are interchangeable. Unquestionably the best battery for the lecture table. Initial 
E. M. F., about 2 volts per cell; internal resistance when freshly charged, 0.15 ohms. Complete 
wit h ease 22.75 

CARBON PLATE for Laboratory Plunge Battery, 6 1 / J x2%x 1 / t inches 60 

ZINC PLATE for Laboratory Plunge Battery, 6^x2^x14 inches 60 

ELEMENTS COMPLETE for Laboratory Plung.- Battery. Two carbon plates, zinc plate, fiber 

top, bin. ling posts and hooks 2.75 

GLASS JAR for Laboratory Plunge Battery, 2%x4 Vix7 inches 60 

BATTERY, Samson No. 2. A popular battery for open circuit work. It is the best, most durable 
and effective of all cells of the carbon cylinder type. Recuperates very quickly. Dimensions 
over all, 4V>x4 1 />x8 inches. E. M. F., 1.5 volts. Internal resistance about 0.07 ohms. Complete 

with chemicals 2.75 

CARBON, for Xo. 1016 1.50 

ZINC CYLINDER, for No. 1016 70 

GLASS JAR, for No. 1016 .' .75 

57 






BATTERIES 



CENTBAL BCIENTIPIC 00., CHICAGO, U. 8. A 







No. 1028. 






L026. 



1027. 
L028. 

1032. 



n 



No. 1032. No. 1036A-D. No. 1036E. 

BATTERY. Standard Cell, -lass pari only, with platinum wires, for those desiring to make thi 
own standard cells. This is the r< gulai H ' and may be used to make anj ol the ordinary 

. ..ii oi.ou 

forms ol standards q n 

BATTERY. Standard Cell, glass pari onlj . without platinum wires •■« 

BATTERY. Standard Cell. *:nne a* No. I (>2<>, on stand as illustrated So0 

BATTERY. Standard Cell, Student Type, se< page ->v 

BATTERY, Standard Cell, Weston, unsaturated type, Model -l. Consists ol an 11 Bhaped recep 
tacle with platinum leads which pass through the bottom. One limb oi the cell """ : "';; jad 
, m . in. amalgam; the other mercury and a pasts of mercurous sulphate. The •■••ll is t.i .-. to 
slightly above its cross arm with an unsaturated solution ol cadmium sulphate and sealed to 

prevent evaporation. Porcelain separators prevent the ingredients from I mini: nnv.1. E. 

M. r. betwi ••ii 1.0184 and 1.0189 volts, With manufacturers' certificate of voltage.... 25.00 

BATTERY, Standard Cell, Weston. Same as No. H»:{2, hut with Bureau of Standards certificate. 

.............. L-J.oU 



BATTERIES, STORAGE 

BATTERIES, Cenco Storage. These batteries, which are made for us bj of the most reliable 

manufacturers, have been used extensively for years with increasing satisfaction in all classes ol servi. 

The different sizes in each class have tin- same plat ustruction, the onlj difference being in the si 

and capacity of the plates or elements, The voltage is approximately two volts at the beginning of 
discharge. Bach battery is guaranteed againsl electrical or mrrhanica] defects, and within the dis- 
charge rates specified thej will give their full rated rapacities. Wlu-n charged at the normal rate given 

c tl.r cells will be charged in '•' hours. Full directions will be Bent with each 



for B hour discharge i al 

battery for its charging and proper care. 



No 


\ 


B 


c 


D 


E 


F 


G 


H 


J 


K 


L 


No. of iilatea 


■ > 


•• 

— 


— 


g 


5 


7 


9 


7 


9 


11 


i,; 




i 


5 \ 5 


7x5 


B%x5 


~)%x6 5%x6 


5%x6 ! 


. n7 •-, 


7 :1 ,n7'- 1 


7%x7% 


7%x79j 


Output at normal disrhai^i' 


























8 


16 


21 


32 


G4 


96 


128 


180 


240 


300 


360 


( lharging rate, amperes, . , 


1 




— 


3 


4 


8 


12 


16 


22% 


30 


37 % 


45 


Discharge rate for 8 hom s, 


























l 


2 


3 


4 


8 


12 


16 


22% 


30 


37% 


45 


Discharge rate for 5 hours, 




ampi'ivs 


1% 


3 


4% 


6 


10 


15 


20 


30 


40 


50 


60 


Length of jar, inches 


2% 


2% 


L'-s 


2% 


4 :t , 


'i"'s 


7% 


'I''. 


8 


8% 


IP, 


Width of jar, inches 


3% 


7\ 


:•, 


7', 


7% 


7% 


7% 


9», 


9 % 


91 s 


9% 


Height of jar, indies 


.;>.. 


!' 


12 


L2 


9% 


'.".. 


9% 


12 


12 


12 


12 


Wright of cell, complete 
























with electrolyte, lbs 


4 


7% 


11 


i::i , 


30 


39 


49 


51 


63 


79 


96 


1036. COMPLETE CELL, 
























without electrolyte 


2.35 


3.80 


4.15 


4.60 


11.40 


15.15 


18.30 


21.45 


26.40 


31.80 


38.80 


1037. GLASS JAR, only 
























Each 


.65 


1.85 


1.85 


1.85 


3.15 


3.85 


4.00 


4.80 


5.10 


6.00 


8.60 



MM 



;,s 



CENTRAL SCIENTIFIC CO., CHICAGO. U. S. A. 



BATTERIES 





No. 1040. 



No. 1042. 




No, 7698. 



BATTERIES, Cenco Portable Storage. These batteries are of the same general type as the Cenco 
Storage Batteries described on the preceding page, but are especially m-ale to stand transporta- 
tion. Under ordinary conditions they should last for at Least five years, and they are guaranteed 
fur one year against everything except abusive handling. The jars are of the best vulcanite, and 
are enclosed in hardwood cases provided with a handle and finished with arid-proof paint. 
Strength is added to the jar when placed in the rase by entirely surrounding it with an elastic 
sealing compound. Short circuiting is prevented by an exceptionally wide distance between 
the plates. The acid cannot spill under any ordinary conditions of service. Batteries are 
charged ready for use. Initial E. M. F M 6 volts. 

No " A B C D 

Output at normal discharge rate, ampere 

hours 40 60 80 120 

Charging rate, amperes 4% 6 7 8 1 - 

Discharge rate for S hours, amperes 5 7% 10 IS 

Length, inches .' 8% 10 11 14% 

Width, inches 5 6 7 7^4 

Beight, inches 9 9% 9% 9% 

Weight of cell, complete with electrolyte, lbs 23 35 45 in; 

1 «■ 40. COMPLETE CELL, charged $22.50 29.00 30.00 43.00 

BATTERIES, Cenco Sealed Storage. These batteries are contained in glass jars, sealed with a 
smooth and strong compound, and are ideal for isolated and portable work where eare in hand- 
ling may be given. They are especially desirable for clock and bell systems, and for demonstra- 
tion work. Each cell is made up with a negative plate on either side of the positive, giving 
equal action on each side and preventing buckling and sulphation. The sealing compound pre- 
vents evaporation of the electrolyte and keeps the cell (lean at all times. The batteries are 
shipped completelv assembled and charged ready for immediate use. Initial E. M. F., 2 volts. 

No . A B C D 

Output at normal discharge rate, ampere 

hours 8 16 44 66 

Output at intermittent rate, ampere hours 12 23 65 !» ■» 

Charging rate, amperes l*/4 2V 2 5 

Discharge rate for H hours, amperes 1 4% 

Number of plates per cell 3 5 5 

Length, inches 4 4 6^4 6*4 

Width, inches 2% 2V 2 3 3 

Height, inches 6% 6% 9% »% 

Shipping weight, complete with electrolyte, lbs... 10 11 18 

1 042. COMPLETE CELL, charged 5.00 6.25 9.40 12.00 

7698. BATTERY TESTER, or Syringe Battery Hydrometer. A very convenient form of battery 
hydrometer, which eliminates the spilling of acid when making a battery test. The pointed tube 
is inserted into the battery and the electrolyte drawn up into the hydrometer containing tube 
by means of the rubber bulb. After the reading is obtained the fluid is ejected back into the 
battery. Complete table showing relation between specific gravity and battery strength in- 
cluded 70 

59 






BATTERIES 



CENTB 



ai, SCIENTIFIC 00- CHICAGO, 0. 8 \ 
















No. 104°,C 






No. io:ua. 



Plates of No. 104ti<j. No. 1048E. 

BATTERIES, Edison Storage. These batteries are composed <>f negative plates of iron oxide and 
positive plates of nickel oxide immersed in an alkaline solution. The retaining cans are of 
corrugated sheet steel, welded at the srams, :« n«l electroplated with nickel, which protects the 
steel from rust and gives each cell an attractive appearance. They air made in two types: Type 
"A" for heavy current duty; Type "B" for lighter work, Buch as for ignition, small lighting 
outfits, clocks, bells, etc. These batteries are guaranteed for five years if directions are care- 
fully followed. Voltage on open circuit, 1.2. 

DISTINCTIVE FEATURES. 

Light weight and small space occupied. Freedom from obnoxious fumes. 

No sulphating or deterioration on open circuit. No injury from Bhort circuits. 

No breakage of containers. Low maintenance cost. 

Extremely long Iit'<' in service. 

Freedom from b< nsitivcness to external conditio! such as temperature, vibration, concussion, etc. 

Number \ B C D E 

Type Hill B-2 B-4 B-6 A-4 

No. of positive plates I - 4 6 4 

Output ,M normal .li- hai j*. • rate, ampere hours 1875 37.5 75.0 112.5 I ■"." 

Charging rate, amperes. 1.75 7.5 15.0 :sit.n 

Discharge rate for 8 hours, amperes 2.25 1.75 9.5 14.0 18.5 

Discharge rate for 5 hours, amperes 1.75 7.5 15.0 22.5 30.0 

Mean effective internal resistance, ohms 024 012 i .004 103 

Length of jar, inches I 55 1.55 2.58 3.75 2.64 

Width of jar, inches 5.03 5.n:>, 5.09 5.09 5.13 

Height of complete cell, inches 10.44 8.69 vr,;> B.78 13.38 

\Wight of renewal solution per cell, lbs.. l'.o m 1.7 2.5 2.9 

Weight of cell, complete with electrolyte, lbs 4.0 4.7 7.5 10.8 in.o 

1048. CO MPLE TE CELL, with electrolyte, but not charged $6 50 8.50 11.75 16.00 20.00 

BATTERIES, Edison Storage, supplied in s ts of Bve, assembled in standard suspension trays 

Contained in a Steel l>atti-ry box. Tin- initial voltage Of each set 1S 6 volts and the direct tin- 
rent vtdtagi- iHTi-ss:irv to <harge is 9. 

No ' A B 

Type . B-2 B-4 

Output at normal discharge rate, ampere hours 37.5 75 

Charging rate, amperes -. . . 7.5 I" 

Weight, ll.s., in trav .'7 41.5 

Height, inches 10V t 10\ 

Width, inches 7 r \ 7% 

Length, inches 1 1 T s 17% 

1050. BATTERY, comp lete in box 47.25 63.50 

1051. ELECTROLYTE for renewal of Edison Storage lotteries. In cans. 

No A B 

No. of pounds in can 2 5 

Per can 1.00 1.90 

60 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S, A. 



BATTERIES 






-.- 



ft 


















. " ' 


■ 


- 




• 


B» 


Ml 


. 


::•: ■ 










B 




&4 




- 





























B 




5 




i* 



BATTERY DIRECTIONS 

Amalgamating. A good method for amalgamating a zinc element is to dip it into acid, then pour a 
few drops of mercury on the surface and rub in with a piece of cloth attached to a stick. This is per- 

imps the beat and quickest method although the most expensive, 

Amalgamating Fluid. 2 ounces mercury, 1 ounce aqua regia, 10 ounces water. Dip zinc into solution 
and then wash with water. No need of brush or rag. Zinc element should be thoroughly cleaned before 
amalgamating by means of a metal scratch brush or coarse emery cloth. 

Bunsen Battery. Outer cell contains amalgamated zinc plate dipping Into dilute sulphuric acid (by 

weight 10 [►arts water to 1 part acid). In inner porous cup, a piece of carbon dins into nitric acid of 
lull strength. Obnoxious nitrogen oxide fumes may be suppressed in a large measure by the addition 
of a sin:.]] quantity of potassium dichromate. If desired the nitric acid may be replaced by a chromic 
id solution. (See Sulpho-Chromic Salt below.) 

Burn-Boston Battery. To make active, ready for use, add plain water. 

Carbon Cylinder Battery. Place 6 ounces ammonium chloride in jar and fill with water to two- 
thirds its capacity. Stir well until the salt is entirely dissolved. Place elements with zinc inside carbon 
cylinder as illustrated. 

Columbia Dry Battery. Should be entirely discarded after its amperage has dropped to a point un- 
fitting it for use, as it cannot be recharged. 

Daniell Battery. The zinc clement is placed in a porous cup containing sulphuric acid (1 part acid 
to 20 parts water, bv weight i. The copper element encircles a porous cup and dips into saturated copper 
sulphate solution, kept continually saturated by the addition of an excess of copper sulphate crystals on 
bottom of jar. Solution is more effective by addition of a few cubic centimeters of sulphuric acid. 

(In our Xo. 9"8 a pocket is provided for holding excess crystals of copper sulphate.) 

Edison Primary Battery, The exhaustion of the cell is indicated by holes appearing in the lower 
part of the zinc plates. When this point is reached, a complete renewal (see Xo. !»67 ) should be obtained 
as the parts are so proportioned that all become exhausted at the same time. Directions are furnished 
with each renewal. 

Fuller Battery. Fill glass jar half full of chromic acid solution made from Rulpho-Cbromic Salt 
(see below), place 1 teaspoonful mercury and 2 tabl*spoons full of eommon salt in the porous cup and 
fill with water to 1% inches of top. The carbon element containing; the porous cup is then placed in the 
glass jar, the zinc is placed in the glass jar and the cover over it. The solution should fill the glass jar to 
within an inch of the top. 

Gravity Battery. This type of battery is merely a form of Daniell cell, where the two solutions are 
kept separate by their difference in specific gravity. Place 2 pounds copper sulphate crystals in bottom 
of jar with copper element. Add clear water to fill the jar when elements are in position. Suspend zinc 
over edge of jar and connect the two plates through a resistance of 10 ohms or more. Whin the solutions 
have separated, that around the zinc plate being colorless, while that around the copper is blur, the cell 

is ready for action. If- during this time the zinc plate has become covered with precipitated copper, it 
should be taken out and brushed off until the surface is bright. The separation of the two solutions 
may be hastened by adding some crystals of zinc sulphate or a small amount of dilute sulphuric add. 

Grenet Battery. In this cell, the zinc plate between two carbon plates dips into a chromic acid solu- 
tion. (See below.) When this cell is exhausted, the rich reddish color of chromic acid will be replaced 
by a muddy dark green color. 

Chromic Acid Solution. There are many different formulae, but the most convenient method of 
making a generallv useful acid is by simply dissolving prepared chromic acid salt in water. (See Sulpho- 
Chromic Salt, below. > 

A useful formula is, 30 parts sodium dichromate, 100 parts water and 23 parts sulphuric acid (sp. 
gr. L845); all by weight. 

LeClanche Battery. Directions furnished under carbon cylinder cell apply to this type of cell ex- 
CCpt that zinc rod is placed outside of porous cup. 

Plunge Battery. Elements and directions under Grenet type apply to this type of battery. 
Samson Battery. Directions furnished under carbon cylinder cell apply to this type of cell. 

Storage Batteries, These cells make the most convenient source of electrical supply, providing the 
i .■•••oratory is equipped for charging. Full directions for use and for charging accompany each cell. 

BATTERY FLUID 

CENCO SULPHO-CHROMIC SALT. (Formula patented.) For making battery fluid for plunge 
batteries and Grenet cells and to replace the nitric acid in Grove and Bunsen cells it will be found 
that Oenco Nulpho-Chromic Salt is without an equal. Its use docs away with all handling of acids in 
liquid form. One jar (2 lbs.) is sufficient for three quarts of battery fluid Per jar $0.80 

61 









BATTERY connectors CENTBAL SCIENTIFIC 00., CHICAGO, D. & A. 




No. 1052. No. 10f>o. No. Hi..! No. 10. r ». r >. No. 10f>6. No. 1057. No. 1059 

















No. 1062. 




No. 1060. 



No. 1064. 




No. 1068. 




No. 1058. 



PRESS 

DOWN 

VlERE 

No. 107UA. 







PRESS 
DOWN 
HF.RE 
No. 1070B. 




PRESS 
DOWN 

HERE 






L052. 
L053. 
L054. 
1055. 
1056. 

1057. 

in.-.s. 

L059. 

IM.III, 

1061. 
1062. 
1064. 
1066. 

IIMiH. 



Illustrations are full size. 

BATTERY BINDING POSTS 

small 



No. 1O70C. 



binding POST, American form, with w I Berew, 

binding POST. American form, with wood Bcrew larei 

binding POST. American form, with n I screw doubl. 

BINDING POST. American form, with maehim 

BINDING POST. Aii 
BINDING POST 
BINDING POST 



screw, small. 



S0.10 
.15 
.20 
.10 



'. American form, with machine screw, large!!!!!! Jr 

• American form, with machine screw, double "' *J« 

. American form, extra heavy with two nuts for attaVhi'ug to'board o, "table tip. 



P 
.90 

.12 



BINDING POST. English form, with machine Bcrew, smali 

BINDING POST. English form, with machin r, u- large 

ISXSJ2 P0ST - l: "- lish form > u !1 '■ machine s. rew. I ,,:,-. .1 ! .^ 1 .1. - J9 

nSSSSSS 1 " ''1 ' Am T a V n A d En .* lish '"»". -th Sacline'scVew!!!!!!! g 

BInSSg POST '"'"' f Tm ' "" , " 1 ;"" '' ■ Amori * '" '""' En * lish > wi,h '"■•" »'"'- ^rew . g 

oiiNuiiNu ^u&t, w itfi plate cor wood screws, double 



1070. BINDING 






INnmrJS f J the , above bindSn e * osts Nos. 1052 to 1068 in lots of 12 ' 
JNDING POST. Spring of braes, Pahnestock Patent. Will take anv six, wire,, 

L?: s i is s i&e A Md i™j<™ii c *i e ™ pi ]i is provided with ■ ^ < •"«*" 

Length, in< his A 

Width, inches "~ 11/1 

- 5 discount " in lots ~of \ ooT " 



.50 
!• t<> No. 10 B. & 

limy l„- soldi- ml. 
A h < ■ 

11/18 H/16 2 1/16 
-06 A 





con 




con 


> 


CO.N 


|#W*i 


CON 




CON 


s 


CON 


• 


CON 




CON 






m 


CON 








CON 



62 



m. cob 


UN] 














■ "•'. TES 


"" TES 


• 


DCS 




CON 


1: 


8* 


BE 




CENTRAL SCIENTIFIC CO., CHICAGO. V. 8. A. 



BATTERY CONNECTORS 






IESS 

lOWN | 
IERE 




fcnimi! 




No. 1074. 



No. 1076. 



a :^T?> 





No. 1084. 



No. 1082. 



No. 1086. 




No. 1090. 




Nos. 1006-9 



No. 1072, 




3 FT 



No. 1087. 




No. 1092. 

BATTERY CONNECTORS niuswcationa are fun size. 
L072. CONNECTOR, Clip, lor holding small electrodes in experimental work on electroplating A small 
American binding post soldered to a spring clip; handle of clip bent to hang over edge of bat- 
tery jar or tumbler . §0.25 

1074. CONNECTOR, double 12 

l()7<>. CONNECTOR, double; one end for wire and other slotted for recen ing plates 16-inch thick or less. 

20 

1078. CONNECTOR, triple 

L080. CONNECTOR, quadruple. 

1082. CONNECTOR, for zinc... 

L084. CONNECTOR, for carbon 

I08fi. CONNECTOR TIP, for use in making tnections with American binding posts 



30 

35 

30 

30 

12 

1087. CONNECTOR, consists of two No. 1086 connector tips attached to ends of 3 feet of flexible silk 

cord .50 

1090. CONNECTOR TIP. Universal, for use in connecting to either English or American binding posts. 

Very convenient. To be sold. 'red to cord .05 

Hi!iL\ CONNECTORS, consisting of two No. 1090 Connector Tips soldered to the ends of flexible silk cord. 
No A B 

Length of cord, inches 6 36 

Each 20 .25 

10% discount on the above binding posts Nos. 1072 to 1092 in lots of 12. 

1004. CORD. Flexible Silk, as used on Nos. 1087 and 1092. For small currents peryard .10 

UNIVERSAL TEST CLIPS. Ti saversinany electrical work requiring quick temporary connec- 
tions, since they may be attached to tin* ends of a connecting wire and used to make connections at 
any point by simply clipping on to binding posts or wire. Made of copper anl may be used over and 
over again. Suggested for use with tost sets, with voltmeter-,, on shop testing devices, as a helix clip, by 
meter departments, in college and commercial Laboratories, on motor and transformer test floors, in motion 
picture projc< tion work and in charging storage batteries. For storage battery work the lead plated clip 
No. 1098 should be specified. 

10!)<5. TEST CLIP. L'O ampere capacity, provided with binding post t''»r attaching wire; spread of jaws. 
% iii. 25% discount in lots of 100 each .20 

1098. TEST CLIP. Same as No. 1096, but lead plated to present corrosion, particularly in storage bat- 

tery work. 25' ; discount in lots of 100 .16 

1099. INSULATOR, for Nos. 1096 and 1098 Test Clips, of soft rubber. Shown in phantom in the illus- 

tration. 25% discount in lots of 100. .10 

lion. CONDUCTOR, consists of two No. 1006 Test "'lips, attached to the ends of .°. feet of flexible single 

lamp cord. Carrying capacity, 6 amperes -60 

BATTERY JARS, see Jars, Nos. 8040 and S042. 
BATTERY POROUS CUPS, see general heading Batteries. 
BEADS, Glass, see Nos. 7128 and 7129. 

63 






BEAKERS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 













No. 1124. 
No. 1132. 



No. 1126. 
No. 1136. 



No. 1128. 
No. 1134. 



BEAKERS 












The sizes and shapes of boiling glassware and poreolnin li t . . l in this catalog are in accordance with 
the recommendations of the Committee of the American Chemical Society >>n Guaranteed Reagents and 
Standard Apparatus (See 'I"' reports ot \v. 1>. Collins, Chairman, published in the Journal >>t' [ndus 
trial and Engineering Chemistry, Vol. XIII, No. 5, page 402 and No. n, page 1070.) These sizes and 
shapes wor<- adopted by the Association of F?< ientific Apparatus Makers of the United States <<t America 
at a recent coni'iTi-iin- nillr.l i>\ the United States I>epartmen1 oi Commerce at Washington :i- a part of 
the move toward standardization and elimination <»f unnecessary items bow being urged by them upon 
all American industries (For a general statement of our policy in this connection, refer to the foreword 
on page 7.) 

1124. BEAKERS, Resistance Grade, Griffin's low Form, with lip. 

Capacity, cc ",0 10<> 150 250 400 600 800 1000 2000 

Number in original case. . . 190 140 120 160 90 70 70 50 20 

Each $0.12 .13 .14 .17 .20 .23 .27 .36 .75 

Per original case 20.52 16.38 15.12 24.48 16.20 14.49 17.01 16.20 13.50 

1132. BEAKERS, Pyrex Glass, Griffin's low form, with lip. 

Capacity, cc 50 100 150 250 400 600 800 

Number in. original case 216 158 156 168 84 72 48 

Bach 18 .19 .21 .25 .30 .35 .40 

Per original case 34.99 26.67 29. 48 37.80 22.68 22.68 17.28 

Capacity, cc 1000 MOO 3000 3000 4000 

Number in original case 4H g| ] •_> jq i ,, 

Eacn 54 .73 .98 1.40 1.80 

Per original case 23.32 15.76 10.58 12.60 16.20 

1134. BEAKERS, Pyrex Glass, usual tall form, without Up. 

Capacity, cc 100 200 300 400 500 

Number in original case 156 168 144 60 60 

Each 19 .23 .26 .30 .32 

Per original case 26.67 34.77 33.69 16.20 17.28 



U56. 


BEA 




tu 




hv 








Ml 








] 


■ 


BEA 




16 




IE 




to 



64 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BEAKERS 









No. 1140. 



No. 1142. 



No. 1144. 



No. 1150. 



No. 1152. 



No. 1154. 



60 

.32 



1146. 



1150. 



1152. 



BEAKERS. Phillips, aee Flasks, Assay. 

1140. BEAKERS, Sugar, heavy, with lip. 

Capacity, cc 175 900 

Each $0.40 .70 

1143. BEAKER, Heavy, Tumbler Shaped, not for heating. Capacity, 12 ounces. Height, 4*4 inches. 

15 

1144. BEAKERS, Aluminum, with lip. Capacity, cc 125 250 500 1000 

Eacn 40 .50 .60 1.00 

BEAKERS, Copper, with lip. Capacity, ec 125 250 500 1000 

Each 60 .70 .90 1.20 

BEAKERS, Coors Porcelain, glazed inside and outside, with exception of outside bottom surface, 
without lip. 

£°-\ 2 3 3A 4 

Capacity, cc 340 580 700 970 

Diameter of body, mm Gi) ,M2 !>ii 100 

Diameter of rim, mm 74 g7 <i;> 1Q3 

Height, mm ug 243 1M 1G7 

Eac & * 1.20 1.44 1.80 2.16 

BEAKERS, Dye Pots, Coors Porcelain, with heavy supporting flange, glazed inside and outside 
with exception of outside bottom surface. 

No V B C 

Capacity, cc, to level of flange L'ltn 425 1125 

Diameter rim, mm 90 96 127 

Diameter below flange, mm 87 90 115 

Distance rim to supporting flange, mm 42 42 .",s 

Height, mm 128 136 184 

Each 1.44 2.10 3.30 

1154. BEAKERS, Dye Pots, Coors Porcelain, with heavy supporting flange and socket for wooden 
handle, glazed inside and outside with exception of outside bottom surface. Without lip. 
No A B 

Capacity, cc, to level of flange, mm 290 425 

Diameter, rim, mm sii 96 

Diameter below flange, mm 80 118 

Distance rim to supporting flauge, mm 42 42 

Height, mm 128 136 

Each 2.88 3.90 

1156. BEAKERS, Opaque Fused Silica. Griffin's low form with lip. Capable of resisting tempera- 
tures up to about 12()0 C C. continuously, and unaffected by mineral or organic acids except 
hydrofluoric, and phosphoric at high temperatures. Alkalies in solution at low temperatures 
do not affect the ware, but at high temperatures or in fusions readily attack it. Its very low 
coefficient of expansion enables it to withstand sudden changes in temperature. 

Capacity, cc 50 100 150 250 400 

Each 2.65 2.90 3.35 3.95 5.00 

1158. BEAKERS, Transparent Quartz, with lip, prepared from rock crystal. Melting point about 
1600°C. Not attacked by water at room temperatures or at the boiling point. Less soluble 
in alkaline solutions than the best glass. Not attacked by dilute acids except hydrofluoric; 
concentrated sulphuric acid has no appreciable effect at 100°C. 

Capacity, cc 50 100 200 

Each 9.00 15.00 22.50 

65 




BELL JARS 



CENTRAL SCIENTIFIC CO, CHICAGO, P. B. A. 








No. 1160 



No. 1162. 



No. 1161, 



No. 1166. 



No. 1168. 



BELL JARS 



No. 1170. 













All of our bell jars are made of dear glass and we well shaped. All rims are reground in our own 

factory, thus insuring n <: l contact with the pump plate, which is not possible with ordinary grinding 

1160. BELL JARS, High Straight Form. Knob Top. with reground rim. 

X.. A B 

Height, inside, inches 

Diameter, Inside, inchea ' o 

< lapacit v, gallons 

Each ..' S2.20 3.20 

207c discount in original case of 16 8 

1162. BELL JARS, High Straight Form, Open Top. with reground rim and top groun.l ilat. 



1168 



1170. 



No, 



Height, inside, inches 

Diameter, inside, in< hes 

Diameter of opening inches...* 

I Opacity, gallons 

Each 

20' % discount in original case of 



(' 


1) 


E 


15 


15 


18 


7 


fffc 


9 


■J 


3 


4 


4.00 


6.50 


8.75 


4 


3 


2 


op ground tlat. 




A 


B 


C 


9 


11 


15 


5 


6% 


7 


l 


1% 


l 1 ^ 


', 


1 


2 


2.40 


3.20 


4.50 


16 


6 


4 



1164. BELL JAR, High Straight Form. Tubulated Top, t<< take No. robber B topper; with re- 
ground rim. Insid.- height, n inches; inside diameter, 6% in.; capacity, 1 gallon, .each 3.20 
20' c discount in original case of 6. 

1166. BELL JARS, High Straight Form, Tubulated Top, with ground-in glass stopper and reground rim. 



No 

Height, inside, inches.. 

Diameter, inside, inchea 
< Japacity, gallons 



A 

9 

5 

16 

Eac & 2.40 

20',; discount in original case of X6 



B 

11 
6 

1 

3.20 
6 



BELL JARS, High Swelled Form, Knob Top. with reground rim. 

No A 

Height, inside, inches jq 

Diameter, inside, inches c 

Capacity, gallons j 

Each 3 2Q 

207c- discount in original case of {o 



C 

15 
7 
2 

4.50 

4 



B 

12 

7 

2 
4.50 

6 



BELL JAR. Extra High Form, with reground rim, for use with a full length barometer tube in 
studying the effect of reduced pressure on the barometric column. 3.50 



.-,■. 



wt 


BE1 








be: 




R 




SLD 








BE1 


::•'. 


EEL 




«° 


> 


BUZ 


Mo. 


BE1 








at 




til 








BE1 




• 


U96. 


EL£ 




B ( 







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" 


am 


--. 


D 




15 




• 




1 




fcO 


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No. 1172. 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BELL JARS 




No. 1174. 





No. 1176. 




No. 1184, 





No. 1186. 



No. 1188. 



No. 1190. 




No. 1192. 



No. 1196. 



' 



1172. 



B 




11 


IS 


fli 


■ 






1 


• 


120 


il 


6 


J 


• 


..ad 


a 


Njjrouiila 


B 


■ 


11 






• 


6 






i 


1 


• 


Ui 


, 


6 


j 



10 
6 

1 

iO 
12 





:: 






&• 



* 



1174 
1176. 
1177. 
1184. 



1186. 



1188. 
1190. 



BELL JARS, Low Straight Form, Knob Top, with reground rim 

N «. B C 

Height, inside, inches 3% 4 

Diameter, inside, inches 5" q 

Each $1. 60 2 . 20 

«su% discount in original case of 36 28 



D 
5 
8 
3.10 
12 



E 
8 
10 
5.65 
3 



F 

10 

12 

9.00 

2 



1192. 
1196. 



am- 
2.70 



BE ^ J*?' ¥Z SWeUed £** ° per \ Top ' (Hand and Bladder Glass), both rims ground. Di 
eter at the bottom rim, 4% m.; height, 4 in S 

BELL JAR. Capped. No. 11 64 fitted with a brass cap for receiving either" stop-cock' or' a' sliding 
rod. Capacity, 1 gallon. Without stop-cock or rod 6 i.50 

^S^imv^J^n ^ iT en n a '" 1 i ,0 ° k at thC °! her f ° r "'""Ration of apparatus inside 
or ^o. 11 /b Bell Jar. Complete with packing screw, threaded 7/16-16 2.00 

BELLS, Electric, D. C. Iron box, pivoted a. mature. Voltage required, 6 volts; resistance, 6 oh 



I »i;imeter of gong, inches ..1 

Each .■.'.■.*.'.';.*.*;;::;; >o 



ins. 

c 

4 
1.00 



BELLS, Electric D. C, Skeleton Type. Pivoted armature, superior workmanship, nickel-plated 
gong giving cdear, penetrating tone. Voltage required, «J v., Its; resistance, (3 ohms. 



Diameter of gong, inches 'a 

Each ..:.".::::;::;;;:::: 5 .oo 



BUZZER, Electric, D. C. Iron box 



B 

6 
6.50 

.70 




Diameter of gong, inches 3 

Each ' ; 7 55 * 

For TRANSFORMERS for use with No. 1190, see general heading Electrical Instruments. ' 
BELL, Electric, loud ringing, for outside service; entirely moisture proof; operates on 110 volt 
t>0 cycle, A. C. 6 inch gong; 300 ohms resistance ig.OO 

ELECTRIC BELL OUTFIT, consisting of No. 1184A Bell, No. 964 Dry Batterv, No. 1200 Push 
Button, 1 lb. (150 feet) annunciator wire, and staples for putting up 2.6O 

67 



BINS 



CENTBJLL BOIBNTIPIC CO., CHICAGO, V. S. A. 






IL'00. 





No. 1200. 



No. 1208. 




No. 1212. 



PUSH BUTTON, pressed metal, with screw cap 

20'; discount in lots of 12. 
STAPLES, Wire, square top, %-inch, for bell wiring. In 2 oz. packages perpackage 

BELLOWS, Hand, see No. 1380. 








BINS AND CONTAINERS 

1208. BINS or Containers, made of galvanized iron, air and water-tight, with outside fitting cover; has 
a heavy steel band top and bottom, the lower one riveted through body and bottom; concave 
bottom raised 1>4 inches from ground; drop handles. 

aze/inches" [ [\ ]]\ ..'. '.'. \\\ \\ \\\\ \\\ .'..'. ][?."'. V. !". Y.Y. '.'.'.'.'.'. '. H',.x24 19x28 

Capacity, gallons W 

Each 500 

1212. BIN or Container, of heavy galvanized iron, with handles and cover; will hold half-bushel of soil 

or g i a in 

1214. BIT BRACE, Plain, malleable iron socket and shell, forged steel jaws, 8-inch sweep 2.50 

1216. BIT BRACE, Ratchet, with ball bearing head. Ratchet design is new and unique; the pawls are 

strong and positive in action; 8-inch sweep *- -i0 

F1931. BLADDER, prepared and i leaned. For use with bladder glasses to show bursting by atmospheric 
pressure 



32 

8.00 



.15 




Physical Apparatus for 
Educational Institutions 










OOKJU AFT AlATiS 
FOi MICH 5CH00L5 

and jirwoi comas 



Catalog F 







Central Scientific Company 
Chicago 



CATALOG F 

CATALOG F, illustrated here, contains primarily the appar- 
atus for both laboratory and lecture room, used in 
teaching the subject of Physics in educational insti- 
tutions. In addition it contains a great many instru- 
ments which arc used bv research workers in all fields 

■ 

of science, such aa Mechanical Measuring Instruments, 
Electrical Apparatus and Optical Instruments, This 
catalog will be sent postpaid to any teacher or lab- 
oratory director immediately upon receipt of a request 

giving the name of the individual, the institution and 
his official connection with it. 



M 

ml 
l»A.Diil] 

I8L ALV 



m 



i 

to 

n 

tii 

cm 

n 

BAS 
121 BLC 

U 
(r 
ft 

I 

b 

X 
I 

it 

u 



68 




.**■* 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 




BLOOD TESTING 



No. 1220. 





_ , - 

2 
No. 1222. No. 1224. 

BLOOD TESTING APPARATUS 

1220. ALKA1I RESERVE DETERMINATION OUTFIT for blood plasma, consisting of nine sealed 

tubes of resistance glass containing standardized phosphate solutions colored with phenolsub 
phonephthalcin, numbered from 7.0 to 8.6 by 0.2; one non-soluble dialyzing tube; one tube for 
making dialyzing sacs; one tube for aeration; one capillary nozzle tube; and 100 cc of phenol- 
sulphonephthalein in 0.8 per cent, sodium chloride iudicator solution. Complete in wooden 
pocket case with directions for use. (See Archives of Internal Medicine for June, 1916.) $6.50 

1220A. Dialyzing Tubes only of No. 1220 per dozen .60 

1220B. Glass Tubes only of No. 1220, for making the dialyzing sacs per dozen .72 

1221. ALVEOLAR AIR TESTING OUTFIT, similar in appearance to No. 1220, but with eight sealed 

resistance glass tubes filled with standardized phosphate solution colored with penolsulphone- 
phthalein and numbered from 10 to 45 mm by : mm. The complete set consists of one long 
non-soluble glass test tube; one non-soluble glass capillary nozzle; one metallic comparison box 
to hold the specimen and two color tubes; one 1000 cc rubber bag; one rubber bulb; one pinch- 
cock; one glass mouthpiece; and 100 cc of standardized sodium bicarbonate indicator solu- 
tion, in wooden pocket case with directions for use. (See Journal of American Medical Asso- 
ciation, Vol. LXVI, pages 1594-1596, for May 20, 1916.) 8.50 

1222. Capsules, Wright's, of glass. For collecting small amounts of blood, which may then be sealed 

until required for use. Length about 3 inches. Capacity about 2 cc per box of 12 1.00 

BASAL METABOLISM APPARATUS, see page 534. 

1224. BLOOD GAS APPARATUS, Van Slyke, for the determination of the degree of acidosis from 
the bicarbonate content of the blood through the liberation and measurement of carbon dioxide 
from the blood plasma. The apparatus was designed by Dr. Donald D. Van Slyke of the Roeke 
feller Institute for Medical Research to provid? a rapid, accurate method of making this im 
portant determination in the clinical laboratory. With this apparatus, a determination re- 
quires only a few minutes for completion and may be made with 1 cc or less of blood plasma. 
The gas volumes are measured in the stem of the special burette, which is graduated to 1 cc 
by 0.02 cc divisions. Mercury is used as a leveling fluid, about three pounds being required 
for the satisfactory operation of the apparatus. A 4-ounee glass bottle No. 1578 filled with 
No. 7128 glass beads, a 250 cc separatory funnel No. 6162 and two pipettes No. 1224C are re- 
quired in the technique for this determination. These items including mercury are not includ- 
ed in the outfit. Complete with iron stand, clamps, special burette, leveling bulb, rubber tub- 
ing, thistle tube and set of directions . . . . . 18.50 

1224B. Glass Burette, only, of No. 1224, with stem graduated to 1 cc by 0.02 divisions making 50 divi 
sions in all. Additional graduations indicate volumes of 1.5, 2.0, 2.5 and 50.0 cc 12.00 

1224C. Glass Pipette, Ostwald-Van Slyke, with long tapered delivery tube for use in pipetting from 
upper cup of No. 1224B. Accurately graduated to deliver 1 cc 

69 




BLOOD TESTING 



CBNTBAL s.'IKNTIIK' CO., .HI OAOO, U. 8. A- 









No. 1225. 










No. 1224F. 

1224F. BLOOD GAS APPARATUS. Van Slyke-Stadie, Precision Model, for the determination of gaseous 
nitrogen, oxygen, carbon dioxide, carbon monoxide and uirthrnio^iuhin m blood. Tin apparatus 
is a modification of the No. 1224 Van Slyke apparatus for the determination of carbon dioxide 

in whole blood and bl I plasma, with which the authors have developed a t^hniqiu' whereby 

all the blood gases may be determined in <"»•• -ample of 1 cc of blond. With this refined appara- 
tus, gas volumes may be read directly to 0.010 c< with an error of leas than .00.1 cc, hut in order 
to preserve this accuracy, tin- ^' s chamber is water jacketed. For further accuracy in meas- 
uring small gas volumes, a leveling bulb of special construction, which may In* used with an 
index maintained at exactly 500 nun above the surface of the mercury, enables the op- 
erator to take readings on gas volumes magnified under a reduced pressure of 500 mm of mer- 
cury. The extraction of gas from the blood mixture is facilitated by whirling the mixture 
about the wall of the chamber by a motor driven Bhaking device. (See Journal of Biological 
Chemistry, Vol. XLIX, No. 1, for November, 1921, page 1.) The same accessories as listed 
under No. 1224 are used with this apparatus but are not included in the outfit. Complete with 
iron stand, clamps, special buntte with water jacket, mounted on a hardwood back with shak- 
ing device, special leveling bulb and rubber tubing, but without electric motor §24.00 

1224(1. Glass Burette and Water Jacket, only of No. 1224P, with stem graduated to 1 cc by 0.01 cc 
divisions making 100 divisions in all. Additional graduations indicate volumes of 1.5, 2.0, 2.5, 
and 50 CC 16.00 

1225. COAGULATORS FOR BLOOD SERUM, Inspissators, double walled, gas heat, for the pieparation 
of blond serum slants employed in diphtheria work. Constructed of copper and heavily tinned 

on the inside. The outside is rovered with insulating material and tin* top with heavy felt. 
The two front legs are adjustable in height for tilting to any desired angle to produce the 
proper slanting surface on the coagulated serum in the test tubes. Complete with water level 
drip cock, and tubulatures for thermometer and thermoregulator. 

No .-•:•••: A C 

Length inside, inches 12 16 

Willi h inside, inches 10 ^ 

Depth inside, inches L > '4 2% 

Each 35.00 45.00 

1223F.COAGI7LATOR FOR BLOOD SEBUM, Inspissator. Electric Heat. Constructed with double wallfl 
of copper, heavily tinned inside, with bottom and Bides covered with asbestos slate to prevent 
the radiation of heat. The top covet is made of polished copper hinged in the center and cov- 
ered on the underside with thick felt. A pi-neil type thermostat connected in parallel with the 
heating units controls the temperature of the working chamber. A pilot lamp indicates when 
the current is on or off. Inside dimensions, 22 inches long, 12% inches wide bv 3% inches 
deep For 110 volts A. C. or D. C. Complete on 4 inch iron stand with two adjustable racks 
for 18 tubes •' 12Q Q0 

70 





1 .% 1 « 


D0LI 




I 

■ 




Rj 




in 


- 


l.Needl 


• 


COLL 




u<3 








COLO 




CULT 




du? 








rob 




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It?. 


BLOO 






1-V- 


tiai 




BLOO 


-..< 


BLOO 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BLOOD TESTING 






No. 1226. 



No. 1228. 



No. 1232. 



No. 1233. 




NO. 1231. 



<£ 





No. 1236. 




JiA 








No. 1237. 



No. 1238. 



No. 1239. 



1226. 



1228. 



1232. 



1233. 



1234. 



COAGULOMETER, Biffi-Brooks, for the coagulation test of blood. Requires but a few moments 
for the determination, is accurate and readily portable. With thermometer and directions for 
"J 8 $13.00 

COAGULOMETER, Brodie-Russell-Boggs, for use on the microscope stage for determining the 
exact tune for coagulation of blood from the movement of the blood corpuscles when subjected 
to blasts of air from the rubber bulb. Complete with rubber bulb, in velvet liucd leather 
case 15.00 

COLLECTING NEEDLES, Wassermann, for obtaining blood for investigation. With knurled 
finger grip to facilitate insertion each .12 

per dozen 1.20 
COLLECTING NEEDLE, Wassermann, Detroit Clinical Type, for use with standard 15 cc centri- 
fuge tubes. By means of this device the blood may be collected direct lv in the centrifuge tube 
thus obviating the possibility of contamination thru transferring of the sample from one ves- 
sel to another. Of brass, nickel-plated, with constriction and slotted edge causing it to fit 
firmly over lip of centrifuge tube. Complete with two steel needles of proper size 1 00 

1233 A. Needles only, for No. 1233 eacn ] 10 

_ _, per dozen 1.00 
COLLECTING TUBES, Keidel's Vacuum, consisting of a 5 ec bulb, drawn out to a capillary tip 
and sealed after a vacuum has been created by heating, a 25 gage hose-hub needle, a piece of 
rubber tubing for connecting needle and bulb and a glass tube for protection during steriliza- 
tion. Complete as illustrated each .20 

per dozen 1 80 
COLORIMETERS for Blood Testing, see general heading Colorimeters. 

CULTURE TUBE. Keidel Vacuum, for Blood, modified by Judd and Simon for culture work. 
Consists of a tube with a capacity of 50 CC drawn out to a capillary tip, into which is intro- 
duced 15 to 25 (-. of glucose bouillon containing 1.5 cc of sodium citrate. The tube is then 
exhausted and sealed. Complete with a 24 gage hose-hub needle with stylet, heavy wall, d 
rubber connecting tubing, and a glass tube for protection during sterilization, filled and sealed 
ready for use each .60 

t»t mm. P er dozen 6.00 
BLOOD SUGAR TUBE, Folin, improved form, with 4 ec bulb, parallel constriction and slight 
lip. Graduated at 25 cc. This tube is also used for the determinaton of creating plus crea- 
tinine. (See Folin and Wu: Journal of Biological Chemistry, 1920, xli, 367.) 55 

BLOOD SUGAR TUBE, Folin, same as No. 1237, but graduated at 12.5 and 25 cc .60 

BLOOD SUGAR TUBE, Folin, same as No. 1237, tut without graduation mark, to be calibrated 
in the laboratory , ,,.,,,,,., 40 

71 



1236. 



1237. 



1233. 

1239. 






BLOOD TESTING 



CEN 



nthai. * ii vnn. - o. chicaoo, v. a a 






cc 

Zip 



i^ 






iC 



ZJ 



t 



No. 
1240. 



' 



«> 




No. 
1241. 



No. 
1242. 



No. 
1243. 



No. 
1244 



No. 
1244A. 



NO. 

100112 



No. 
1245. 



No. 
13370D. 



1240. 



1241. 



1242. 



1243. 









tuood SUGAR TUBE Gradwohl-Blaivas. a heavj wall test tub. 150 mm by 18 mm without li Pf 
™Ju l h^.OU Sand 20 ae. [See Gradwohl and Blah pre. Method, ... hi..uU and 

Urine Chemistry, 1920, page 38 • •••• '0.60 

BLOOD SUGAR TUBE Lewis-Benedict, a heavy wall best tube L60 mm by 25 mm with a slight 

Up, graduated at 12.5 and 25 cc, B* tiewii and Benedicts Journal of Biological Chemistry, 

1915, xx, 61.) M 

BLOOD SUGAR TUBE Myers-Bailey, a heavy wall teat tube BOO mm by 13 mm inside diameter, 
without lip. graduated al 3, 4, 10, 15 and 2" ■■■ See Mjrers and Bailey: Journal of Biological 
Chemistry, 1916, xxiv, 147. and Victor C. Bieyere: Practical Chemical Analysis of Blood, 

1921, page 67.). 5° 

DIGESTION TUBE, Folin, a heavy Pyres Glass test tube 200 nun by 25 nun graduated at 35 and 
:»(i .c, fur use in the nficro-Kjeldahl digestion of blood filtrates in the determination of non- 
protein nitrogen in the Mend. It is also used in the determination of area in blood by means 
of una-- and autoclave decomposition. The graduation facilitates n.-ssbrization in the diges- 
tion tub. (See Folin and Wu: Journal of Biological Chemistry, 1919, xxxviii, 87.).. .70 

13370D. DIGESTION TUBE, Folin, same as No. 1243, but without graduation for calibratiun in the lab- 
oratory per dozen 4.08 

For special apparatus for FOLIN MICRO- KJELDAHL METHODS, see general heading Urine 
Analysis. 

1244. PIPETTE, Folin-Wu, for use in the preparation i t protein free blood filtrates. Graduated from 
tip to 15 <c by 1 <•<• divisions. Bee Folin an 1 Wu: Journal of Biological Chemistry, 1919, 
xxxviii, 81.) 50 

124 4 A. BURETTE, Folin Micro-Sugar, foi pinch-cock connection with special tip f<»r the delivery of 45 
to 55 drops per cc. Graduated to •"• cc by -02 ec divisions. Length, 14 inches. Complete with 
rubber connection and tip 2.25 

PIPETTES. Ostwald-Folin, as used in Folin 's method for the determination of total nitrogen, 
urea and ammonia in urine, and in the methods of various biochemists for other determina- 
tions upon body fluid- The capacity indicated is the volume delivered when the pipette is en- 
tirely emptied. See Folin and Wu: Journal of Biological Chemistry, 1919. xxxviii, 81.) 

5 
.70 

Used 

(See 

.30 



10502 



Capacitv to deliver, cc 
Each 



1245. 



1 2 3 

55 .58 .67 

RECEIVING TUBE, Folin, a heavy wall test tube without lip with graduation at 25 cc. 
in the determination of urea by urease decomposition and the M icro-K j.ldahl method. 
Folin and Wu: Journal of Biological Chemistry, 1919, xxxviii. 87.) 












We Carry a Complete Stock of 

• 

Cenco Certified Chemicals Colemann and Bell Stains 

Difco Desiccated Culture Media 
Pfanstiehl Rare Sugars and Pfanstiehl Amino Acids 

Send for Our Chemical and Reagent Catalog 






72 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



BLOOD TESTING 




I 



Fuchs-Rosenthal 
ruling. 





Neubauer ruling. 



No. 1250. 



- -, r- 







UBAUE 



1T0 5( l- m 
mm.de 



No. 1249. 




No. 1251. 



a ■■*< 






HAEMACYTOMETERS 

El^ d ^JS?f!/^. 8 ^^! n tA a8 bee . n ,lcv °ted to the development of blood counting appara- 

iiin of maximum utility. 



tus, which would be of the required degree of accuracy and at the 





1246. 



1247. 
124$. 




1249. 
1250. 



* 



* 



1251. 
1252. 
1253. 

1258. 



1259. 
1266. 

1267. 

1270. 
1272. 
1273. 



pe. 

rMTTxrr^ addadattto _____._. -n.-_x._T. 

haemacy- 

of chamber 

th counting 

Countin g Chamb er only of No. 1246, with two cover' gi^Mr^itw'iks;::;:;: ^eoo 

HEMACYTOMETER, ™th Single Neubauer Ruling. Th, chamber is ruled to _>400 mm with 
the Neubauer arrangement of lines and is 1/10 mm deep. Complete with one sinele Neu- 
bauer chamber, two cover glasses, one diluting pipette for red and one for white corpuscles 

In It ulD(?r CflSG -■■• ........ i c f\t\ 

2?5S¥_J2S5SS_^ 7 ' of Xo - 1248 ' wtth two °°" v « gjii'esV wYthou/ca.^.* .'.'.■;.'.' 7 00 

HAEMACYTOMETER Levy, with Double Neubauer Ruling. The chamber furnished ^th this 
hemacytometer is of the same construction as that of Xo. 1248, except that it is provided 
with two ISeubauer rulings separated by a short moat. The double chamber enables both red 
and white corpuscles to be counted at the same time without cleaning and refilling the cham- 
ber. The unusual rapidity with which it is possible to make blood counts with this haemacv- 
tometer has made it the universal favorite of the medical profession. Complete with one 
double Neubauer chamber, two cover glasses, one diluting pipette for red and one for white 

corpuscles, in leather case 18 00 

Counting Chamber, only, of No. 1250, with two cover glasses: without'case io'oo 

Cover Glasses, only, for No. 1250, size 20 bv 26 bv 0.5 mm . "each \ct 

HAEMACYTOMETER. Levy, Burker-Neubauer, same as No. 12.10," but'w'itli Bu^au'of Standard" 
certificate for c oun ting chamber and pipettes 26 00 

" ~ "" the 

over 
.3.75 

MIXING PIPETTE, Thoma, for ,ed 'corpuscles, for difutionTn the' "ratio "of 1 to ICNDLltiCh rubbed 
tubing and mouthpiece 2 Qft 

MIXING PIPETTE, Thoma, for white corpuscles, for dilution 'in the "ratio of I to 10, with rubber 

t ubi ng and mouthpiece o no 

COVER GLASS for Counting Chamber, 21 mm square, polished! 0.4mm' thick 50 

CASE for Counting Chamber, of leather, velvet lined l' 50 

CASE for Complete Hemacytometer, of leather, velvet lined. ..... . .............".."..'. ' 8.00 

73 







BLOOD TESTING 



, | viK ai. sni.M'inr .•()..< HI' A(.o. r. s. A. 










^H 






1274. 



1275A 
1275B. 

1276. 



No. 1278. No. 1280. 

HAEMOGLOBINOMETER, Dare, for givingan expression of the extent of anemia in terms of 
pi tages of haemoglobin in normal blix.il, 1<mi pi nt. corresponding to the color of a 
solution of L3.77 grama of haemoglobin in LOO cc of serum. The various shadi - ol color cor- 
responding to t 1 ale are obtained by rotation of a prismatic glass semicircle tinted with 
the golden purple of Cassius, which La secured to a thin white glass disk. The numerical 
scale is placed on the edge of a corresponding semicircle of thick opal glass and ie nad 
through a window in the Bide of the instrument. A feature of this instrument is the automatic 
pipette for collecting the blood sample, which consists of an oblong plat*' of opal glass and 
one of clear glass, ^_ tnd so as to leave a small space between the two when «- lamped to- 
gether. A small drop of blood touched to thi i of the pipette will !•■ instantl; drawn in 
ami distributed evenly by capillary attraction. The case protecting the working parts uf the 
instrument and the viewing teli scope are of aluminum lacquered black. The Instrument is sup- 
plied in two models, one for candle illumination and the other for electric illumination using 
a small buttery conceals! in the handle as a source of current A velvet lined leather carry- 
ing case i^ supplied with each instrument. 

No A B 

Illumination ttdle Battery 

_ Each ■ • • $30.00 39.00 

Lamp, Incandescent, for replacement in No.l274B instrument each .50 

Battery, for replacement in No. 1274B. About 250 bl I examinations can be made with each 

batten- 



each 



35 



1278. 



1280. 



Pipettes, Automatic Collecting, roi.sistin- of one oblong opal glass plate and one clear glass 
plate of the proper dimensions for correctly collecting and holding the bl I samples in No. 

L274 liarinn^liilnimiiU'ters. 

No. 

Illumination 

■k^CH. g«j(" 

HAEMOGLOBINOMETER. Tallquist, , rising of a cVlor'scalV of 10 tinta, ranging from 10 



A B 

< mdle Battery 



Sffi^n* f«r iSnT T' VW '" ' m " k form ' ***** si/ "' " it1, '" ^"'^ °* absorbent paper 
sufficient tor 150 tests. With directions for use 175 

H t^SS^ f^' «° r ^ ten t^f th€ ^^ogiibin 'cokieniot 'bliodbV con^tin 
?X? tube liZ v h ^ To ^ 0Tlde *** comparing with a liquid color standard sea 
kftLS* !SF?°??"« '" a ' P" cent "™» ot normal blcJod. The graduated tul 



g the 
ealed in 

tube has 







74 






BM 


-•- 


Gra 


:.• 


Gw 




HY1 




tn 












hi 


'..' 


LAI 




LA! 


:.■ 


LA] 




>2 




UK 


" IDC 








ol 








I 




h 




a 




w 




Pi? 








PIP 


•i 


PIP 








HE 




SAJ 



M I 



B 



1281 
1282. 
1283, 
1286, 



1290. 

1292. 
1296 



1308 



1320 



1322 



1340, 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BLOOD TESTING 




4H 



* 



No. 1290. 




No. 1292. 



No. 1286. 



=aOTr s * gg -H=3fra 




No. 1322. 



No. 1296. 



C S.C 





No. 1320. 



No. 1308. No.l340. 

Haemoglobin Standard, in sealed glass tube, for use in No. 1280 $2 00 

Graduated Tube, HO divisions, for No. 1280 .7.7.7. 1.35 

Graduated Pipette, 20 emm, for No. 1280 1*35 

HYDROGEN-ION" CONCENTRATION APPARATUS for determining the hydrigen-ioa "content 
of the blood colorimetrically, as suggested by Drs. Levy, Rountree and Marriott. The outfit 
consists of a series of standard colored liquids sealed in glass tubes, a wooden holder for the 
tubes and a comparison box for matching the color of the unknown with the standard colors. 
Complete in wooden ease 1 :1 s x4xll!j inches. (See Archives of Internal Medicine, Vol. XVI, 

for September 1915, page 389.) 8 50 

For other HYDROGEN ION CONCENTRATION APPARATUS, see No. 10312. 

LANCET, Blood, with nickel-plated metal handle into which the lancet can be screwed for pro- 
tection 80 

LANCET, Blood, same as No. 1290, but with hard rubber handle 7.... 7 .7. 7. 7 .55 

LANCET, Blood, Spring, in nickel-plated handle with spring clamp, and screw to adjust 

depth 2.50 

METABOLISM APPARATUS, see page 533. 

MICROSCOPES for Blood Testing, see general heading Microscopes. 

MICRO-SACCHARIMETER, Epstein's, for the estimation of sugar in the blood, making use of 
the color change brought about by heating a mixture of sugar and picric acid in the presence 
of sodium carbonate, the depth of the color depending on the amount of sugar present. With 
this apparatus an accurate determination may be made with as small an amount as 0.1 cc of 
blood. Complete with two standard color tubes, an accurately graduated tube for the unknown 
holder with opaque glass slide for the color tubes, pipette graduated to 1 cc in 0.1 cc divisions 
capillary pipette graduated at 0.1 and 0.2 cc, tube graduated at 1 and 2.5 cc, two boiling tubes 
with holder, filtering funnel, dropper, an-1 set of three dilutions — picric acid, sodium carbonate 
and sodium fluoride, in case with directions for use 14.00 

PIPETTE, Comer Automatic, for vaccines, etc., designed to deliver exactly 1 cc, with reservoir 
to hold excess 1,30 

PIPETTES, Wassermann, see No. 10506. 

PIPETTE, Wright's Blood, of soft glass with end shaped to take rubber tube, and with point 
Carefully drawn to capillary tip. Length over all, 7% inches ,20 

REFRACTOMETERS for Albumin in Blood, see general heading Refractometers. 

SALVARSAN TUBE, Graduated, with rubber tubing connections at the bottom. Diameter, 1% 
inches; length, 12 inches ; capat tty, 250 ce wmm 1,59 

SPECTROSCOPES for Blood, see general heading Spectroscopes. 

75 






>!», 









BLOOD TESTING 



CENTRAL 



8CIKNTIF1 HICAGO. S^ 










134 



1348. 



1354. 






1355. 
1356. 
1357. 
1358. 

14336B 









No. 1348. No. 14336B. 

SPHYGMOMANOMETER. Roger's Tycos Aneroid, complete with indicator, patent arm sleeve 
und milating bulb with control valve, in mora trryrag case, 5%x3%x2% in -, with direc- 
tions I $25.00 

SPHYGMOMANOMETER, Office Type, designed to be used on i .or the wire frame may 

I,, and tin tly to the wall. This instrument permits more accu- 

rate observations to be made than with the po ki I type and in less time, as the instrument is 
always ready. It has a 6-inch silvered dial, long black hand and heavy case. Complete with 

6 fe»-t of rubber tubing, pneumatic bag, alee Sating bulb and valve 37.50 

SYRINGES for Blood Testing, general heading Syringes. 

UREA APPARATUS. Marshall's for Blood, coi ng of three 200 cc Erlenmeyer flask* with 

two-hole rubber stoppers, two _ - cylinder* 2x2 inches with two-hole rubber stoppers, one 
Drei hse] gas washing bottle, two ium chloride tnbea with one-hob- rubber stoppers, one So. 

5476A Filter Pump, three special Folin absorption tubes, with ne* ry com. ng tubes of 
glass and rubber, as illustrated, without supports. (See Journal of Biological 

Chemistry, VoL XV, No. September 1915.) 9.75 

Folin Tubes only of No. 1354, with perforated bulbs each .45 

Bulb Connecting Tubes only of No. 1354 each .35 

Glass Connecting Tubes only of No. 1354, 1. shape, lonf in cylin each .12 

Glass Connecting Tubes, L shape, short, for connecting Basks of No. 1354 each .12 

For additional UREA APPARATUS, m Urme Analysis Apparatus. 

WASSERMANN BATH, DeKhotinsky Electrically Heated and Regulated. Designed especially 
an easily operated, dei cndable bath for use in routine sero diagnostic work. The 
bath is made of heavy copper, tinned on the inside and covered on the outside with heavv 
asbestos slate, enameled in white. The two heating units are of the same tyi sed in our 

DeKhotinsky incubators, i. e., chromel wire spirals wound on mica strips. They are placed ia 
a metal tube at the bottom of the bath where they are entirelv surrounded by water. Pro- 
visions are made so that the units can be easily replaced in ease of accidental injurv. The 
bath may be used^at a temperaLure of 56° C. as an inactivating hath, or at 37.5° I r incu- 
~" - • ..... ^^^ 

pera- 

. quired. The thermoregulator is placed in a 

?. r ti.i «!•' I ,s ' mmerse<1 ,n *"« ^ath near the heating units. A pilot lamp Lb furnished 

, "' ' : ' t t,n * wh . en ^e enrrent is on or off and to assist in setting the bath to operate at any 

kn oi tl '"Tl T^ 1^ «H«*ijg temperature is easily changed by turning the knurled 

tubes un to i ,", h • S- thermort " ffU l ator Two travs ar * ^rnished with place. i„ each for 48 

C or D C <wS t "".I '^ . S,Ze ° Ver a " U bv "% bv "' ' "«***■ For 110 volts A - 

Plug! but withouTw tnbt " "'^ thm ™»** t connect,,,, cord and attachment 

WASSERMANN PIPETTES, seeWpettes" No ' 105M 

WASSERMANN TUBES, ..... Test Tubes So! uSt 

7G 



CENTRAL SCIENTIFIC CO., CHICAGO, TJ. 8. A. 



BLOWERS 




No. 1374. 






No. 1382. 



No. 1388 



, . 




1374. 



NO. 1376. 



No. 1380. 



BLOWERS 



BLOWERS, Foot, Fletcher's, portable; give a steady and powerful blast 

No 9 

Diameter of air reservoir, inches 7^4 

Pressure obtainable, per square inch, lbs 1 

Capacity, per hour, cubic feet 190 

Each $9.00 



9A 


9B 


9 


11 


1% 


1% 


330 


62.1 


11.00 


17.00 



1376. BLOWERS, Foot, Fletcher's, mounted on legs with rubber reservoir underneath, thus obviating 
the risk of injury. Specifications are same as given under No. 1374. 

No. 10 10A 10B 

Each 10.00 12.75 18.50 



1377. RUBBER DISKS for Nos. 1374 and 1376 Blowers. 

Adapt ed to Nos 

Number of disks required 

Diameter, inches 

Each 



9& 10 

1 

.50 



9A & 10A 
2 

11% 

.75 



9B & 10B 
3 
14% 
1.00 



1378. NETS for Nos. 1374 and 1376 Blowers. 
No 

For blower Nos 

Each 



A 

9& 10 
.40 



B 

9 A & 10A 

.50 



C 

9B& 10B 
.60 



1380. BLOWER, Hand Bellows, 7 inches in diameter 1.40 

1382. BLOWER, Hand, of rubber, two bulbs, one covered with net for constant pressure 1.70 



BLOWERS FOR POWER USE 

1388. BLOWERS, Hot Air, electrically operated, for producing a constant stream of hot air; useful 
for quickly drying glassware such as large flasks, etc., also for promoting evaporations. 
Complete with double switch, one for blast at room temperatures, the other for hot air, and 
with cord and plug for attaching to lamp socket. For 110 volts A. C. or D. C 18.75 

77 







BLOWERS 



CENTRAL 



sriKNTliK' 00., CHICAGO, U. a A 







i:;;hi. 



1394. 







No. 1390. 



No, 1394. 



BLOWER Automatic Electric Air Compressor and Exhaust Pump Combined. Provided with 
switch for automatic Btarting and stopping of the motor at variations ol i are. Tfciaiwitcfc 
operates onlv when the pump is used for pressure and the tank ii connected only with the 
pressure outlet of the pump. Suction Is obtained bj attaching a tube to a hose nipple at the 
base of the cylinder. Complete with four gallon tank, pressure gage and motor compactly 

mounted mi one base, •M.jxll'J in. 



Bore, in *'* 

Strike, in 2% 

Free air per minute al 200 r. p. m., 

eu. ft 1*2 



No. 

For volts 

Size of motor, h. p 

Each 



Poi i ressure up to, lbs 40 

Vacuum up to, In 26 

Eeighl over all, in 25% 

Weight, lbs 

A B C 

110 A.<\ 110D.C. 220D.C. 

$97.00 97.00 97.00 



1396, 



BLOWER, Twin Cylinder Air Pump, for power use. \ very desirable pump for pro. luring a sup- 
ply of compressed air Cor use in the laboratory. Can be used in conjunction with No. 1396 
Tank listed below. The bearings are extraordinarily large and wide and if not allowed to run 
dry and cut will last for many years in daily use without appreciable wear. Cylinder is bored 
ami reamed. Pistons have two cast iron split rings fitted with greatest care. Cylinder head 
and valve chest are in one piece, allowing larger valves than by any other construction. Tin* 
intake valve stems project through a hole in the valve plat* . allowing inspection or removal 
without disconnecting the discharge pipe. Exhaust valves ;nv hall type, supported hy >titr 
springs, insuring highest obtainable efficiency. Cooling flanges of correct size and design an- 
used and all the metal in the pump is distributed to aid in radiating heat, as well as in making 
the compressor rigid, free from vibration, and unusually neat in appearance. Equipped with 
tight and loose pulley 12 inches in diameter ley 1 Inch face. All parts made to standard size 

and interchangeable. 

Boro, inches l r S 

Stroke, inches 2 

Power required to operate, b.p V^ 

Free air per minute at 400 r. p, m., cu it - 

For pressure up to, lbs 1 " :> 

Each ' [[ 29.50 

TANK, of heavy galvanized iron, similar to that shown in illustration of No. L390, 7% gallons 
capacity, with 50 lb. pressure gauge, petcock on upper end and two % inch iron pipe size bush- 
ings in the side for making connexions. Dimensions over all, diameter, 8% inches; height, 30 
inches ...... 13.50 



7s 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BLOWERS 



CENCO ROTARY BLOWER AND VACUUM PUMPS 

1398. BLOWER AND VACUUM PUMPS, Canco Rotary, Electrically Driven, for producing a blast 

for the Operation Of Ma«t lam I; s and for use with other laboratory devices ^uFrin mod "ate 
air pressure or vacuum. The blowers are of . small size, very compact, and withfew jfarts They 
are free from mechanical troubles and require practically no attention except an occasional 

oiling. They are mounted on a cast iron base, direct connected to a constant si 1 motor of 

generous size and arc provided w.th a valve „„ th, outlet tube, bv means of whid the air 
pressure can be varied. The outer casing of the blower is water jacketed so that the heat de- 
veloped by compression during continuous use may be removed. 

SPECIFICATIONS. 

gy« ^m -/ wjBMfflh 8ize of ,,ase » 5x9 V& inches. 

' llUffi/ MmSllBSift - i r*peed, 172.1 r. p. m. 

^^ Pressure at maximum speed, 7 lbs. per 
'TfLm. R square inch. 

^L\D^(fc K% 7*- Cubic feet of air per minute, 0.7.~>. 
" r -~ ^\^A ^-V^~Vp«m3 Number of blast lamps operated simul- 

\S. taneously, 2. 

Vacuum at maximum speed, 16 inches 
of mercury. 

I ^^) ^^^i^i» ''"vver consumption, 66 watts. 

^^5K—- ^gndJi^^Ll : ^M ^r Jacket water cooled to prevent heating 

- />j*-^^ ^^^^^^^^s ^^ ^^^BPB ^^ " n continuous use. 

"z&Zr "^^^^^^^^^mms- ^^r Complete with 1/20 h. p. direct connect- 

ed motor and pressure regulator, 
No. 1398. mounted on japanned iron base. 

No A B C I) 

For volts A. C. D. C. 

110 220 no 220 

Each $48.00 50.00 48.00 50.00 

1399. BLOWER AND VACUUM PUMP only of No. 1398, with grooved pulley, but without base, motor 

or other accessories 15.00 

1400. BLOWER AND VACUUM PUMPS, Cenco Rotary, Electrically Driven, similar to No. 1.598, but 

of larger size and capacity. 




SPECIFICATIONS. 

Size of base, 1:5x7% inches. 

Speed, 1725 r. p. m. 

Pressure, 10 lbs. per sq. in. 

Cubic feet of air per min- 
ute, 1.4. 

Number of blast lamps op- 
erated simultaneously, 4. 

Vacuum, 18 in. of mercury. 

Power consumption, 175 
watts. 

Jacket water cooled to pre- 
vent heating on continu- 
ous use. 

Complete with % h. p. di- 
rect connected motor and 
pressure regulator, mount- 
ed on japanned iron base. 



No 

For volts 



Each 




No. 1400. 



A 

110 

63.00 



A. C 



I). C. 



220 
66.00 



110 
57.00 



D 

220 
60.00 



1401. BLOWER AND VACUUM PUMP only of No. 1400, with grooved pulley, but without base or 
motor 18.50 



79 



jii_— «4^— ». 






BLOWERS 



CENTRAL SCIENTIFIC 00, CHICAGO. P. a ± 



%■ 




No. 1402. 















No. 1406 (3-A & 4-A) 



No. 1408, 



1402 



BLOWER and VACUUM PUMP. Crowell Rotary (No. 0-D). This pump is used principally for 

vacuum work, giving from 29 to 30 in. of mercury, according i<> atmospheric conditio! It is 

fitted in an oil immersion box, which makes it practically leak-proof. Capacity about 2 eu. ft. 

of free :«ir per minute. Inlet and outlet tapped for *& in. pipe size. Requires about % h. p. 

to operate • $66.00 



JftHK- 




'■~ 



I 11 Mi 






I 






1408 



BLOWER and VACUUM PUMPS, Crowell Type A. Adapted for all purposes requiring- air under 
pressure of from l to in lbs. to the square inch and any degree of vacuum not exceeding 24 in. 
The pressure is sot dependent upon high speed or centrifugal force. There are i n springs, 
gears, valves or unbalanced parts. Satisfactory for furnishing vacuum or pressure throughout 
the Laboratory. Air receivers are usually not required, hut are of advantage where a close 
regulation of the pressure is desirable. (See No. 1410.) 

No 1-A 3-A 

Cu. in. free air per revolution l'ii 125 

Cu. ft. free air per min. at maximum speed q$ 25.3 

R. p. in. at maximum speed lit mi 350 

Approx. h. p. at 3 lbs. pressure ' y ' ■_. 

Pulleys, in 4x1 6x2U 

Net weight, lbs 24 90 

Pipe size, inlet and outlet, in i ., 1 

Floor space, in. H«xifi, 22x14 

Each, without air receiver 28.00 58.00 

BLOWER and VACUUM PUMPS. CroweU Type D. Tor pressor, is up to 25 lbs. per square inch 
and vacua from 29 to 30 in. of mercury. The system of lubrication is positive and auto- 
matically controlled by the air pressure. The heads are provide 1 with water jackets for cool- 
ing. Construction throughout is heavier than Tvpe A, adapting this type for heavier duty. 
(For Air Receivers see No. 1410.) 

K°-.-", : /•: l-D 2D 3-D 

Lu. in. tree air per revolution 15 ±q 200 

Cu. ft. free air per minute at maximum Bpeed 4.3 o •> 17 

R. p. m. at maximum speed _ - n( > aqq 3QQ 

Approx. h. p. at 15 lb. pressure or 29 in. vacuum >.. 1 2 

Pnllevs. in i 6x2 8x2 12x4 

Approx. net weight lbs JQ nf) 25Q 

Pipe si/.e, inlet and outlet, in 1 ■, j 

£2? &p ^ e ' i n -- • ..;::;:::.;:: una 14x22 19x34 

Each, without air receiver 7g 0Q 95 QQ 125i 0Q 

80 



'■•■ BLOW 

Ei 

iv-. BLOW 

Ml BLOW 

U& BLOW 

en.] 

• BLOW 

BLOW 

•« BLOW 

Ml BLOW 

b 

"** BLOW 

bio* 

Uted 
epek 

* Biow 
Mt BLOW- 

^ BLOW 
«ntt 






CENTRAL SCIENTIFIC 00., CHK'ACJO, U. S. A. 



BLOWPIPES 



s 



■ditions. I 

■- 
about \ 



Kl 



iring iir ads 
um 

re so spra© 

ur# throa^Nl 

where j (In 



15 

a 

.'. 
i 

le- 



per n m ** 

itJVf w* «» 
I heavier W 



IH 

* 

SI 

1 




1410 



1414, 



No. 1414. 



No. 1410. 



1430. 

1432. 
1433. 

1436. 

1438. 
1439. 
1442. 

1444. 

1448. 



1450. 
1454. 
1455. 



AIR RECEIVERS l'or Nos. 1406 and 1408, which can be set to blow 
off at any desired pressure by turning the adjusting nut. 

No * 1 2 3 

For Blower No 1-A or D 2-A or D 3-A or D 

Height, inches 12 12 20 

Length, over all, inches. 18 18 26 

Diameter, inches 8 8 10 

Capacity, gallons 2.6 2.6 6.8 

Net weight, lbs. 15 15 28 

Pipe size, inlet and outlet, inches. '•_■ % 1 

Each 512.00 12.00 14.50 

BLOWER, Muencke's, operated by water blast for either compressing 
or exhausting. With 30 pounds pressure it will run two ordinary 
sized blast lamps. Intended for connecting to water supply by rub- 
ber tubing. Complete with one Filter Pump No. 5476, zinc water 
chamber 4x8 inches, air outlet and stop-cock for regulation. 18.00 




No. 1430. 





No. 1450. No. 1448. No. 1436. No. 1454. 

BLOWPIPES 

BLOWPIPES, of brass, plain. Length, inches 8 1" 

Each . . . '. 30.18 .20 

BLOWPIPES, of brass, with air chamber. Length, 10 inches each .55 

BLOWPIPE MOUTHPIECE, of wood to fit blowpipes Nos. 1430 and 1432 each .18 

10% discount in lots of 12 from Nos. 1430-2-3. 

BLOWPIPE, Berzelius Form, of brass, with hard rubber mouthpiece and platinum plate placed on 
end of jet. Can be taken apart • • « 3.25 

BLOWPIPE, Black's, japanned tin, removable brass tip. Length, 8% inches -Is 

BLOWPIPE TIPS for No, 1438 P er dozen \ 10 

BLOWPIPE, Black's, new form, of brass, with removable tip that unscrews and wooden mouth- 
piece. Length, 9V> inches ... ... . - ■ o 

BLOWPIPE, Brazing, of brass with stop-cocks for air and gas. Requires % inch gas supply. 
Size of air tube, ${* i"ch; of gas tube, %«, inch; length over all, 14 inches. . . 3.00 

BLOWPIPE, General Laboratory, of brass nickel-plated. The most convenient form of hand 
blowpipe or blast; of very light weight. Provides intensely hot flame, which is easily regu- 
lated in size and intensity from the finest needle flame to a large brush, by means of stop- 
cocks on the air and gas "tubes. Especially valuable in sealing glass and in repairing large 
pieces not easily handled. Total length, 9 inches; weight, 4% ounces. ............. . b.ou 

BLOWPIPE, Oxy-Hydrogen, all brass, on stand, with removable lime cylinder holder and two 

BLOWPIPE, Plattner's,' of brass nickel-plated, with hard rubber mouthpiece, but without plati- 
num tip. (See No. 1455 below) ■• • • ■ • ■ • ■ ■ •" • ■•• Aanani , 

BLOWPIPE TIP, of Platinum, for No. 1454, seamless, with small uniform hole. Price depend- 
ent upon the market price of platinum. 

81 



I 



I 









BLOWPIPES 



NTH 



AL 8CIBNTIFIC 00., CHICAGO, V. 8. A 

















I I 



1464. 
1466, 
1468, 
1470, 

147V 



14S4. 

1486. 

1488. 
1492. 
1496. 
1500. 

1502. 

l.-.OK. 

soo, 

1514 

1516. 

1518. 



1520. 




No. 1518. 

BLOWPIPE APPARATUS 

BLOWPIPE TIPS for burners, see Nos. 2228 and 2230. 

BUNSEN BURNER Poi blowpipe work, see general heading Burners. 

BUTTON BRUSH $100 

CARBON BLOCK, molded 40 

CARBON CYLINDER, molded, I%x3 inches 25 

CHARCOAL BORER, club Bhape 1.10 

CHARCOAL STICKS, 4x1 \' ... in.-hes Per dozen 1.10 

101 discount in lots of 144. 
CUPELS, Bone Ash. see No. 3628. 
CUPEL HOLDER, n wood.n support, with two molds and stamp of brass, nielcel-plated. 

Beight, about 3% inches 1.50 

FORCEPS. Blowpipe, nickel-plated, with platinum tips. Length 5 1 -.. inches. Price dependent 
upon market price of platinum. For illustration, see Forceps, page 245. 

HAMMER, Planner's, wooden han.ll-- 90 

MATRASSES. Glass, flask Bhape per dozen .50 

MINERALS for Blowpipe, 25 spe. imens, small size, in partitioned hardwood hox 3.60 

MINERALS for Blowpipe, 100 specimens, including all but the very rarest, each in tray, all en- 
closed i ii oak lnix 9.50 

PLATINUM WIRE, with solid glass handle, for borax beads, .ti-. .................... . .50 

PLATINUM GOODS, see general heading Platinum Ware. 

SCALE of Hardness, without diamond, 9 specimens 3.15 

STREAK PLATE, unglazed porcelain, 60x100x4 mm thick 48 

TUBES, haul glass, 4\> , in. Ins, open at both ends per dozen .55 

TUBES, hard glass, 4x% inches, closed at one end peT dozen .90 

BLOWPIPE SET of Apparatus and Reagents, as designed by Trof. Butler of the Colorado School 
of Mmii-s f..r iiv in tin- laboratory and field. The various pieces art- compactly arranged in a 
ease with compartments and receptacles, especially designed to avoid breakage." Outside dimen- 
sions, 11 %x6%x2% inches. Complete with wet and dry duxes, and with lamps for alcohol and 

oi • ; 30.00 

The set contains the following pieces: — 

piaSunl Wires and Holds, ^Arsenic Tube. gSfi jS2?\ •„ S iSmUth F,U * 

C'..i..i>i.,»ti.... charcoal Borer. 2 Sticks ChawSnl V, i' V '' A Cid S°5" x • n- , w 

Maenet and Chisel ' 6 OpS TSbe? N l\ \ "', ^ dd Potass,.,.., B.sulphate 

Streak Plate ,„ ', T ' , ' Nl1111 A cid Oil Lamp (brass) 

Blue Litmus {JS tS V.T 5? • . , £°° ho1 »"» «*""» 

Red Litmus i . A', Microeoamfc Salt Hhiumut 

tua uiuaus Ammonium Hydrate Sodium Carbonate Platinum Tipped Forceps 

POCKET HAND-BOOK OF BLOWPIPE ANALYSTS k,. n *r ♦ « *, *r tp ior 

BOATS. Combustion. Be « CombusUon Boats " b> G " Monta S™ Butler, M. E L25 

BOILERS, see Kettles. 
BOLTING CLOTH, see Sieves. 

82 









■f. 



111 

I 
J 

- 

i ha 

li 
I 

rtet * 

u 

u 

■ ' 

IS 

I 






CENTRAL SCIEXTIFIC CO, CHICAGO, U. S. A. 



BOTANICAL 




1530, 



1532 



1533. 



1536. 



1538. 



1540. 



1548. 



ir>49. 



1552. 



1554. 



1556. 



1558. 



No. 1536. 





2.50 

.60 
1.80 

1.25 
3.70 



No. 1556. No 1538i 

BOTANICAL APPARATUS 

BOTANICAL ABSORPTION PAPER, 11x16 inches, as use.] i„ No. 1558 Plant Press. Heavy 
felt paper, very absorbent per 25 sheets $0.85 

-r>* m . „,,„ . " P e * 100 sheets 

BOTANICAL ABSORPTION PAPER, good quabty blotting paper, size, 12x11) inches. 

per 25 sheets 

■r,~ m . ,„ P e r 100 sheets 

BOTANICAL ABSORPTION PAPER, same as No. 1532, but in sheets 19x24 inches. 

per 25 sheets 
___ A per 100 sheets 

BOTANICAL ADHESIVE TAPE, in rolls of 10 yards, % inch wide, gummed, readv for use. 
Made of white cloth, easily cut and readily applied, presenting a neat and inconspicuous ap- 
pearance on tin- mounting sheet. In box with slot enabling it to be withdrawn in anv amount. 

20% discount in lots of 12 per roll .40 

BOTANICAL COLLECTING CASE (Vasculum), of metal, finely enameled in green, with door 
opening entire length. Size 15%x5x7% inches. Complete with leather shoulder strap and 

* na I >s 2.80 

BOTANICAL GENUS COVERS, of heavy manila paper, with surface specially prepared for 

writing upon. Size folded, 12x18 inches per 25 sheets .80 

per 100 sheets 2.30 
BOTANICAL MOUNTING BOARD, good quality Bristol board, plain. Size, 11x17 inches. 

per 25 sheets 1.70 
per 100 sheets 5.00 
BOTANICAL MOUNTING BOARD, same as No. 1548, but with printed form for plant descrip- 
tion. Size, 11x17 inches per 25 sheets 2.35 

per 100 sheets 7.00 
BOTANICAL MOUNTING PAPER, of heavy unsized stock, strong and durable. Color does not 

deteriorate with age. Size, 11x17 inches per 25 sheets .57 

per 100 sheets 

BOTANICAL MOUNTING PAPER, heavy weight paper of grayish color, unsized surface. 

11x17 inches per 25 sheets 

per 100 sheets 

BOTANICAL MOUNTS, Riker's, suitable for mounting any botanical specimen. The mount con- 
sists of two parts — a thin plate of photographic glass to which narrow flaps of linen morocco paper are 
neatly fastened, and a cardboard hack to which is glued a thin layer of sterilized surgical cotton in which 
the specimens are imbedded. 

No. A. 

Siie. inches 5x6 

Each .28 

Per dozen . ,_ , 2.80 

For other MOUNTS, see Specimen Mounts. 

BOTANICAL PLANT PRESS, simple, strong, portable, and satisfactory. Made of lattice work. 
It dries very rapidly, especially when used with No. 1530 Absorption Paper. Huns; in sunlight or over a 
heater, specimens can be dried .so rapidly as to preserve natural colors From one to fifty or more speci- 
mens may be pressed at one time. Size. 11 ; ',\16% inches. Complete with straps as illustrated 2.76 

83 



L70 

Size, 

.35 

1.10 



B 


C 


D 


6 % x8 % 


8x12 


12x16 


.36 


.60 


1.20 


3.60 


6-00 


12.00 







BOTANICAL 



CENTRAL SC1KXTIFIG CO., CHICAGO, U. 8. A. 






No. F8841. 



No, F8847. 







156° BOTANICAL PRESSING PAPER, thin white absorbent paper, folded and cut, for use with No. 

1530 Absorption Paper per lOO sheets $0.50 

1564. BOTANICAL SPECIES COVERS, of manila paper, size folded, U%xl7% inches. 

Per 100 sheets 1-20 

HERBARIUMS. Made in two sizes, 7%x9% inches, ami 11x17 inches, uniform in design with 
the Atlas Note Book^. Th- portfolio form permits the specimens to Demounted scientifically 
acording t«> the genua and species to which they belong. The plan also permits ad. ling to or 
removing from the collection at any time. Hints on collecting, pressing and mounting speci- 
mens arc found on inside cover pages. Each sheet contains a legend for classification, and an 
index is furnished. 

No A B 

Atlas No 709 1117 

Size, inches 7%x9% 11x17 

No. Of sheets 40 25 

F8841. HERBARIUM, complete, as described above each .45 .70 

per dozen 4.20 6.72 

F8B48. HERBARIUM COVERS, only per set .22 .27 

per dozen sets 2.10 2.64 

F8843. MOUNTING SHEETS, only per package of 100 .70 2.50 

per dozen packages of 100 each 6.72 24.00 

F8847. PLANT DESCRIPTION PAPER, with Bpacea on oue side for complete analvsis of a plant; the 
other side unruled. ~'-\\'y\ inches, perforated for Mos. F8811 or F8842A Covers. In envelope 
of 20 sheets per envelope .12 

per dozen envelopes 1.08 




CATALOG A. 

APPARATUS 



AGRICULTURE 

19 Biology 




f-MNUEACTVIirD ANT* V)LD PI THE 

Central Sgenific Company 



> f***-*t*lt L Vi 




~ "—^ -T^rt.-;.." ■*■*—* — { 



CATALOG A. 

Catalog A, illustrated here, is a complete catalog of those items which 
are of specific interest to laboratory workers in the fields of Botany, 
Physiology, Zoology and Agriculture. In its 227 pages are contained 
much of the material scattered throughout Catalog C, and because of its 
smaller size and more Limited scope it may be found more convenient to 
use by those primarily interested in these special fields. In addition it 
contains certain special sections of apparatus not included in C, such as 
Animal Husbandry; Charts for Botanv, Physiology and Agriculture; For- 
estry Instruments; Insect Specimens and Life Histories; Anatomical and 
I hysioh.gH.al Models; Poultry Husbandry; Pruning, Budding and Graft- 
ing Tools; Score Cards for Judging Animals, etc ; Seed and Grain Speci- 
mens; [ repared Slides for the Microscope and Projection Lantern; Spray- 
ing Apparatus. - 

This catalog will be sent post paid to anv teacher of the subjects 
mentioned, any experiment station investigator, or to the head of anv 
Sesefieldfl ^ COmnu ' rcia1 ' whose work ****** over into any of 

Note— For notices of ot her catalogs, see page 68. 311 and 375. 

84 



m 



ter&JM 






,fir - t- 



§A^i«H-*t 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BOTTLES 







No. 1574. 



No. 1578. 




No. 1582. 



No. 1584. 



No. 1586. 



BOTTLES FOR GENERAL USE 



1574. BOTTLES, narrow mouth, round, flint glass. 

Capacity, ounces j _. 

To take cork stopper, No... (f 

Per dozen $o.65 

33i£% discount in case con- 
taining 864 



1 


2 


4 


6 


8 


12 


16 


32 


64 


1 


2 


4 


4 


5 


6 


6 


8 


13 


.70 


.77 


1.06 


1.22 


1.40 


1.78 


2.00 


3.05 


4.00 



864 720 432 360 



1576. BOTTLES, narrow mouth, round, flint glass. 

Capacity, gallons 

To take cork stopper, No 

Each 



288 216 144 72 



33l£% discount in case containing 



1578. BOTTLES, wide mouth, round, flint glass. 

Capacity, ounces y. 2 \ 2 

To take cork stopper, No... 7 10 11 

To take rubber stopper, No.. 2 4 5 

Per dozen 67 .73 .80 

33%% discount in case con- 
taining 864 



4 

14 

6 

1.12 



10 
.35 
36 

6 
15 

7 

1.28 



1 
13 

.50 
24 



2 

15 

1.50 
12 



8 

20 
8 

1.45 



12 
18 
8 

1.88 



16 
22 
9 

2.12 



32 
26 
11 

3.15 



48 

5 

18 

2.50 
6 

64 

2%" 
13 

4.20 



864 720 432 360 288 216 144 72 48 



1580. BOTTLES, wide mouth, round, flint glass. 

Capacity, gallons 

Each 

33%% discount in case containing 



y 2 

.30 
48 



1 
.50 
24 



2 

1.35 
12 



1582. BOTTLES, extra wide mouth, round, flint glass. "Specimen Bottles " 

Capacity, cc ;>,(> .-,,, 75 

Diameter of body, mm 43 

Height over all, mm 50 

To take cork stopper, No. 13 

To take rubber stopper, No 6 

Per dozen 1.00 

33%% discount in case containing 864 



50 

60 

15 

6 

1.10 

720 



57 

65 

15 

6 

1.25 

576 



1584. BOTTLES, tincture, flint glass, mushroom stopper. 

Capacity, ounces 1 

Per dozen 2.05 

33ix,% discount in case containing 864 

Capacity, gallons 

Each 

33%% discount in case containing 



2 

2.25 
720 



4 
2.75 
432 

Vi 

.90 

48 



100 

62 

70 

22 

9 

1.50 

432 



8 
3.35 
288 



150 
66 
85 
22 
9 
1.65 
360 



16 

4.70 

144 



1 

2.50 

24 



1586. BOTTLES, tincture, flint glass, squat form, with flat topped glass stopper. 



Capacity, cc 30 60 125 

Per dozen 2.25 2.40 3.10 

33%% discount in case containing 864 720 432 

Capacity, cc 2000 

Each 1.25 

33%% discount in case containing 48 



250 

3.90 

288 
4000 
3.00 
24 



500 

5.10 

144 



5 

2.80 

6 



200 

70 

96 

22 

9 

1.75 

288 



32 
6.45 

72 

2 
4.50 

12 

1000 

7.10 

72 

8000 

5.25 

12 



85 






BOTTLES 



CENTR 



ITRAL scientific 00., CHICAGO, P. 8. A. 





I 











ink < 



No. 1588. 
No 1592. 



No. 1594. 




No. 1596. 



No. 1598. 



No. 1612. 




No. 1611. 













1588. BOTTLES, tincture, flint glass, with roa^-nt stopper. 
Capacity, ounw - 



1590, 



1592 



1594 



1596. 



1598. 



1610. 



1612. 



1614. 



2 

2.25 
720 



4 
2.75 
432 



4 

2.75 
432 



Per dozen $2.05 

S3V&% discount in case containing 864 

( Opacity, gallons 

Each 

33%% discount in case containing 

BOTTLES, tincture, of amber glass, with mushroom Btopper 

< 'apacitv, ounces ■ 1 - 

Per dozen 2.05 2.25 

33%% discount in case containing 864 720 

BOTTLES, narrow mouth, green glass, with vertical Btopper, for aeida, 

Capacity 16 t)Z - 40 oz 5 pint 

Each . 

33%% discount in case containing 

BOTTLES, salt mouth, llint glass, mushroom stopper. 

< lapacity, ounces 1 

Per dozen 2.10 

33' H '; discount in case containing 864 

Capacity, gallons 

Each . 

33%% discount in case contain* ng 



8 
3.35 

288 

'_■ 
.90 

48 



8 
3.35 

288 



16 
4.70 

144 



16 

4.70 

Hi 



.30 

72 



.50 
48 



.60 
36 



lgal 

1.10 

24 



2 

2.40 
720 



4 

2.85 
432 

1.00 
48 



8 
3.50 
288 



16 

4.75 
144 



1 

2.75 

24 



BOTTLES, salt mouth, flint glass, squat form, with flat glass stopper. 

Capaeity.cc ::n tin 125 

Per dozen 2.40 2.60 3.50 

33%% discount in case containing 864 720 432 



250 

4.00 
288 



.-mi 1 

5.20 

144 



32 
6.45 

72 

1 

2,50 

24 



32 

6.45 

72 



2 gal. 

2.25 

12 

32 
6.90 

72 

2 

5.00 

12 

1000 
7.50 

72 



BOTTLES, wide mouth, hollow ground glass stopper, enabling spoon or spatula to be kept in bot- 
tle. Complete with horn apoon. 

< apacitv, ounces 

Each . ". ...'.'. 

Per dozen 



2 

.35 
3.50 



4 

.70 
7.00 



C 
2 

3.30 



D 

3 

5.00 



E 
5 
10.00 



BOTTLES, Aspirator, of heavy glass, with tubulaturn at l.ottom 

No A B 

Capacity, gallons 1 ., j 

Each 1.30 1.90 

BOTTLES, Aspirator, of heavy glass, with glass Btopper and glass stop-cock ground in tubulature. 
Capacity, ounces s *« 32 

Each • • ..'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'. 3.00 3.20 &50 

Capacity, gallons 1. 1 , o 

" n 4.50 6.60 9.00 12.50 

BOTTLES Aspirator, of heavy glass, with narrow outlet for connecting rubber tul.ing. 
(apacitv, ounces 4 g 8 f fi 

r. " -1 ,*, 80 .90 .95 

Capacity, gallons , , 

1.40 2.50 



Each 



5 
16.00 

32 

1.20 

2 

3.50 



86 



tlSil 






■ 




h.M 



16 


■■ 


•-■ 


•■ 


Ui 


■. 




: 




23 




I 




1 


l;o 


M 


i« 


3 


1 




) 






- 


i$ 


2 


75 


u 


a 


1 




l 




il 




B 




1* 


20 


til 


u 


a 




ito 




! 




• 




?i 



I 1 

* 

:: 



t 
1* 



CENTRAL SCIENTIFIC CO, CHICAGO, U. S. A 






No. 1618. 



No. 1620. 



No. 1622, 





No. 1634. 




No. 1638. 



No. 1640. 



BOTTLES FOR SPECIAL USES 



BOTTLES 




No. 1624. 




No. 1645. 



1618. 
1620. 

1622. 
1624. 



BOTTLE, Balsam, with glass cap, and loosely fitting glass dropper. Capacity 30 cc $0 5O 

*£oSf ^ap^v^eo 7 Uth :. W[th . glaS3 :.° d . &nd glaSS CaP gr ° Und t0 fit a 8 ainst Moulder 'of 

BOTTLE, Dropping, with Barnes' pipette stopper, square shape. Capacity, 30 cc 10 

20% discount in lots of 12. 

BOTTLES, Dropping, with ground in pipette, with rubber bulb. 

Capacity, ce 

Each . *. 



1634. 



20% discount in lots of 12. 

BOTTLES, Dropping, «'TK", with grooved flat glass stopper. 

Capacity, cc 30 

Each 30 

20% discount in lots of 144. 



30 
.40 



60 
.45 



60 
.35 



100 
.40 



1638. 



30 

.25 



60 
.40 



100 
.45 



1640. 



1641. 



1645. 



BOTTLES, Dropping, "TK", with grooved vertical stopper. 

Capacity, cc 

Each . '. ....... t 

20% discount in lots of 144. 

BOTTLE, Dropping, Schuster's, with ground-in glass stopper. Capacity, 30 cc 40 

20% discount in lots of 12. 

BOTTLE. Dropping, Schuster's, without stopper. Capacity, 30 cc 20 

20% discount in lots of 12, 

BOTTLES, Gas Generating, sec Gas Generators. 
BOTTLES, Gas Washing, see Gas Washing Bottles, 

BOTTLES, Homeopathic Vials, short form. 

Capacity, drams 1 2 

Dimensions, mm 12x14 58x16 

To take cork stopper, No 2 3 

Per gross 1.60 1.90 



3 4 6 
64x19 68x20 80x22 

4 4 5 
2,50 3.70 5.00 



8 
83x24 

6 
6.10 



87 






BOTTLES 



CENTR 



AL SCIENTIFIC CO.. CHICAGO, P. & A. 









No. 1648. 



No. 1651. 



No. 1654. 



1648. 
1651. 






1654. 






1656. 
1658. 






1561. 






1663. 
1664. 

1666. 





No. 1658. 



No. 1661. 



No. 1666. 



BOTTLE, Immersion Oil, unspillable, with wooden stopper and wire dropper $0.80 

BOTTLE, Immersion Oil and Dropping Combined, of glass with loose-fitted nickel-plated cover 
carrying pointed dropper. The small inner container is sealed into the outer jacket and is 
enlarged so that the small amount of oil in it will not run out when the bottle is turned over. 
The outer vessel is intended to contain alcohol, xylol or other solvent and the rate of flow 
through the small spout may be controlled by placing the finger on the larger opening. .90 

10% discount in lots of 12. 

BOTTLES, Insect, bent neck. 

Capacity, ounces V* ~ 

Dimensions, inches 3x :l i 5^4x1*4 

Per dozen 1.00 135 

207c discount in lots of 144. 

BOTTLE, Insect, cyanide, for collecting and killing, 4 ounce, ready for use -30 

BOTTLE, Measuring, designed by C V. Bockius, of the Underwriters' Laboratories, for rapidly 
measuring and delivering a certain quantity of reagent where an approximate measurement 
is sufficient. An air opening is provided at the top for controlling the flow. Graduated to 25 
cc in 5 cc divisions. Capacity of bottle, about 250 cc 5.00 

BOTTLES, Mixing, see Cylinders. 

BOTTLES, Oil Sample, clear flint glass, with rounded shoulder and concave bottom. 

Capacity, ounces 2 4 

Per dozen .80 1.00 

20% discount in lots of 144. 

BOTTLES, Oil Sample, 4 oz. capacity, same as No. 1661, but washed and corked.. per dozen 1.40 

20% discount in lots of 144. 

BOTTLES, Oil Sample, 4 ounce size, clear flint glass, with square shoulder and flat polished bot- 
tom. Cleaned and fitted with corks per dozen 3.00 

20% discount in lots of 144. 

BOTTLES Pressure Lintner's, for digestion under pressure, with glass cap and rubber gasket, 
mounted in brass frame. Capacity, 125 cc 5.00 



8 
1.40 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



BOTTLES 






No. 1674. 



No. 1690. 



BOTTLES FOR REAGENTS 

BOTTLES, Reagent, with raised letters blown in the glass with surfaces ground. These bottles 
are made according to 8 special formula and are much harder and more brilliant than the ordi- 
nary bottle glass and will show no free alkali. Only those bottles with labels listed below are 
manufactured. 



PLEASE ORDER BY BOTTLE NUMBER. 



1674. BOTTLES, Reagent, narrow mouth, 4 oz., height, 5% inches 



C. ■. ■ 

lilted am 

_•: ; '. ' 

: 
ling. * 



II 






iawlt»5 



■0 



U 



2 '8 



per dozen $2.50 
per gross 23.75 



No. 

3. 

30. 
439. 

18. 

17. 

15. 

82. 

19. 

16. 

31. 

97. 

33. 

20. 

32. 
401. 
406. 

21. 

23. 

22. 

83. 
433. 
407 
408. 
409. 

36. 
421. 

35. 

58. 

29. 

28. 

2. 

419. 

429. 

428. 

1. 

87. 
414. 

27. 
410. 

9 0. 
438. 



Acetic Acid HC0H3O0 

Alcohol CViHsOH" 



Ammonium 
Ammonium 
Ammonium 
Ammonium 
Ammonium 
Amnion ium 



Acetate NH4C0H3O0 

Carbonate (NH 4 )-.C0 3 

Chloride NH4CI 

Hydroxide XH+OH 

Molybdate (NH 4 ) <]Mo T 2 4 

Oxalate (NH 4 ) 2 C 2 4 

Ammonium Sulphide (Amber) .(NH 4 ) 2 S 

Ammonium Sulphocyanide NH4CNS 

Ammonium Sulphydrate NH*HS 

Barium Carbonate BaC03 

Barium Chloride BaCl 2 

Barium Hydroxide Ba(0~H)* 

Barium Nitrate Ba(N03)~2 

Bromine Water. 

Calcium Chloride CaCl«» 

Calcium Hydroxide Ca(OH) 2 

Calcium Sulphate - -, ■--C>80| 

Carbon Disulphide CS 2 

Carbon Tetrachloride C CI4 

Chloroform CHCI3 

Cochineal. 
Coralline. 

Cnpric Sulphate CuS0 4 

Dimethyl Glyoxime (CH-O-C^NOHJo 

Ether (CjH.-J-O 

Failing's Solution, 

Ferric Chloride Fe-.Cl,i 

Ferrous Sulphate FeS04 

Hydrochloric Acid HCI 

Hydrochloric Acid, Con HCI 

Hydrochloric Acid, Dil HCI 

Hydrogen Peroxide 

Hydrogen Sulphide (Amber) -HoS 
Indigo Solution. 

Iodine Solution I-J-KI 

Lead Acetate Pb(C 2 H30 2 ) 2 

Litmus. 

Magnesia Mitxure. 

Magnesium Chloride MgCl 2 



No. 

24. 

25. 
100. 

86. 
415. 
411. 

88. 

5. 

422. 

430. 

93. 
423. 
412. 

94. 

37. 
8. 

96. 
432. 

13. 

11. 
6. 

12. 

10. 
9. 
7. 

26. 
404. 

60. 

59. 
416. 

61. 

14. 
417. 

81. 

4. 

420. 

431. 

413. 

56. 

38. 



MgS0 4 
HgCI* 



Magnesium Sulphate 

Mercuric Chloride 

Mercuric Potassium Iodide. 

Mercurous Nitrate HgN03 

Methyl Alcohol CH 3 0H 

Methyl Orange. 
Nessler's Solution. 

Nitric Acid HNO3 

Nitric Acid, Con HNO3 

Nitric Acid, Dii HNO3 

Oxalic Acid , H*CM>4 

gheno] C<fHftOH 

Phenolphthalein. 

Picric Acid HC«H 2 (N02) 3 

Platinic Chloride PtCU 



Potassium 
Potassium 
Potassium 
Potassium 
Potassium 
Potassium 



Carbonate K2CO3 

Chromate K 2 Cr04 

Cyanide KCN 

Dichromate KoCmOr 

Ferricyanide K3Fe"(CN) tf 

Ferrocyanide K 4 Fe(CN)o 

Potassium Hydroxide KOH 

Potassium Iodide KI 

Potassium Sulphate K2SO4 

Potassium Sulphocyanide KCNS 

Silver Nitrate (Amber) AgN0 3 

Silver Sulphate -- Ag 2 S04 

Sodium Acetate NaC 2 H30 2 

Sodium Carbonate Na 2 C03 

Sodium Cobaltic Nitrite. 

Sodium Hydroxide NaOH 

Sodium Phosphate — -„— Na 2 HP04 

Sodium Thiosulphate Na 2 S 2 03 

Stannous Chloride SnCl 2 

Sulphuric Acid H0SO4 

Sulphuric Acid, Con HoSO* 

Sulphuric Acid, Dil H2SO4 

Turmeric. 

Uranium Acetate U0 2 (C 2 H 3 0)2 

Blank. 



^ 



.•■• 



so 



BOTTLES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. B. A. 






1676. BOTTLES 



used 
20 



ttt-S Rodent 4 07 Mt of 40 Ro.^.nt BottltB No. 1674, i .ulu.lin- tlu* nOSl moil liamGg 

TLEb, Reagent, 4 oz., mi *« ~ „ - s (| ,,, ,, ,., - ( ,, ,- , . ... 

,t hl the chemical laboratory: No*. L M, 5, « f 7, -. . . -. . 14, . ■>>, 1, Is W 






1678. 



16vn 



JVT 22, WT^ 26,27, 28,29; 30, 31, 32, 33, 30, 36, 5!., 61, aud 8 blank. per set $8.30 

twvtttes Reaeent 4 oz set of 24 aecording to FresaniM, including Nos. 8, 3, 4. :,. .;. :. 13 l4 
T ™ "!W ■?«! ^ 86, ,7. 89, l{ B6, 59 lid 61 per set 5.00 

BOTTLES Reagent, 4 oz., set of 12, .W.st !,.« »f Sob. I, -. . I, 5, 15, 16, 20, 23, 26, If ailll 8 

. . per set 2.50 



1682, BOTTLES, Reagent, narrow mouth. 3 oz., height, HVj inches 



per dozen 3.20 
per gross 30.40 



No. 
131, 

126. 

no. 

109. 

108. 

155. 

ISO. 

158 

122. 

114 

151. 

159. 

I.I 

105. 

106. 

107. 



Uetk Acid I^S^S* 

\Kohol l ■_■":,< »M 

Ammonium Carbonate i/SrAi 2 8 

Ammonium Chloride isH 4 (I 



A mini.. mum 
Ammonium 
Ammonium 
Ammonium 
Ammonium 



Hydroxide NH.oH 

Molvhtlute (NH^,M":" 

Oxalate (NH 4 ) 2 C 

1 hospbate (NH«>_HP0 4 

Sulphide (Amber) (NH 4 >jS. 

Barium Chloride BaCla 

Cniiium Hydroxide Ca(OH)2 

Ether - (« ti ..O 

Ferrous Sulphate FeS0 4 

Hydrochlori. A . i-i. Con HCI 

Hydrochlorii l» Id, I >» 1 HH 

Hydrogen Sulphide ( Amber) -H*jS 



No. 

152, 

153. 

104 

171. 

H*n. 

L72 
173 

i 15 

1 \2 
111 

101. 

1 - >2 . 
116 



Loari Aretnto |M, ( i I 

Mercuric chloride Ii. 

Nitric \< Id, Con iiv 

Nitric Icid, Dil HNO 



Potassium 

INitHKSiuill 

Potassium 

PotaiNMUin 

Potasaiuin 



I -boiiate K « O 

Chromate - 

Pari «■ yanidc K r. 

Perrocyanide K 4 Fe(< Si* 

Hydroxide KOB 

Silver Nitrate < Amber) 

:ii!n \ arbonate Na^i u 

Sodium Hydroxide NaOH 

Sodium Phosphate - . NasHPO* 

Stannous Chloride KnCI* 

Sulphurii \- id, i on HjS0 4 

Sulphuric Acid, i»»i H ><i, 

Blank 



ir.s4. BOTTLES, Reagent, narrow mouth, 1G oz. (pint >, height, 7 :t » inches 



per dozen 4.50 
per gross 42.75 






No. 
237. 

239. 
241. 
235. 
234. 
204. 
227. 
258. 
236. 
218. 
22:i. 

225. 

23'). 

224. 
217. 
222, 



Acetic Acid HC2H3O* 

Alcohol C 2 H$OE 

Ammonium Acetate XH t C_H 1O2 

Carbonate (UH^COa 

Chloride NH4CI 

Hydroxide NH 4 nH 

Hydroxide, Dil NH^H+A.j 

Oxalate (NH 4 ) < n A 

Sulphide (Amber) < NH,);S 

oride BaCls 

Calcium Hydroxide Ca(OH)j 

Calcium Sulphate CaS0 4 

Ether c n 1 o 

Ferrous Sulphate FeS0 4 

Hydrochloric Arid HCI 

Hydrochloric Acid, Con HCI 



Ammonium 
Ammonium 
Ammonium 
Ammonium 
Ammonium 

Ammonium 
Barium Cli 



No 
281. 

226. 
216. 

219. 
232 

238, 
221. 

240. 
260 
2 
228 

215. 

2'JH 

242 
211 



Hydrochloric Acid, i»ii n< 1 

Hydrodiaodic Phosphate Na HPOj 

Nunc Acid HNn 

Nitric Acid, Con HXO3 

Nitrh Acid, I > i 1 11\ 

Potaaaium Bichromate K_-< >_■• » : 

Potaaaium Chromate 1 »/ 

Potaaaium Hydroxide KOH 

Silver Nitrate (Amber) \_\<> 

Sodium Carbonate - ? 1 

Sodium Hydroxide S lOH 

Sodium Hydroxide, Dil NaOH+Aq 

Sulphurii Acid , , 11 Si 1 

Sulphuric Acid. Con H SO< 

Sulphuric Acid. 1 >i I lfso. 

Blank. 



1686. BOTTLES, Reagent, narrow mouth, 32 oz. (quart), height, 9C> inches per dozen 6.50 



No. 

r. 1 2 

:,o« 
503 



Ammonium Hydroxide XH 4 OH 

Hydrochloric Acid, Con HCI 

Hydrochlori. Acid, 1 > i 1 HCI 

Nitric Acid, Con HNO :i 



No. 

504. 

501. 

502. 

511. 



Nitric Acid, I>il 

Sulphuric Acid, Con 
Sulphuric Acid. Dil 

Blank 



H\o 

H L >S0 4 

B 



1690. BOTTLES, Reagent, wide mouth, 4 oz., height, 4% inches per dozen 2.80 



No. 

314. 

304. 

305. 
303. 

:i<>2. 



Ammonium Sulphate (NH 4 )-S(> 4 

Borax Na 2 B 4 0; 

Ferrous Sulphate FeS0 4 

Potassium Cyanide KCN 

Potassium Nitrate KNO3 



No. 
313 
301. 
312. 

307. 



Sod. Am. Hyd, Phos. 
Sodium Carbonate 
Test Paper. 

Blank. 



(NH»iHPO 4 + 4H-0 

KasCO 



IrtsM 



BOTTLES Reagent, narrow mouth, with special labels. Bottles are made in the same molds as 
the labeled Eeagent bottlea Nob. 1674 to 1686 inclusive, but with special wheel rut labels as 
desired. As these bottles are only made to <»rder, about two weeks' time i- required for de- 



Capacity, ounces 
Per dozen 



4 
5.35 



8 
6.00 



lfi 
8.25 



32 

10.25 



16i>2 



1694 



B W^S* Rea ? e J 1 ^ ™<Y mouth capacity I ounces, with special labels. Identical with Xo. 1690 
twi^if?S ^l<-ut labels as desired. As these bottles are only made to order, about 

two weeks time is required for delivery \ per dozen 5 .65 

CAPS for Reagent bottles. 

For bottles of capacity, ounces 4 

Height inside, millimeters " - s 

Diameter inside, millimeters ■>' . 

perdozen ...::::::::::::: ^ 



8 


16 


32 


64 


65 


70 


40 


4.'. 


50 


2.30 


2.40 


2.50 



«»0 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A, 



BOTTLES 



•^ 



'i 



*u 



M| 






i ' 



"I 









No. 1710. 



No. 1712. Nos. 1714-5. No. 1716. 



No. 1718. 



No. 1720. 



Nos. 1722-4. 



0i 



U 



' w u 






[4 






tdoxo 13 



i 
•S 1* 



■ dow i* 



1.HTO.- 



eqilirrf ftf * 



1* 
- 



•;.- 



«dM« *" 



16 
1*0 



J 



1710. BOTTLES, Hard Rubber, square, with tight screw cap, lor hydrofluoric acid. 



Capacity, ounces 
Each 



4 
$1.25 



1712. 



( apacity, drams 
Dimensions, inches 
Per dozen 



8 
1.70 



BOTTLES Screw-Cap Vials, with cork lined aluminum screw cap. 

1 2 4 8 

"...'. l%x% 2%x% 2%x% 3%x% 

.30 .40 .55 .90 

3.30 4.00 5.60 9.00 



16 
2.10 



12 

5ViX% 
1.20 
11.80 



1714. 



Per gross 

BOTTLES, Serum, or Vaccine, of amber glass. All capacities have same size neck, taking the 

same stopper. 
Capacity, cc •••••• 1*£ ^ g ™ 



1715. 
1716. 



Per gross 

RUBBER STOPPERS, special form for Serum Bottles No. 1714 ..per gross 1.80 

BOTTLES Serum or Vaccine, made of a glass with low alkali content. Furnished with special 
red rubber stoppers perforated almost to the top so that a hypodermic needle may be readily 
inserted The small opening thus produced closes after the needle is removed so that there 
is no danger of contamination of the liquid remaining in the bottle. 



Size. CC . 
Per dozen 



30 
1.90 



1717. 



1718. 



20% discount in lots of 144. 
RUBBER STOPPERS, special form for Serum Bottles No. 1716 per dozen 



fin 

2.00 



.65 



20^ discount in lots of 144. 



BOTTLES, Shell Vials, round, straight wall. 

No 

Capacity, drams • 

Capacity, cc, about 

Takes cork No 

Per dozen 



A 

1 

4 

3 

.10 

1.10 



— 



3 

.10 
1.10 



c 

3 

11 

4 

.15 

1.60 



D 

4 
14 

5 
.25 
2.40 



1720. 



Per gross 

BOTTLES, Show, Inverted, for storing and exhibiting sample grains, chemicals, etc. 

% V* " 

3*4 1% 

1% - 

.28 .32 



( 'a parity, pints . 
Height, inches . . 
Diameter, inches 

Each 

Per dozen 



6 
.40 



1 

7% 

2% 

.55 



2 

9 

3% 

.70 



4 
11 

4y 4 

1.05 



E 

8 

28 

10 

.40 

4.00 



8 

14 

5% 
2.10 



2.80 3.20 4.00 5.50 7.00 10.50 21.00 



1722. BOTTLES, Specific Gravity, unadjusted, with perforated stopper. 



Capacity, approx., cc 
Each 



25 
.60 



1724. 



BOTTLES, Specific Gravity, accurately adjusted at 20°C, with perforated stopper. 
n .. 10 25 

^ elt ^'^;;;;;;;; ;;;;;;;;;;;;;; ;;;;;; ;;;;:;; 90 1.10 

91 



50 

.80 



50 
1.50 



100 
.90 



100 
1.80 


















BOTTLES 



CENTRAL SCIENTIFIC CO., HUr.MiO, U. »■ A. 










No. 1725. 



No. 1728. 



No. 1730 



No. 1732. 



No. 1726. 



No. 1734. 



1725. 



1726. 



172S. 



1730. 



1732. 



1734. 



1736. 



1737. 

1740. 
1748. 







No. 1740. 



No. 1736. 



No. 1748. 



BOTTLES. Specific Gravity, same as No. 1724. in tin case with cooaterpota 

Capacity, cc . . 25 

Each , , $3.00 



50 
3.50 



BOTTLE, Specific Gravity, Barrett Type, 50 <•■• rapacity, for specific gravity of tar an. I pitch. 
(See Journal of Industrial & Engineering Chemistry, Vol. V, No. 3, for March 1913, page 
195) * 1.60 

BOTTLES, Specific Gravity, Boot's, double walled, with vacuum, maintaining constant tem- 
perature inside. With perforated stopper and ground cap. 

Capacity, cc • - " ^0 

Each 3.20 4.00 

BOTTLES. Specific Gravity. Geissler's, with thermometer reading from 8° to 4"°<\ in Jfc" 
ground in central neck, and cap ground on side neck. 

Capacitv, cc 25 

Each 3.30 3.70 

BOTTLE. Specific Gravity, Hogarth's, specially recommended by the United States Bureau of 
Mines for coal and coke. Widely used for specific gravitv of iron ores. Capacitv, about 
100 cc .* 2.20 

BOTTLE, Specific Gravity, Hubbard's, for asphalts, bitumens, and dense oils. With glass stop- 
per concave on under side, with opening 1.6 mm to permit escape of air. Height. 7n mm; 
diameter, 22 mm ; capacity, about 24 ec 1-50 

BOTTLE, Specific Gravity, Le Chatelier's, for cement, special form recommended by the 
United States Bureau of Standards and the American Society for Testing Materials. (See 
Circular No. 33 of the United States Bureau of Standards and Standard Specifications for 
1921 of the American Society for Testing Materials, No. (' 9-21) 5.10 

BOTTLE, Specific Gravity, same as No. 1736, but standardized by the United States Bureau of 
Standards, with certificate 9-50 

BOTTLE, Specific Gravity, NicoUs Tube, for liquids .70 

BOTTLE Specific Gravity, Sprengel's, with ground-on suction tube, and ground caps. Height 
over all, about 100 mm; diameter of tubes, 14 mm . . 1.50 





BOf 


■■- 


BOT 




SPE 




1 
i 




< 



92 



wggs-ca^fs* 



Ss&SP l G& s i£gm£ 



s*S&=*£ 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BOTTLES 







No. 1754. 



No. 1764. 



No. 1752. 



No. 1750. 



1750 
1752 
1754 



1756 



1758. 



1764. 



1766. 




ENTRAl 





No. 1756. 



No. 1758. 




No. 1766. 



BOTTLE, Specific Gravity, Walker's, for very fluid liquids, as described in Bulletin 109 of the 
Bureau of Chemistry, United States Department of Agriculture. Capacity, about 20 ec. $2.50 

BOTTLE, Specific Gravity, Walker's, same as No. 1750, for very viscous liquids Capacity 
about 30 cc 2 90 



SPECIFIC GRAVITY BOTTLE, Weld's Precision. For the precise determination of the density 




per cent., or with twice the accuracy of those made with a flat stoppered " bottle similarly 
capped. Capacity, about 25 ec 2 Q0 

BOTTLES, Specimen or Sample, of glass, round, with cork-line. I aluminum serew-eaps ' 

Capacity, ounces 1 2 4 g lfi 

Height, inches 3% 3% 4% 4 n< 5% 

Diameter, inches \% 1 1/, 1 7<. .. 1/ ^{l 

Per dozen 1.00 Lib 1.35 i~80 2 70 

15% discount in lots of 144. 

BOTTLES, Specimen or Sample, of glass, square, with .oik lined aluminum screw-caps. 

Capacity, ounces 1 2 4 g 

Height, inches 2% 3% ±% 5%, 

Side, inches \% \\., na/ m 2M« 

Per dozen 1.00 1.1b 1.35 { 6Q 

15% discount in lots of 144. 

For other SAMPLE BOTTLES and JARS, see Jars, Sample; also Boxes, Sample. 

BOTTLES, Sputum, see No. 2757. 

BOTTLES, Vacuum or Thermos, see Vacuum Bottles. 

BOTTLES, Sterilizer, see No. 12391. 

BOTTLES, Volatile Liquid, glass stoppered with ground-on glass cap. 

Capacity, ounces g 1q 

Each 1.20 1.50 

BOTTLES, Washing, of Pyrex glass, with heavy neck, fitted with rubber stopper and movable 
delivery tube. Will stand more severe usage than those made of ordinary glass on account 
of resistance to temperature changes and mechanical strains, and are therefore more economi- 
cal to buy. 

Capacity, ce 500 1000 

Each 70 .90 

93 









I 






i 









BOTTLES 



CENTRAL SCIKNTIFir 00., CHICAGO, TT. B. A 





No. 1778. 



No. 1782. 



No. 1768. 



No. 1770. 






No. 1784. 



No. 1786. 



No. 1788. 



No. 836 



176S. BOTTLES, Washing, of Pyrex yl.-iss:. with neck covered with wicker, for use with hot water. 

| apacity, ounces ]i; 30 

Each $1.30 i.5o 

1770. BOTTLES, Washing, all of glass, with ground connections, f«, r ether. 

Capacity, ounees 8 L6 32 

Each 80 1.10 1.30 

BOTTLES, Gas Washing. Bee Gas Washing Bottles. 

1778. BOTTLES, Water Sample, L' ounce , city, with Hat ground in Btopper. B..th stopper and 
bottle may be obtained numbered serially. In ordering, specify plain or numbered Lotties, 



and if the latter, state the series of numbers desired 

Nil 

Stylo ... 

Each 

Per dozen 



BOTTLES, Water, of stoneware, sec Jars. Stoneware 

1782. BOTTLES. Weighing, conical form, very light, grouud'in glass stopper. 
< apacity, cc 



. A B 

. plain numbered 

.20 .36 

2.15 3.90 



Each 



16 

.50 



1784. BOTTLES. Weighing, high form, flat bottom without „..,1r „r .,» i i i 

jy • wiinout neck, ground in glass stoppers. 



.55 



A 

15 

.35 



Height, mm 

Diameter, mm 

Each 

1786. BOTTLES. Weighing, low form, fiat I^^J^^^^^^'i^ 

Height, mm! "."."!!!! "£. _? J* E 

Diiir,— :::::::::::::::::: % 2 2 

Each -•' » 4n 30 

1788. BOTTLES, Weighing, extra wide, flat' boVton,'; .i.h^ut aeck, grounds e S ,<o VV Z 

Height, mm £ il 

Diameter, mm 

Each '..'.'.'.'.'.'.'.'.'.'.'..'. " , " 6 " 

836. BALANCE WEIGHING TUBE SUPPOPT „;.', ,' V"l" ","'.' 

xxlin^ lUBt, bUPPORT. nickel-plated, for horizontal or vertical use.. 

94 



60 
.65 

C 

so 

15 

.40 

G 

Ml 

40 
.80 

C 
30 
70 
2.00 

3.00 








CENTRAL SCIEXTIFIC CO.. CHICAGO, U. S. A. 



BOTTLES 




No. 1794. 



No. 1796. 




No. 1792. 




No. 1798. 





No. 1800. 



No. 1802. 




No. 1814. 




No. 1808. 






No. 1820. 



No. 1816. 




No. 1817. 



No. 1821. 



500 

1.50 



KtoO 
2.00 



2000 
2.90 



3.00 

4000 
4.00 



21X1(1 
3.30 



"~ "TO ZSSTS 2T* Wi,h C ° V " 8r °""" ""* - ™* ■" — «**• IH— 

$0.60 

.794. BOTTLE. Weighing Pipette, Grethen's Form, with glass stop-cock, for fuming acids; capacitv. 

2.20 

1790. BOTTLE. Weighing Pipette. Lunge ^withtwo stop-cocks, for faming adds, etc Capacity, 

1798. BOTTLES. Woulff's, of heavy gI aaSj with two'necks. 

L^P^ty, cc 125 2go 

EaC " 1.20 1.30 

1800. BOTTLES, WouliTs, „f heavy glass, with three necks. 

Ch 1-50 1.60 1.80 2.50 3.65 

1802. BOTTLES WouliTs, of heavy glass, with two necks and tubulaturc at bottom 

£*3J Clt7 ' cc • 250 500 1000 

BaC ° 2.00 2.10 2.60 

1808. BOTTLE REST Hard Rubber for use under acid bottles, etc., for protecting table tops. Diam- 
eter ins.de. 3% inches. Will take bottles up to 32 ounce or 1 liter. . . ... .30 

1814. BOWL, Porcelain, so-called pint size. Used in washing out gluten in flour analysis 40 

l816 ' B ° X J; S ^ i Aluininilm ' with alnminmn screw top, 2% inches in diameter by 2% inches high. 

75 

1817. BOXES, Aluminum, same as No. lsio, but with box and cover numbered. In ordering state 
what numbers are desired each 85 

1820. BOXES Aluminum, with aluminum top. The diameter of these boxes is uniform so that the 

coves fits the bottom of the box, making it possible to keep box and cover together while the 
box is open. 

No * B C 

2% 3Yj 

1-", 2 

.25 .40 .60 

1821. BOXES, Aluminum, same as No. 1820, but with box and cover numbered. In ordering state 



Diameter, inches " '•> 

Beight. inches 7 

Each 



what numbers are desired. 

J;? 1 

Diameter, inches . , . , o 

Height, inches 7 

Ea <* ::..::.:..::.::::::::::::::: jg 

BOXES, Glass, see Jars, Sample. 



B 


C 


2»/. 


3% 


1% 


2 


.50 


.70 



95 






BOXES 



CENTRAL SCIENTIFIC CO., rHlCA<iO, U. S. A 





No. 1826. 



No. 1828. 



1826 



1828 



B 

1 . 

.30 

3.60 



BOXES, Pasteboard, rectangular, slide form, white. ^ 

No "'' 'jr.,,. 

Length, inches 

Width, inches ' ' ' n "] 

Depth, inches '.'.'.'.'.'.'.'.'.'.'.... $0.26 

Per dozen 2 60 

Per gross 

BOXES, Slide. Bee Slide Boxes. 

BOXES, Soil Sample, Bee Soil Analysis Apparatus. 

BOXES, Seamless Tin. round, very convenieai Eoi Bamples. Widely osed ... asphall laboratories. 

PeHozen " 8 .:: :::::::: ::: i<> * m> .™ *> L* lto 

10'; discount in lots of 144. 



C 

UK 

38 
3.80 












14C4 
1834 



1836. 



IsJ'.S 



IS4II, 




No. 1464. 






— ■ No. 1840. 

No. 1834. 

VUUUii - 

No. 1836. No. 1838. 

BRUSHES 

BRUSH, Assay or Bead Brush, of bristle, fur lead buttons 1.00 

BRUSH, Beaker, Cylinder or Funnel, with wood handle and black bristles. Length of bristle 

part, 3 inches; diameter, 2 inches; total Length, 11% inches ,22 

10' ; discount in lots of 12. 
25'< discount in lots Of 144. 
BRUSHES, Bottle, bristle end, brass wire, white bristles. 

£° A B 

Total length, inches 12 20 

Length of brush part, inches ..*."/. **".*'.*'*.! ".! 4 5 1 • 

Diameter of brush part, inches %u _ ~ 

Each .!."!."! '/. V. '.'.'/.'..'. '.'.'.'/.'.]'.[ V. "20 "25 

10 r \ discount in lots of 12. 
25% discount in lots of 144. 
BRUSHES, Burette, tinned wire, white bristles No A B 

l°l i 1, 7« tt 7 <;< • ." .[[[['/.[..][[]'/. 10 & 25 50 & 100 

Total length, inches ., { 3 g 

Length of bristle part, inches... 3 314 

Diameter of bristle part, inches../ " ,". u 

BMh :::::::::::::::::::::;:: A » 

10', discount in lots of 12. 
2596 discount in lots of 144 

B * U kS,p?^. D "f D - g ' , W °° den hamUe ' ,ive rows - ^bleached bristles. Length of bristle part, 
8 inches; width. L"._. inches; total length, 13% inches 65 

10% discount in lots of 12. 

96 



1 "•'—'. t- ■ 



160 jj 



I fen 

16 

LSO 







ijikrt 



bn* 



.■•■ 



«ENTBAL_SCIENTlPic CO., CHICAGO, U. 8. A. 



BRUSHES 





No. 1850. 
No. 1872. 



6 O 

Nos. 1856-8. No. 1860 



No. 1866, 



ilJLP 






No. 1844. 



No. 1848. 



No. 1870, 




No. 1878. 




No. 1876. 



1844. 
1848. 

1850. 



BRUSH, Cylinder or Jar, with wooden hand] 



me, fi=s,7«r s^to^vm* " ris,,es - Leng " 1 ° f bris,ie p»*. « 






1856. 


ul 


1858. 


••■■■ . 




* 1 


1860. 




1866. 


A I 


1868. 


4 •'<■ 




I 




3) -1 


1870. 




1872. 




X 










1876. 


jf 





1 

BEUSHES M i lk 10 E«,t SC r n , ?.,' 0tS 0f „ 12 0D N0S - 1844 ' 1848 «« »50.' 24 

B EU s HE , « B„ t ^ j= ,, -^SS^ -— .ar- 

le H r E dJn nCU ' - "" ' S hair b ° uml in +aTl« "Lll *" d ° Zen 
# 2Q 

20% discount in lots of 144 
BRUSHES Pencil, of camel's hair, quill handles, silk bound 

Length of hair, mm 

Per dozen . . 



medium 
.40 



14 
1.45 



18 
1.65 



.09 
.90 
.09 
.90 
.15 
1.50 

large 

.50 



22 
2.50 



1878. 



KPTTcxT -D- * , 207r discount ^ lots of 144. 

uKUbH, Pipette, for use in cleaning volumetric, Mohr 's or milk pipettes i* 

RPTT _ utlc 10 " discount in lots of 12. 25% discount in lots of 144 

inrh SC3le Pan ' ° f Ca " ie, ' S hair ' W0 °' len haud,e> n,etal boun,L Len « th of hair - about 1 

Width of hair part, inches u ^ ■,^/ 

Each --' ' ' - 

20 .30 .40 

bpttott a 1 t. 10% disco^t ^ lots of 12. 

ivmTTnf? 1 Per , COlat ; on Tv : he > for leaning tubes used iu soil testing. Of unbleached bristles 
£*^ *—. 2 incne^ 

BRUSH, soil Sampling Tube, for cleaning tubes used in sampling 'soils'. ' Of 'stiff vegetable fiblr 
trfaUeZf mSS?" haDdlft LeDgth0f briSt,e Part " * % in ° heS; diameter, *1% inches; 



2 
.50 



.20 



97 






BRUSHES 



OEKTIUI- BOnWTIPIO CO., CH1CAQO, I T. 8. A 





6 






6 



6 



6 




Nos. T880-2. Nos. 1884-6. No. 1888. No. 1892. No. 1894 



No. 1896. 



No. 1902. 





1SS0, 
1884. 



No. 1890. 



BRUSH. Test Tube, bristle end, brass wire. Length of bristle pari over all, 4V 4 inches; ^""^J. 

1% inches: total length, l" :: , inches -• • •• • • • • • • •• ■•■ p Pr dn7en itf 

20' discount from the dozen price in lots of 144. per dozen .» 

BRUSH. Test Tube. van,,. :,s No. 1880 . but with tinned 7*?—"y- P^dozen 70 

20' . discount from the dozen price in lots of 144. Per dozen .70 

BRUSH Test Tube, sponge end, brass wire, for test tabes % inch or larger in diameter. Length 
tflristie part including sponge, 5% inches; diameter, 1% inches; total length 11 inche* 



20' , discount from the dozen price in lots of 144. 



issr, 

lsss 



Each .10 

Per dozen 1.00 

Each .07 

Per dozen .70 



BRUSH Test Tube, same as No. 1884, but with tinned *&*........ 

20' . discount from the dozen price in lots of 144. 

BRUSH. Test Tube, tinned wire. Length of bristle part, 3% inches; diameter, 1 inch j total 



Each .06 

Per dozen .60 



length. M inches Y '.' V ..'''.* i .7 

207, discount from the dozen price in lots of 14-L 

1890 BRUSHES Test Tube, Dolbey's (PaU'iit-di, with tuft of bristles bo constructed as to reach all 
parts of tube, yet affording the most perfect protection to the tub.- from breakage by the 
wire i'u<\ This is the besl tesl tube brush made and we heartily recommend it to laboratory 
workers who have been looking for something better than the old style brush with the con- 
stant annoyance fn.in breakage or imperfect cleansing. Length, 13'.j inches; for test tuhes 

% to :t i inch diameter 5 acn J "J* 

20'', discount from the dozen price in lots of 144. Per dozen .so 

1892 BRUSHES, Test Tube, Probangs, with rattan handle and sponge end. Length over all, 9 inches. 

Each .15 

20% discount from the dozen price in lots of 144. Per dozen 1.45 

1894. BRUSHES, Tube, for small tubes and funnel stems, of bristles on tinned wire. Length of bris- 

tle part, •_' inches; diameter, % inch; total length, 12% inches Per dozen .35 

20' , discount in lots of 144. 

1896. BRUSHES, Volumetric Flask, with floxiblo stool spring enabling the brush to reach every part 

of flask. No A B C 

For flasks-, capacity, cc 250 500 1000 

Each 38 .40 .45 

10' ; discount in lots of 12. 

BULBS, Absorption, see Absorption Bulbs; Potash Bulbs. 

1902. Bulbs, Leveling, of glass, for use in gas analysis. 

Capacity, cc 250 

Each . , 80 

BULBS, Nitrogen or Kjeldahl, see Nitrogen Apparatus. 
BULBS, Rubber, see Rubber Bulbs. 



son 

1.00 



98 



^r™ 










CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BURETTES 



1 





f 

No. 1908. No. 1912. No. 1914. No. 1916. No. 1918. No. 1920. No. 1928. 




No. 1930. 



BURETTES 



1908. BURETTES, for pim-h cock, without fittings. 
Capacity, cc 



Graduate. 1 in, cc 1 ,?* 

Each '.'.'.'.'.'.'... 

ATTACHMENT for No. 1908, sec Burette Accessories. 



25 

'10 
$0.55 



50 

1/10 

.70 



100 

1/5 

.90 



1912. BURETTES, with straight glass stop-cock. 
Capacity, cc 



Graduated in, cc i , >,» 

=«* ...:::::::::::::::::: l & 



25 
1/10 

1.35 



1914. BURETTES, with straight glass stop-cock and side tube for refilling 

< opacity, cc 6 .,- 

Graduated in, cc 1 ~'^ 



50 
1/10 
1.45 



Each 



1.80 
25 



100 
1/5 
2.25 

50 
1/10 
1.90 

50 
1/10 
2.65 

100 

1/5 

2.50 



1916. BURETTES, with three-way stop-cock. 

Capacity, cc 

Graduated in, cc , 

Eac » .....:..:.:::::::::::::::::::::::::: Y£ 

1918. BURETTES, with Freseniua stop-cock. 

( Opacity, cc , 5Q 

Graduated in. cc , , lft 

E « h .....:..:::::::::::::::::::::::: YS 

1920. BURETTES, rthft™, .top-*** and side tube witb gh™ *,„,,-,.,„., i„ «„,,, ,„ „ amng> 

Capacity, ce - 

Graduated in, cc ..] , 1( , ™> 

±jRCn 3.50 4.00 

1924. BURETTES, Schellbach, for pinch cock, with blue line on white background to facilitate read 
ing of miniscus; without fittings. 

X* 1 "^?'": 25 50 

Graduated in, cc 1/10 , ]„ 

Each 1.30 1.50 

1928. BURETTES, Schellbach, with straight glass stop-cock. 

Capacity, CC 25 50 

Graduated in, cc 1/10 j,^ 

Eacn .' 2.40 3.00 

1930. BURETTES, Schellbach, with three-way stop-cock. 

Capacity, ce 50 

Graduated in, cc 1/10 

Each 



100 
1/5 
3.00 

100 
1/5 
4.00 



4.00 



100 

1/5 

5.00 



Note.— 10% discount in lots of 12, 20% discount in lots of 72 from all prices on this page. 

99 



1 












BURETTES 



CENTRAL SClKSTinC CO., CHICAGO. U. 8. A. 







CCM 









COG 




A. B. C 

Nos. 1946 and 1947. 



No. 1951. 




No. 1952. 



8.50 

5.00 

.75 



No. 1932. No. 1934. 

193L-. BURETTES, ScheUbach, Automatic, with veto poinl and overflow rap. With thi 
cock, for refilling from reservoir. 

Capacity.,, » ' J« 

gS^ e i^f!;:;:;:;:::::::::::::::::::::::::::::: w-iS U i* 

10% discount in lots of 12. 
1934 BURETTES, Automatic, Squibb's. consisting of a s, l,, lll.u, }, t.im>tt« with Presenile stopcock 
in«. anted on reservoir, Complete with reservoir, clamp and su.ti.mi tube, but without pres- 
sure bulb. Capacity of burette, 50 cc, Qradnat.-l in l lo ,-,• .livisit.ns 

193.".. BURETTE only of No. 1934 

193fi. CLAMP oiilv of No. 1934 

PRESSURE BULB for No. 1934, Bee N to. 11530. 
194G BURETTES, Calibrating, Morse's, for flasks, burettes, and pipettes. Without stop-cock. 

No A B C 

Capacity of bulbs, cc 500 200 & 50 50, 3 A 2 

Ea ch ,, 8.00 8.00 8.00 

1947. STOP-COCK, three-way, for X«>. i '■• i' ; 3 -°° 

l!»48. BURETTE, Calibrating, Morse's, graduated from L.5 to 2.5 cc, with three-way stop-cock, for 
small quantities 600 

1951. BURETTES, Dispensing, with straight glass mi.j. -■•<.. k. 

Capacity, cc 250 500 1000 

Graduated in, cc -' 1° 

Each 2.80 3.90 5.00 

10' ; discount in lots of 12. 

1952. BURETTE. Weighing, Ripper's, arranged for suspending from balance hook by aluminum wire. 

Graduated to i5" cc in 5 cc divisions 3.50 

BURETTES, PRECISION 

The precision burettes listed here are the product of manufacturing establishments with whose 
methods of calibration and standardization we are thoroughly familiar. We believe those without 
certificate to be as reliable as any obtainable. We strongly recommend, however, thai every analyt- 
ical laboratory purchase at least one burette which lias been tested by the Bureau of Standards by 
which to check their uncertified standards. 

1958. BURETTES, Precision or Normal, for pinchcock, graduated to meet the requirements of the 
United States Bureau of Standards. Without fittings. 

Capacity, cc ;,n 100 

Graduated in, cc ] in 1/5 

Each 5.50 6.50 

1960. BURETTES, Precision or Normal, with straight glass stop-cock with curve.) tip- Graduated to 
meet the requirements of the United States Bureau of Standards. 

Capacity, ec gg jjg 100 

Graduated in, cc - ] ], ( \ |n 1 5 

Each 4.00 5.00 6-0° 

1962. BURETTES, Standard, with straight glass stop-cock with curved tip, tested by the Unite! 
States Bureau of Standards. "With control stamp and certificate of corrections. 

Capacity, cc 2o 50 1lHI 

Graduated in, cc ' I/IQ L/10 l "' 

Ea <* ../."/•""."////."/. 9.00 10.00 H°° 



100 



— ^ 



H 



.■^ 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



BURNERS 






No. 1968. 



No. 1970. 




No. 1976. 





No. 1982. 



No. 1984. 







N o. 19 90. Nol992 . Nol998 No2ooo 

BURETTE ACCESSORIES 

1971. GLASS TIPS only for Nos. 196870 60 

1976. BURETTE CAPS, ,„ protect inside of burettes from dust. "" d °" n ^ 

For burettes, cc , . . B C 

Each . ..""!!!] 5n 10 ° 

Per dozen. ... ' " 08 10 

Z B^ETTE ^^TT T POin ' tV '• ^ adhV — - * * * * « « 
982. BURETTE FUNNEL, 1 lnc h .„ diameter, for use in ailing burettes. . . « 

^ T^ E ^^!bfe E e™e C ° nSiStiDg "' * ""***- "~ -^f"»"'^ '- £ 

r 3.00 

BURNERS FOR GASEOUS FUELS 

Acetylene. 

199,, BURNER, Bunsen, for acoty.ene g 0s . Height of burner, 5« i„,,,e, ; diameter of tube, fc 

2.50 

Coal Gas. 

1W " B Yk N i ER ', BUn f 5 with / ir regulator and slot-shaped nipple which can easily be adjusted to suit 

10% discount in lots of 12, 25% discount in lots of 144 

1994. Burner, Bunsen, similar to No. 1992 but larger in size. Height, 5% inches; diameter of tube, 

,... go 

10% discount in lots of 12. 

1998. BURNER Bunsen same as No. 1992, without base, and with stop-cock, for screwing into gas 
L inch ? constructin S digestloB shelves, etc. Total length, 6 inches f dimeter! 

10 % discount in lots of 12, 25% discount in lots of 144. 

°°" B ^ EK - Bunsen, with stop-cock and pilot flame. Height, 6 inches; diameter of tube, % 

•••••••••........,.. •••---•.........,»«. i fin 

10% discount in lots of 12. 

101 






BURNERS 



NT1 . A1 . scientific ('a L n n<;A«'»- v. *■ a. 










No. 2004. 



No. 2010. 






No. 2013. 





No. 2044. 



2004. 



2008. 

2010. 

2013. 



2013 A 
2020. 



2*2". 

2025. 
2028. 



No. 2028. ■•■«» No. 2034 

BURNERS Bunsen, Central Draft, an excellent burner for elementarj student use. Substanc 
accidentally dropped ... tube will fall through without i lagging gas Inlet. Height, 5% .inches; 

diameter of tube, % 6 inch. With air regulator eacn *<>•« 

10' , discount in lots of 12. 25 discount in lots of 144. 

BURNER, Bunsen, low form, with air regulator. Length, 5% inches; height, 3 Laches; diameter 

of tube, "i,; inch •••• • • ■ • ••;•••: 

10'; discount in lots of 12. 

BURNER Bunsen, micro form, nickel-plated, 2 inches high, tube \A inch in diameter 70 

10'; discount in lots of 12. 25' [ discount in lots of 144. 

BURNER Bunsen, Self -Lighting. Especially convenient for the lecture table and for analytical 
laboratories A pressure of the finger on the right has ft button turns on the gas and Ughts it; 
the other button turns off the gas. thus avoiding the necessity of turning it <.ff at the Btop- 
,.,„.|. *- w 

SPARK RENEWALS for No. 2013 eacl \ ,-JJ 

per dozen 1.00 

BURNER, Argand, adjustable flame, with B inch mica chimney. Especially desirable "here um- 

Conn temperature is essential. Total height, including chimnej , 1 1 inches lfe0 

10 r ; discount in lots of 12. 

CHIMNEY for Argand Burners, of glass. Height, 7 inches; diameter, 2 inches each .20 

per dozen 1-90 

CHIMNEY for Argand Burners, of mica. Height. 8 inches; diameter, - inches 

BURNER, Chaddock's, made of porcelain and white lire elay, incorrodi 




2029. 

2034A 



support, 4 inches ' 

DISH SUPPORT, or Castle Top, for No. 2023 55 

.BURNERS, Koch Safety, with automatic valve to shut off gas when dame is extinguished, valve 
is operated by Bpring controlled by expansion and contraction of metallic spirals. Especialij 
desirable in heating incubators or other apparatus where flame must be kept in operation 
over long periods of time. With threaded inlet for attaching metallic tubing, llei^in. - 

inches; diameter of tube, > r >,, ; inch ' 

BURNERS, Meker. a very powerful burner designed on scientific principles which eliminate 



2044. 
204.1. 



entirely the cold Bunsen cone and gives a name that is practically a homogeneous ass of 
burning gas with a temperature that is nearly uniform throughout. Nos. 1 and - are 
used instead of the Bunsen Burner; No. 3, the general laboratory type; Nos. i and ->, to re- 
place the blast lamp. No 1 2 3 4 

Height of burner, nun n:, ISO 155 15'° 

Diameter of flame, mm 16 20 25 30 

Tor artificial gas 2.00 2.20 2.60 3.20 

Tor natural or gasoline gas 2.00 2.20 2.60 3.20 

102 



5 

250 
43 

6.50 
6.50 












jl\] 



KtfnM^ 



('EN 



BURNERS 






.. eadif 

i 

' 

If it & » 
. 

Kl - 

!rdoa tf 
ible *- 

..ad J 

« ta asS 

- 

4 

JO „ 

- 

3i0 * 




No. 2066. 



No. 2098C. 




No. 2070A. 





No. 2094A. No> 2094C 

2066. BURNERS, Bunsen (Simple Combustion Furnace). Consis a oi four No. 1998 humors with stop- 
COCkS, a.r relators ami w „,£ tups, mounted .... .-, gas supply tulu- with ad justable forks for 
holding combustion tul.es. Without glass tube it $13 00 

2070A. BURNER, Fletcher's Evaporating, made of solid copper with lap joint's' ' An exMUent bnnai 
for heating flasks or beakers, as it is free from ml, I spots or cold air currents, nor docs the 
direct name come m contact with the glass. Diameter, 4 inches; height, about l 1 • in 3 50 

2078. BURNERS, Fletcher's Radial, of cast iron, easilv .-leaned. 

No V Q 

Diameter of ring, inches 3_y - 

Diameter of stand, inches ....*......!.'.. i;i.', s 

Gas consumption per hour, eu. ft lif is 

Eacn 2.50 3.25 

2082. BURNER, Fletcher's Solid Flame, for quick heating of large surfaces. Diameter of flame sur- 
face, 4'i inches; gas consumption per hour. 35 feet 2 50 

L'lis:,. PERFORATED CAPS, Copper, for No. 2082 "..'.'.'. each '.60 

-iiss. BURNER, Gas Stove, round portable, with east iron top and base, and Russia iron body. Steel 
drip pan is beneath 1. inner and lop is raised. Total height, -Hi inches; diameter. 9 inches. 

1.80 

2094. BURNERS, Gas Stove, with radial burners. Finished in black japan and nickel-plate. For 
coal gas unless otherwise specified. 

No A H C 

Number of burners 1 2 3 

Size of top plate, inches 12x12 12x22 12x32 

, Each 5.00 7.30 11.50 

LOliv. BURNERS, Glass Blowers" Fires, on base with four legs for attachment to table top, with gas 
and air inlet tubes vertical. Set consists of two parts with three burners each as illustrated. 

14.00 

-W99. BURNER TIP for glass blowers' tires, concave 80 

103 









■ 



BURNERS 



CENTRAL annsNTIHC 00., CHI0AQ0, U. 8. A 






No. F6681. 



No. 2108, 



No. 2104. 




No. 2114. 




JTja 






No. 2110. No. 2122. No. 2126. No. 2132. No. 2112. 

2104. BURNER. Illuminating, for table illumination, glass bending, etc Height, 12 inches S1.35 

10 f ; discount in lots of 12. 

F6681. BURNER, Illuminating, low form, with aluminum gas tip. 60 

2108. BURNER. Low Form, extra large, with gauze top. Height, S inches; diameter, -'>, inches; ex- 
treme length, 14 inches. A valuable burner t'nr use in heating sterili/. ml incubators 3.00 

2110. BURNERS. Ring Form, with air regulator, to be attached to Bupport by means of a right angle 
clamp, such as No. 2914. 

No A B D 

Diameter, inches 3 4 6 

Each 1.90 2.00 250 

2112. BURNER, Roger's Ring, for heating platinum crucibles without bumping while evaporating 
strong solutions. Flan,.' is applied to upper part of crucible only. Complete with platinum 

triangle of No. 2<i VI ire " 10.00 

2114. BURNER, Soldering Iron Heater, simple construction, cast iron ba«.-, with Russia iron hood. 
Total height, 6»o inches; extreme length, 14 inches 2,00 

Burners, Adjustable, for Use With Coal, Gasoline or 

Natural Gas. 

2122. BURNER, Bunsen, adjustable, without base, for screwing directly into gas pipes. Useful in 
making up n.ws of burners for KjeMahl digesting shelves, etc. "Length, «i', inches: diameter 

oi tube, % inch 110 

2126. BURNER Boyce's Adjustable, with improved regulator for air and gns. The best low priced 
burner for coal gaso me, or natural gas, as the tube is Stationary, permitting all burner attach- 
ments to be used w,th it to the best advantage. Very satisfactory^ for use with Blau gas .75 

2132. BURNER Tirrill Type, substantially constructed, with regulators for air and gas. Considered 

Vnf t»i.P - V S v e for - U f w ' ,h ,na1 ' naturaI ,,r i^uw gas. Height, 6 inches; diam- 
eter Of tube, ' ,« inch. Very satisfactory for use with Blau -as . . 1.40 

10% discount in lots of 12, 25% discount in lots of" 144." 

104 







BUB. 




th. 




air 




-•- 


_ TT 


BUB. 



•>'I BUI 




Th 




<■; 




ula 


2UL 


BUR 




Bfc 




be 




S*« 


-•. 


BUB. 




air 




ib. 




BUB. 




lHr 




m f 




ms 




h 


•>!•. 




■ 


BUB. 




" 




be 






■w^r^^E? 



■V*-** -»>' _ 



xs-- 



-r. 



CENTBAL SCIENTIFIC CO, CHICAGO, U. S. A. 



EURNERS 




to aii 

.... u 
I 



. 

J 
I 

N 



M :• '- lj 

' 



■ ■ • ■ 



inrbr? 






• ••' 



• • 





No. 2142. 



No. 2144. 




No. 2150. 






,'142. 



J 144. 



2146D. 



2150. 



2152, 



2 1 .54. 



2155. 



No. 2152. No. 2154. No. 2155. 

Burners, High Temperature. 

BURNER, High Temperature, Fisher's, a burner of the Mcker type, but so designed as to secure 
the greatest economy in production by the use of automatic machine processes. A perforata! 
nickel eap is furnished for producing a Mcker type of flame and a brass cap with hole for the 
usual Buuseu flame. Height, 7 inches; diameter of flame, 1% inches $1.75 

BURNERS, High Temperature, of Mcker type with adjustment for air and gas. Constructed 
of brass with grid top. 

No. 3 4 

Height of burner, inches 6% 7^ 

Diameter of flame, mm 25 80 

Each 3.00 3.50 

BURNERS, Braun's Vulcan Non-Blast, for coal or natural gas, for use with Braun Furnaces. 
These are non-blast burners operating without noise and upon regular gas pressure. Each tube 
consumes about 50 cubic feet of gas per hour. Complete with four burners with separate reg- 
ulating valve for each burner ■•••••■•« 16.00 

Burners, Blast. 

BURNER, Blast, Braun Gas, for use with artificial or natural gas. Designed for use with Fur- 
nace No. 6398. Requires a blower to furnish sufficient amount of air. (See Nob. 1406-8.) Should 
be connected to a %-ineh gas supply line. Shipping weight, 18 pounds. Complete with air and 
gas valves 16.00 

BURNER, Blast, Bunsen's, with three interchangeable gas tips and with stop-cocks on gas and 
air inlet tube. An excellent lamp for ordinary laboratory use. Height with tube horizontal, 
about 4*£ inches. Should be used with Foot Blowers Nos. 1374-6. For coal gas only. 4.00 

BURNER, Blast, Bunsen's, extra large size, on adjustable stand, with two tips. Length, 8% 
inches; height with tube horizontal, 6VL> inches, adjustable to 8 inches; diameter of body, 1% 
inches; gas and air nipples to take % inch rubber tubing. Requires blower capable of fur- 
nishing a flow of air under a pressure of 4 to 16 pounds, depending upon which tip is used. 
For coal gas only 10.00 

BURNER, Blast, similar in construction to Bunsen's but with needle valves instead of stop- 
cocks. Mounted on ball and socket joint, with set of three gas tips and two sleeves. Can 
be used with coal, gasoline or natural gas 6.25 

105 





















BURNERS 



CENTRAL SCIENTIFIC «"• < HI CAGO, U. 8. A. 




No. 2156. 




No. 2182. 




No. 2160. 





No. 2186A. 



No. 2192 



No. 2191 



BURNERS FOR LIQUID FUELS 

Burners, Alcohol 

2156. BURNER, Blast, Fletcher's Compound, with range from a delicate pointed jet to a laige brush 
flame; mounted on adjustable heavy easl base. Flame easily controlled by lever which adjusts 
both air and gas automatically. Especially valuable in glass working. For coal gas only. 



2iuu. 



2170. 



2172, 

217: 

2174 
217.5, 



12.50 

BURNERS. Blast. Meker Type, with shorl inlel tube foi air. Height of burner, 135 mm; diam- 
eter of flame, 20 nun. For coal gas only 4-80 

BURNERS. Blast, Brazing, B ee Blowpipe No. 1414. 

BURNERS, Alcohol Lamps, of glass, with ground cap, wick and wick holder. 

Capacity, ounces 4 8 

Each S0.35 .40 

BURNERS, Alcohol Lamps, of brass, with sen w ap, wick and wick holder. Capai ity 4 ounces. 

. . 90 

.10 
.40 



217s 



2179. 
21*2. 



2186A, 
2192. 

2194, 



Burner Wicks, for alcohol burners Nos. 2170 and 2172 per dozen 

Burner Wick Holders, brass, for No. 2170 per dozen 

Burner Caps, of glass, for No. 2170. 

No A 

For burner, ounces 4 

Per dozen ,80 

BURNER, Alcohol Lamp, of glass with nine facets <>n the font, enabling it tr. be placed in an; 

position. Provided with wick V& inch in. diameter, giving a much hotter flame than ordinal] 

alcohol lamps 

Burner Wicks for No. 2178 ! .7. .,*.,'. .,"..". . per dozen 

Flame is 
and reservoir of 



B 

8 
.80 

any 

nary 

.90 

.80 



BURNER. Barthel's Automatic, for alcohol; requires no wick; very powerful. Flame is equiv- 
alent to 2 Bunsen burners. Complete with 1% meters flexible steel tubing 



1 liter capacity. 
BURNER 



iter -capacity. Height, 182 mm; diameter of flame, IS nun 9°° 

NER, Barthel's Alcohol Stove, enameled finish with brass reservoir; nr wick required. Safe, 

B^oit 81 ^ ? f flame "' ; " lilv adjusted. Capacity of reservoir, »., liter fi .oo 

burner Alcohol stove, of brass, ni.kei plated, with invisible, indestructible wick. Very power- 

„ f iX ,1 "';"^ ?o smoke " r odor. Wei-ht, 8 ounces; capacity, 7 ounces I- 00 

burner. Alcohol Stove, as used on Moisture Testers; noiseless, economical and safe. Burn- 
with intensely hot, blue, smokeless flame for three hours on one charge. The best alcohol 
stove substitute for a broad gas flame; Flame adjustable in height 4- 00 



lm; 






WH 




CENTRAL SCIENTIFIC CO., CHICAGO, U. B. A 



BURNERS 




194. 






J 

•m * 

i 
i 

in*** 
I 



Irs*"* 



i 





No. 2211A. 



No. 2200. 




No. 2206. 




K»itf? 





No. 2208. 



No. 2218. 



No. 2222. 



2200. 



2200. 



• ■ 



• • 



Burners, Gasoline and Kerosene. 

BURNER, Baby Gasoline Torch, of brass, nickel plated. Pits the hand and ean be used in any 
position. Automatic in action, without valves or pump. Burns two hours with one filling. 

Capacity of reservoir, *4 pint. Height over all, 7% inches $1.90 

10% discount in lots of 12. 

22016. Wick and Strip, only of No. 2200 for replacement 15 

Other repair parts can be supplied if desired and prices will be quoted upon request. 

BURNER, Cenco Laboratory Blast Lamp, for gasoline. The tank is of heavy seamless drawn 
brass, with brass pump in handle; the burner is of special bronze alloy. The flame is intensely 
hut, and can be regulated from small point to large brush. An excellent substitute for the 
Bunscn burner or gas blast lainp. Capacity of adjustable tank, 1 pint; total height of burner, 
7 inches 7.25 

BURNER, Cenco Adjustable Laboratory Blast Lamp, for gasoline. Similar in construction to No. 
2206, but mounted on swivel stand so that flame ean be pointed in any direetion, and raised or 
lowered. The pump is of brass mounted inside the tank and is automatic in action. Complete 
with adjustable tripod, which can be swung out of the way when not in use 10.75 

2211A. Burner Body, Needle and Drip Cup, for either No. 2206 or No. 2208, for replacement 5.00 

Other repair parts can be supplied if desired and prices will be quoted upon request. 

BURNER, Dangler's Gasoline Blast Lamp, flame easily adjustable. With tin reservoir, holding 
»j gallon. Complete with rubber pressure bulb. Height of burner, 10% inches; height to top 
of support rod, 17 inches; diameter of reservoir, 7 inches 14.50 

BULBS, Rubber, for No. 2218, see No. 11530. 

BURNER, Kerosene Stove, wicklcss, giving hot, blue flame, without smoke or odor. Height, 
&% inches; diameter of base, 9 inches. With removable tripod 7.00 

107 



2208. 



2218. 



2222. 









BURNERS 




. ENTK 



,\L BGIBNT1FIC <<>., CHICAGO, IT. 8. A. 



1 





No. 2226. 



NO. 2228. 



No. 2230 



No. 2232. 




No. 2234A. 




ft 

No. 2236. 



No. 2246. 





No. 2238. 



No. 2240. 








No. 2250A 



No. 2252. 



No. 2242, 



2226. 



2228. 

223". 
9099 

2234 A 
2236. 

2238. 
2240. 

2242. 



BURNER ACCESSORIES 

BURNER BLOWPIPE ATTACHMENT, to lit Oil B : ,„ inch I urner tube. Takes the place of both 
blowpipe ;iii<l blowpipe tip, leaving both hands free, should !>•• u <. ■ -I with rubber tube and 

glass mouthpiece $1.10 

10% discount in lots of 12. 

BURNER BLOWPIPE TIP, with rest, for blowpipe, fitting outside ' u - in. h burners 

BURNER BLOWPIPE TUBE, for yellow flame, fitting insi.k •„; ineh l.urners 



.15 
.20 



BURNER CHIMNEY, of Russia iron, to protect flam.- from drafts, for iim- with N"<>. 2246 Star 
Support. Diameter at bottom, 2 inches; :»t top, 1% inches; height, 2 inches -12 



BURNER CHIMNEY, of Russia iron, with attached Support, for 7 „. in, h I. win. 



.80 



224 fi. 
2248. 



BURNER CROWN TOP, giving round flame, for beating dishes; diameter, 1 inch; for 7 1) . inch 

burner 50 

BURNER FORK for attaching burner to ring stand .30 

BURNER GAUZE TOP, giving large round flame; diameter, 1 ' ■_• inches; for 7,,. in. burners .30 

burner GUARD, of vitrified earthenware for protecting a flame from drafts. Will also be found 
a rigid and convenient support, measuring !» inches high, 8 inches diameter at base, 5 inches 

diameter at top. Provide. I with hole for rubber tubing and inlets for air to SUDDOrl coinhus 
tion .70 

BURNER STAR for supporting No. 2232 Chimney, for %« Inch l.urners .25 

BURNER SUPPORTS, of iron, with heavy screw for clamping on supports or tripods. 



N" 



B 

5 

.50 



l>iameter. inches >i 

Each :; ;;;;;; :;;;;;;;;;;;;;;;;;;; ;;;;;;;;;:: Jl 

10% discount in iots of 12. 

2250A. BURNER TRIPOD for holding dishes, measuring 2% inches between supporting points, for ' U ; 
inch burners " ^2. 



2252. 



BURNER TUBING, see Rubber Tubing. 

BURNER WING TOPS for use in bending glass tubing. 

N° \ 

For I. inner tube, diameter, inches 7/ 



Each 



10% discount in lots of 12, 25% discount in lots of 144. 

108 



.10 



B 
.16 









ii M^T^rrT r 



JV^V*T* 



I I 

r i 

■ 



,^-Y- 



a§*3?s*s 



- --•. 



■ - -, 



$ 



CENTRAL SCIENTIFIC CO., CHICAGO. U. 8. A. CALCIUM CHLORIDE 





No. 2304. 




3 



ii 



No. 2306. 




1 



^ 



No. 2310. 



=nn=c= 



No. 2312. 



No. 2314. 



Iff" 






„ 



No. 2300. 



No. 2302. 




No. 2316. 



No. 2318. 



No. 2320. 



CALCIUM CHLORIDE TUBES 



2300. 



2302. 



pin if ty 


2304. 




2306. 


• 


2310. 




2312. 


J 




Jso be t'«oi H 




2314. 


* H 


2316. 


1 


2318. 


• 




«tU*;> H 


2320. 







CALCIUM CHLORIDE JARS, Drying Towers, on foot, with tubulature near bottom 

Height, inches g 1() 19 

Eacn $1.10 1.20 1.40 

CALCIUM CHLORIDE JARS, similar to No. 2300, but with perforated ground glass stopper and 
side tube near top. 

Height, inches jq 

Eacn .......;.*; 3.10 

CALCIUM CHLORIDE TUBES, one bulb, straight delivery tube. 

Length to bottom of bulb, Inches 4 

Diameter of tube, inches % 

Each .10 



12 
3.70 



6 

% 

.12 



8 

% 
.16 



CALCIUM CHLORIDE TUBES, trwo bulbs, .straight delivery tube. 



Length to bottom of first bulb, inches 
Diameter of tube, inches 
Each 



CALCIUM CHLORIDE TUBES, U shape, plain. 

Length, inches 

Diameter of tube, inches 

Each 



CALCIUM CHLORIDE TUBES, U shape, with side tubes. 

Length, inches 

Diameter of tube, inches 

Each 



4 

% 

.15 

4 

•"■s 
.16 

4 

% 
.30 



6 

% 
.20 

6 

■;* 

.20 

6 

% 

.32 



.25 



:; . 



CALCIUM CHLORIDE TUBES, U shape, with side tubes and bulb on one. 

Length, inches 

Diameter of tuoe, inches 

Each , , . 



4 
.25 



8 

% 
.26 

8 

% 
.40 

6 

% 

.35 

CALCIUM CHLORIDE TUBE, Marchand's, with cork and connecting tube. Length, 6 inches; 
diameter, % in<n 50 

CALCIUM CHLORIDE TUBES, Peligofs, U shaped, with three bulbs. 

Length, inches 

Diameter of tube, inches 

Each 

CALCIUM CHLORIDE TUBES, Schwartz, with side tubes and perforated ground iu glass stoppers. 

No A B 

Length, inches 4 6 

Diameter of tube, inches \ % 

Each 90 1.20 

10% discount in lots of 12. 

CALIBRATING BURETTES, B©e Burettes. 

CALIBRATING PIPETTES, see Pipettes. 

Note.— 10% discount in lots of 12, 25% discount in lots of 144, on Nos. 2304 to 2318 inclusive. 



4 


6 


•s 


■\s 


.40 


.50 



100 






CALIPERS 



OENTBAL SCIENTIFIC CO., CHICAGO. U. 8. A 













No. 2328. 






No. 2332. 



No. 2238. 



No. 2340. 



No. 2342. 



No. 2348. 





^"- " '■ ! BiH JMe i 



No. 2354. 



No. 2356. 



2328. CALIPER. Inside. Polished steel. Length, 15 cm $0.35 

2330. CALIPER. Outside. Polished steel. Length 1 ■", em .35 

2332. CALIPER. Double. Inside and outside. Polished steel. Length, 15 em .50 

2338. CALIPER. Spring. Inside. Even tension, solid nut Polished steel. Length, 12.:. , ,,, 1.20 

2340. CALIPER, Spring. Outside. Even tension, solid not. Polished steel Length, 12.5 cm... 1.20 

2342. CALIPER, Micrometer, Metric. This caliper will measure all sizes up to 25 mm, and is gradu 
ated to read to 0.01 mm. It is provided with a friction In ad bo that all measurements are made 
\\ ith th< Bame degree of pressure 6-00 

2344. CALIPER. Micrometer. Metric, for measurements up to 25 mm, graduated to read to 0.01 mm. 
Provide. 1 with a ratchet stop, same as No. 2348 8.00 

2348. CALIPER. Micrometer. English, for measurements up to 1 inch, graduated to read to 0.001 in. 
Provided with ratchet stop 8.00 

2352. CASE for Micrometer Caliper, covered with morocco leather and lined with velvet. Will hold 
either No. 2.144 or No. 2348 1.00 

2354. CALIPER, Vernier, of steel; length, over 16 cm; the most complete vernier caliper on the mar- 
ket inside caliper, outside caliper and d.-pth gauge combined. Graduated to ;. inches in 16th 

inch divisions and to 12 centimeters in millimeter divisions; reading by verniers to 1 128 inch 

ana i/w millimeter. Thumb attachment for easy operation. Neat, accurate and durable 2.50 

2356. CALIPER. Vernier, of steel, same as No. 2354 with the addition of a micrometer screw adjustment. 

3.00 

2357. CASE for Vernier Caliper, leather. Win hold either No. 2354 or No. 2356 -60 

110 



m 


CAI 




T 




» 








1 




: 




a 




u 




« 




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D 








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n 




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b 




i 


ML 


Eft 


:k. Eft 


1153: : 


E.Th 


* 


Ri« 






" 




In 


-•• 


£:: 


:*■••. to 


■ • 


Ba 


■ • 


Sod 


. -. 


A. 


■ 


Gli 




su 






«IM 






FnOi riy< ^5a: 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



CALORIMETERS 




<£-* 





No. 2o60. 



No. 2376. 





No. 2378. 



No. 2380. 



2360. 



CALORIMETERS 

(For complete description of the Parr line send for Bulletin No. 73.) 
CALORIMETER, Parr Standard, for determining the heat units in coal, coke, lignite and oils 
Thr most rapid and convenient apparatus for measuring tin- calorific power of fuels. Requires 
no special skill in manipulation and no complicated connections to oxygon tanks, etc. Outfit 
is readily portable, being self-contained. Requires power to operate st'irrer, which can be fur- 
nished by electric motor. Determinations can be quickly made, requiring not more than 
20 minutes to complete a test on a prepared sample Tlo- bomb <>r combustion cup fur- 
nished is made of a special alloy which resists the action of the melted sodium peroxide, 
and can be used continuously. An arrangement is made whereby the water is not admitted to' 
contact with the bomb until the fusion is completed, thus insuring the complete combustion of 
the sample. A further advantage of this calorimeter is the fact that sulphur and total carbon 
may be easily determined from the fused product of the combustion by the Sulphur Photometer 
(see No. 2378), and the Total Carbon Apparatus (see No. 2876). Two interchangeable fusion 
cups are furnished enabling duplicate determinations to be mad*'. Complete with thermometer 
reading from 65° to 90°F. in V 20 ° divisions with Bureau of Standards certificate, reading lens 
with support, two liter measuring flask, chemical receptacle, measuring cup, 100-mesh 5 inch 
brass sieve with bottom, forceps, camel hair brush, ignition wire and chemicals sufficient for 

fifty determinations, but without motor $90.00 

Accessories and Parts for Parr Standard Calorimeter 

2361. Electric Motor, variable speed, for 110 volts A. C. or D. C. mounted on support 27.00 

2362. Electric Motor, variable speed, for 1220 volts A. C. or D. C. mounted on support 27.00 

13533A. Thermometer, 65° to 90° P., in V, n ° divisions, with Bureau of Standards certificate..., 12.00 

13533B. Thermometer, 65° to 105° F., in K it ° divisions, with Bureau of Standards certificate 15.00 

4967G. Rheostat, Cenco, for 110 volt circuit, for use with lighting circuit to reduce voltage to safe limit 

for ignition. Resistance, 44 ohms; current, 3.1 amperes , , 6.00 

4!»«w l\ Rheostat, Cenco, for 220 volt circuit. Resistance, 89 ohms; current, 2.2 amperes 6.00 

2367. Ignition Wire for electric ignition per card .60 

2368. Bomb for Electric Ignition, complete with wrenches 35.00 

13730. Reading Lens, with support 2.25 

2370. Benzoic Acid, for standardizing per 2 ounce bottle 1.50 

Sodium Peroxide, a special quality put up for use with the Parr Calorimeter, in metal container. 

Size, pounds ■ • % % 1 

Each 75 1.25 2.00 

Accelerator Per 2 ounce bottle .55 

Gaskets for bomb P €r dozen .40 

SULPHUR BOMBS, Parr, for sulphur determination in coal, coke or oils made independently 

of the ealorimetric process, see under general heading Sulphur Determination Apparatus, 
TOTAL CARBON APPARATUS, Parr, for total carbon in coal, coke, etc., in connection with the 
Parr Standard Calorimeter. Bv adding acid to the dissolved residue from the combustion, 
which appears as sodium carbonate, carbon dioxide is liberated and measured under proper 
conditions. ( 'omrdete with full directions for use 52.00 

2378. SULPHUR PHOTOMETER, Parr, for determining the pen.ntage of sulphur in coal, coke and 

petroleum For description see under general heading Sulphur Determination Apparatus 30,00 

2379. Barium Oxalate for use with No. 2378 P« 2 ounce bottle .75 

2380. SULPHUR PHOTOMETER, Parr, simplified form. For description see under general heading 



2371. 



2372. 

2373. 



2376. 



Sulphur Determination Apparatus 



22.00 



111 



CALORIMETERS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 











No. 2382. 






2382. CALORIMETER, Parr Oxygen Bomb, a now instrument of the Borthclot-Mahlor type with a 
bomb made of the new acid-resisting alloy Illiuin. This metal has proved by means of tests 
extending; over several years to be equivalent to or better than platinum for ealorimctric work. 
This feature renders unnecessary any costly lining of gold or platinum, and consequently makes 
the Parr outfit the most economical of the bomb calorimeters recognized as standard. The new 
bomb is also entirely free from the corrosion to which the platinum-lined steel bombs are sub- 
ject, and eliminates the annoyance due to the chipping and cracking of the enamel in porcelain 
lined bombs. A rubber gasket is substituted for the lead of tin- old type, and B check valve 
with rubber seat replaces the needle valve. The calorimeter can ifl oval in shape permitting 
the use of a rotary stirrer which quickly distributes the heat and obviates any temperature lag. 
Complete with Illiuin bomb, water container, insulating vessel of indurated fibre with cover of 
same, rotary stirrer, pressure gage and needle valve with oxygen connection and couplings, 
octagon socket for bomb, spanner wrench, six capsules of special alloy, reading lens and sup- 
port, special ignition wire and gaskets, but without thermometer or motor* (See Report of the 
Joint Committee of the American Chemicnl Society and American Society for Testing Ma- 
terials, in the Journal of Industrial and Enzineerino- Oicmistrv, Vol. IX, No. 1, for January 
1917) * -.; ; $300.00 

Accessories and Parts for Parr Oxygen Bomb Calorimeter. 

2361. Electric Motor, variable speed, for 110 volts A. C. or D. C 27.00 

2362. Electric Motor, variable speed, for 220 volts A. C. or D. C 27.00 

13533A. Thermometer, 65° to 90° F., in i,, t divisions, with Bureau of Standards certificate 12.00 

13533B. Thermometer, 65= to 105° F., in i, n divisions, with Bureau of Standards certificate 15.00 

13519. Thermometer, Beckmann Differential, with range of 5 to 6 degrees graduated to Mrf 0, with 
Bureau of Standards certificate ™ 30.00 

2384. Bomb only of Illium alloy 225.00 

2384A. Gaskets only for No. 2384 Bomb per dozcn 1.00 

2387. Pressure Gage, with needle valve, oxygen connections and couplings 26.00 

13730. Reading Lens, with support 2.25 

2367. Ignition Wire ][[[[ [[[[[[[ [[[ per card '.60 

2390. Gaskets for Valve per dozen .90 

2391. Gaskets for Union per dozen .50 

2392. Capsules, of Illium alloy h 375 

112 









CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



CAIiORIMETEES 




No. 6G49. 





No. 2394. 



alonaetmwt 

-1 btslund 

nd i eked 
shape pemitta| 

trfflprtltwllf 

I yd EMpfaff 
i. 1, for Ju»? 

01 

■■■•. 

firtt* 

• 
. 

* 'a* 

::! 

■ 



2394. 



2361. 
2362. 



!40O. 



6549. 



CALORIMETER, Parr Adiabatic Oxygen Bomb. An entirely new adiabatic system is employed 
which insures a degree of accuracy not possible with pneumatic or vacuum methods. Water is 
kept circulating constantly throughout the cover and on all sides of the jacket, the tempera- 
ture of which is under the positive < ntrol of the operator. By turning the proper valve, 
either cooler or warmer water is instantly admitted and immediately distributed throughout 
the jacket permitting the operator to keep the temperature controlled in either direction to 
correspond absolutely with that in the calorimeter proper. This is a feature not found in any 
other commercial calorimeter. By this means errors due to radiation or to conductivity lag are 
eliminated and the use of calculations made unnecessary. The cover is pivoted so that it 
swings out of the way in a horizontal plane, carrying the thermometer with it, thus reducing 
the danger of breakage to a minimum. The water container and bomb are the same as those 
employed in the Oxygen Bomb Calorimeter No. 2382. Complete with water container, Illium 
bomb," adiabatic water jacket, rotary stirrers, pressure gage and needle valve with oxygen con- 
nection and couplings, octagon socket for bomb, spanner wrench, six capsules of special alloy, 
reading lens and support, special ignition wire and gaskets, but without thermometer, motor, 
heater, or heater burner • $400.00 

Electric Motor, variable speed, for 1 10 volts A. C. or D. C 27.00 

Electric Motor, variable speed, for 220 volts A, C. or D. C 27.00 

Note.— A gas burner and hot water heater can be supplied for use with No. 2394 if desired. Prices 

will be quoted on application. 
For other parts, see those listed under Parr Oxygen Bomb Calorimeter No. 2382. 
Note:— If desired bv those who are accustomed to using only platinum lined bombs, we shall be 

glad to quote prices on a special platinum lined Illium bomb. The advantages of this over the 

usual platinum lined steel bomb are obvious. 

PELLET PRESS and Mold, complete, for preparing fuel pellets for calorimetric determinations 

NEEDLE VALVE, for Combustion Work, constructed to make possible the drawing off of gases 
from high pressure oxvgen cylinders at an even rate and at such a moderate speed as to make 
it easily possible to count the bubbles passing through an absorbtion train 5.00 

OXYGEN CYLINDERS for use with Oxygen Bomb Calorimeter, see Gas, Oxygen. 

CALORIMETERS, Gas, see Gas Analysis Apparatus. 

CANS, Sample, see Boxes. 

113 






CAPSULES 




I mkai. sciKvni-M 00, '"t. a. ;q, U. 8. A 




No. ^408. 



No. 2412. 






No. 2416. 



No. 2118. 





24<>S. 



No. 2422. 





No. 2426 (shown in use) 



No. 2128. 




No. 2432. 



CAPSULES, Coors Porcelain, as used in milk analysis, ash determination in flour, etc With 
straight sides and flat bottom, glazed throughout. fcy, 25 ,. : diai r, «'•'.' mm; height, 
13 mm $0.42 

CAPSULES, Combustion, Bee Combustion Capsules. 

CARBON BATHS. gee Water Baths. 

CARBON DISSOLVING TUBES, see Test Tubes. 



2412. 
2414. 

L'416. 

L'llV 

2422. 

24i'-;. 



2427. 

242.H. 



CARBON DIOXIDE DETERMINATION APPARATUS 

CARBON DIOXIDE APPARATUS (Alkalimeter). Bunsen's 1.30 

CARBON DIOXIDE APPARATUS (Alkalimeter). Knorr's, for determination of carbonic acid in 
carbonates, especially baking powder, recommended by the Association of Official Agricultural 
Chemists. All joint, are ground together 12.00 

CARBON DIOXIDE APPARATUS (Alkalimeter), Mohr's, with two ground .joint-. 4.0O 

CARBON DIOXIDE APPARATUS (Alkalimeter). Schroedter's, with tube in flask 4.09 

CARBON FILTER TUBES, see Filter Funnels. 

CARBOY, Glass, in rubber cushioned crate, i apant.v ."■ u.ilh.ns 3.00 

carboy inclinator, Flaherty's, a lever Locks the carboj to the Lnclinator, and on account 
oi the shape of the rockers the carboy always returns t<» an upright position when released, A 
very convenient method of tilting a heavj carboy 10.00 

CARDBOARD. Bristol Board, best quality for drawing, in sheets 11x14 inches.. Each .05 

Per dozen .50 

casseroles, Cocis Porcelain, with lip and porcelain handle, glazed with exception of rim. 



No 

I lapacity, cc 

Diameter, nun 
Eeight, nun 
Each 



1 
30 

.-ii 

25 

.42 



2 

75 

7n 

35 

.48 



2432, 



.; 
150 

V, 

45 
.60 



CASSEROLES. Agateware, with handle. 
Manufacturer's rated capacity, oum 

Each 



3A 

210 
95 

.84 



.-.-■ 



4 
7o 

110 

62 

1.08 



4 A 

500 

133 

69 

1.38 



CATHETOMETERS. catalog F of Physical Apparatus. 

114 



a 
750 

14H 

1.68 

32 
-35 



50 2000 
165 175 



2.40 



130 
4.20 

64 

40 



rasg 



»fc : >* 



1 1 ■ 



<r~<~ 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A, 



CEMENT 





No. 2436. 



No. 308. 




No. k:445. 




Nos. 2440-2. 




CEMENT, aeundum REFRACTORY, for use in repairing mufflers, cores, el eo trie furnaces, and 
in general wherever a refractory cement of bigh thermal conductivity is desirable. Used exten- 
sively for covering resistance win- in electric furnaces. When mixed with water to make a 
thick paste it is ready for use. Furnished in three mixtures, RA 162 for general work, RA 355 
where a fine grained cement is required, and RA 305, for use where a cement with a vitrifying 
point of 500°C. is needed. Unless specified when ordering, mixture HA 162 will he furnished. 

In lots of, pounds 1 5 

2436 A. Mixture RA 162 $0.30 1 25 

'136B. Mixture RA 355 40 1.60 

24 ;:«;« \ Mixture RA J05 50 2 .00 

31(8. CEMENT, ASBESTOS (Retort Cement), fire and acid proof, for use with mullles, retorts, electric 
furnaces, etc. Put up in cans ready for use. 

Weight, pounds 1 5 

E aek 50 1.35 

CEMENT, De Khotinsky Laboratory. This well-known cement is not attacked by water, sul- 
phuric, nitric or hydrochloric acids, bisulphide of carl. mi, benzine, gasoline or turpentine, and 
is very little affected by ether, chloroform, caustic alkalies, etc. Comes in small sticks of about 
1 oz., large sticks of about 2 oz. and in bulk by the pound. Prepared in three different grades 
as follows: Hard for cementing glass, metal and porcelain; medium for cementing and in- 
sulating purposes; soft for insulating ami covering electric wires, for condensers, static ma- 
chines, protection against corrosion and for cementing rubber, hard rubber, wood, ivory, etc 

No A B 

Size Small Stick Large Stick 

2440. CEMENT, De Khotinsky Laboratory, Hard. .70 1,40 

2441. CEMENT, De Khotinsky Laboratory, Medium .70 1.40 

2442. CEMENT, De Khotinsky Laboratory, Soft .70 1.40 

L44:.>. CEMENT, Insalute, a fire-proof insrlating cement which will adhere to metal, porcelain and glass. 
When baked in an oven, it becomes very hard and cannot be removed without breaking into 
pieces. In this condition it is unaffected by heat, water or other solvents and forms an excel 
lent electrical insulator for eonneetions which are exposed to heat. In one pound cans, with 
directions for use. .45 

CEMENT, Rubber, see Rubber Cement. 
For other adhesive materials, see Glue and Wax. 

115 









CEMENT TESTING 



CENTRAL SCIENTIFIC ro. t r myACiO, IT. 8. A. 





No. 2464. 



No. 2-154. 






No. 552. 



No. 2456 



mm 






No. 645. 



No. 553B. 




No. 2160. 



No. 2462D. 

CEMENT TESTING APPARATUS 



552. 



553B 
562. 

645. 



24.">4. 
2456, 

L'460. 

2462, 



2464. 



AUTOCLAVES for Cement, see general heading Autoclaves. 

BALANCE, Cement Scale, for determining percentage of fineness of cement. Beam graduated on 

upper side to 1(5 ounces by % ounce, lower side to IOO9J by 1" Should be used in connection 

with our No. 12124 sieves. Can also be used for dirt in seed, moisture in grain, ores, etc. 

( Complete with brass scoop $12.00 

BALANCE, Cement, for fineness of cement, with beam graduated to weigh to 500 grains by 
1/100 gram divisions 19.00 

BALANCE, Decimal Scale, for mechanical analysis of road material; capacity, 30 pounds; grad- 
uated in 1 L'O pound divisions. (For illustration and description sec No, 562 under general 
heading Balances) 8.50 

BALANCE, Spring, for mechanical analysis of road material, consisting of a m might spring bal- 
ance with flat back graduated to 200 grama in one grain divisions and to 1"" percent i" <"» e 
percent, divisions; with small aluminum pan for weighing, i Sec Prevost Hubbard 'a " Highway 
Instructors H andbook , ' ' page 324 ) * , 16.50 

BRIQUETTE MOLD, American Society for Testing Materials Type, of brass with end clamps 4.25 

BRIQUETTE MOLD, American Society for Testing Materials Type, of brass with iron horseshoe 
clamp 4-25 

BRIQUETTE MOLD, Improved Form, American Society for Testing Materials Type, for separ- 
ating sections without rapping 4.25 

BRIQUETTE GANG MOLDS, American Society for Testing Materials Type, of brass with end 
and center clamps. 

E°- •••••;•/•. ••• ABODE 

.Number of briquettes 2 3 4 5 6 

M JSS? V • • 8 " 00 1200 16.75 20.00 25.00 

UKUSH, or brass wire in wood handle for cleaning briquette molds. Length of brush portion, 5 
mehes & ' B 1.00 

116 





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181 


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ID > 




MOIS 




MOLE 




1 ! 1 

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TAMP 




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MOLT 












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MOLD 
v 








1 


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Ha 


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inch 




Sam? 


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CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. CEMENT TESTING 





■iiii 



No. 2468. 



No. 2470. 







No. 2478. 




i<* 







No. 2472. 



No. 2473. 



No. 2486. 



No. 2488. 




No. 2482. 




No. 2498. 




id in »!*«* 

L0KS.W- 



111 

111 pCU*jPJ 

. 

I pw 

, v.ors*J 






J ! 

it 

20.00 ' 



2468. GILLMORE NEEDLES in block, for determining both the initial and the final set of cement. 
They consist of a pair of steel needles, one, i/jg inch in diameter loaded with a weight of % 
pound, and the other y,^ inch in diameter loaded with a weight of one pound $7.00 

2470. GILLMORE NEEDLES, same as No. 2468, but with vertical support to keep needles perpendic- 
ular to the sulfate of the pat. (Recommended by the American Society for Testing Materials 

in Specifications for 1921, No. C9-21.) 12.00 

MOIST CHAMBER for Cement, of soapstone, furnished to order. Prices on application. 

2472. MOLDS, Cylindrical, brass, for preparing cylinders used in determining the compressive strength 

of Portland eement mortars. Diameter, 2 inches; height, 4 inches. (See Tentative Standard 
of the American Society for Testing Materials C 9 — 16 T) 3.50 

2473. TAMPER, Steel, for use with No. 2472. Weight, about % pound; length, 6% inches; diameter 

at top, % inch; at bottom, 1 inch 3.40 

2478. MOLDS, Cube, of brass, with hinge clamp for preparing cubes for compression tests. 

No A 

For cubes, inches 1 

Each 4- 25 

2482. MOLDS, Cube, of brass, same as No. 2478, but in gangs of 2 molds. 

No A 

For cubes, inches 

Each 10.00 

2486. MOLD, Pat, for forming pats of neat cement intended for steaming tests 

2488. PAN, of galvanized iron, for immersing briquettes in water before testing. Size, 24x24x3 inches 

4.00 

2490. PLATE, of heavy glass, for use in mixing cement and filling briquette molds. Size, 24x24x*i 

inches • • * 750 

SAMPLE CANS for Cement, see Boxes No. 1828. 

2496. SAND, Standard, for cement testing, according to the American Society for Testing Materials. 

' per 100 pound bag 6.50 

SIEVES for Cement Testing, see No. 12124 under general heading Sieves. 

2498. SOUNDNESS TEST APPARATUS, Le Chatelier, for indicating the soundness of cement by its 

expansion after being boiled • • 

117 



B 

2 

5.75 

B 

2 
13.50 

3.50 






CEMENT TESTING 



nSNTRAL S.IKNTIIK- 00., CHICAGO, U. 8. A 







No. 2512. 



No. 2500. 



No. 1736. 





! 



No. 2502. 



No. 2514. 






1TM 



2503 



2500. SPECIFIC GRAVITY APPARATUS, Jackson's, for the accurate determination of the specific 
gravity of cement. Consists of a special burette calibrated to give specific gravity readings 
directly, ami s special flask with ground in funnel. (See Journal <••' »li" Society of Chemical 
Industry, Vol. XXIII, No. LI, for June 15,1904) $8.25 

1736. BOTTLE, Specific Gravity, Le Chaielier's, for cement, spei ial form recommended by tl>> United 

States Bureau "f standards for use in (iovemment Specifications, and by the American Society 

for Testing Materials. (See Circular No. 3*3 of the United States Bureau of Standards, sad 

A. S. T. M. Specifications for 1921, No. C9 21.) Without certificate 5-10 

BOTTLE, Specific Gravity, sam, as No. 1736, but standardized by the United States Bureau of 
Standards, with Certificate 9.50 

STEAMING APPARATUS, of polished copper, tinned on the inside, for boiling and steaming 
cement specimens for determining soundness. Mounted < MI sheet iron support with shelf of wire 
screen and gas burner. The large size is recommended as standard by the American Society 
for Testing Materials and the U. S. Bureau of Standards, but as this size takes up a large 
amount of room, we also list a smaller size of the same general type. 

No. A B 

Dimensions, inches 12x12x24 15x15x30 

Each 45.00 70.00 

CONSTANT LEVEL BOTTLE, for use with No. 2502. Capacity, 2 gallons 3-50 

TROWEL, for mixing cement. Length of blade, 4 inches - 70 

VICAT NEEDLE APPARATUS, Bramwell Improved Form, for determining the normal COM 
tency and setting tune of cement according to the methods recommended by the Vmerican 
society tor Testing Materials. The needles are on opposite ends of the :;<" im pinner rod. 
the rhang,- being made by reversing the rod. Diameter of large needle. 1 cm; diameter of snu 

removable needle, 1 mm . (See Standard Specifications Of the A. S. T. M. for 1921,09-21.) 27. 
2515. Rubber Mold only for No. 2514 3.50 



1614 
2512 

25 1 4 



small 
50 



118 






■ ; 

1 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



CENTRIFUGES 




! 



■ • ■ 
3 


















■ 






2324. 



2534. 



2537. 
2538. 

25;;:-. 

2540. 






No. 2537. 



No. 2534. 





No. 2538. 




y 

No. 2524. No. 2539. No . 2540. 

CENTRIFUGES 

CENTRIFUGE. Hand Driven, for two 15 cc tubes. This machine will whirl two IS cc tubes filled 
WltB liquid at 1J0O revolutions per minute when the handle is turned at the rate of one revo- 
lution per second. The strong iron horseshoe clamp with thumb-screw permits rigid fastening 
i ! ^'. nt " fu g e *° , the e*S* of a table so that the machine operates without vibration. Com 
plete with two-tube head, two aluminum shields and one each graduated and uneraduated 15 cc 
glass tul.es • " $10 75 

CENTRIFUGE Water Motor, for four 15 ce tubes. For attachment to a smooth 'faucet'.' Speed 
is controlled by the flow of water, which, with the head for four 15 cc tubes, will range from 
sou r. p. m. with 15 pounds water pressure to 1700 r. p. m. with 60 pounds pressure. Each 
machine is so constructed that bearings cannot become rusted nor ean oil be washed out Com- 
plete with three feet of pressure tubing, hose connection for attachment to smooth faucet one 
Jour-tube head, four aluminum shields and two each graduated and ungraduated 15 cc glass 
tubes l 21.00 

Two-Tube Head, only, for 15 cc tubes. For use on Nos. 2524 and 2534 Centrifuges. Without 
shields or glass tubes _ 3 u0 

Four-Tube Head, only, for 15 cc tubes. For use on Nos. 2324 and 2534 Centrifuges. Without 
shields or glass tubes 5 00 

Two-Tube Head, only, for 50 cc tubes. For use on Nos. 2524 and 2534 Centrifuges. Without 
shields or glass tubes. 6.50 

Four-Tube Head, only, for 50 ce tubes. For use on Nos. 2524 and 2534 Centrifuges. Without 
shields or glass tubes g.50 

For Shields and Glass Tubes for Nos. 2524 to 2540, see Accessories for Centrifuges Nos. 2524 to 
2563. 

CENTRIFUGES, Electric, desk size, for 15 cc tubes only. A small compact centrifuge mounted 
on a heavy iron pedestal, which contains a three-point speed-control switch and cut-off. A 
maximum speed of 1800 revolutions per minute with the two tube head and 1400 revolutions 
per minute with the four tube head can be attained. To insure stability, the tube carrier or 
head is made into a heavy balance wheel, equipped on the underside with four fan blades to 
create a steady current of air through the windings of the motor to prevent overheating on 
long runs. The arrangement of the blades is such that liquids cannot be accidentally spilled 
into the motor. The tube carriers or heads, supplied with these centrifuges, are completely 
equipped with trunnion rings, tube shields and glassware. If it is not intended to use the 
centrifuge in a cabinet, we recommend the purchase of Nos. 2562 or 2563 Centrifuges with the 
Protecting Dome to avoid the possibility of a serious accident. Dimensions without dome, 

119 









CENTRIFUGES 



CENTRAL SCIENTIFIC CO.. C HICAGO, U. 8. A. 



I 











u» 



V 




No. 


No. 


Nob. 


Nos. 


Nos. 


2550. 


2558. 


2738. 


2739. 


2557. 






2738A. 


2739A. 


2557A. 




No. 2563. 



No. 2560. 



CENTRIFUGES. Electric, desk size, continued. 

9% inches total height, ll 1 /.. inches rotating diameter. Maximum current consumption % am- 
pere. No special wiring is required for these centrifuges u thej may be connected into the 
regular lighting sockets without danger. Complete as described with attachment cord and plug. 



No. 



I: 



A.C. 



D.C. 



2560. 
2561. 
2562. 

2563. 

2564. 



110 
$38.00 
42.00 
50.50 
54.50 



220 

43.00 
47.00 
55.50 
59.50 



110 
38.00 
42.00 
50.50 
54.50 



220 

43.00 

47.00 

55.50 

59.50 



2550. 
2558. 

2738. 



2738A. 



2739. 



2739A. 
2557. 



2557A 



For volts 

With two-tube head 

With four-tube head 

With two-tube head and protecting dome 
With four- tube head and protecting dome 

Protective Dome, fur Nos. 2560 and 2561 Centrifuges, made of heavy spun copper, with closely 
fitting lid with handle, finished inside and out in black enamel. Can be easily attached. The 
use of this dome permits a higher speed and eliminates danger to the operator. Diameter, 
12% inches; depth, 5 inches 12.50 

Accessories for Centrifuges Nos. 2524 to 2563. 

Shield, Alu m inum, for 15 cc tubes. For use on Centrifuges Nos. 2524 to 2563 20 

Shield, Al um i n um, for 50 cc tubes. For use on Centrifuges Nos. 2524 and 2">34, when equipped 
with Heads Nos. 2539 and 2540 .35 

Glass Tubes, Plain, 15 cc, with conical bottoms. For use on Centrifuges Noa. 2524 to 2563. 

each, .12 

per dozen, 1.20 
per gross, 1200 

Glass Tubes, Plain, 15 cc, same as No. 2738 but of Pyrex glass each, .28 

per dozen, 300 
per gross, 30.25 

Glass Tubes, Graduated, 15 cc, with conical bottoms graduated in 1/10 cc divisions to 10 cc and 

in 1 cc divisions to 15 cc. For use on Centrifuges Nos. 2524 to 2563 each, .45 

per dozen, 480 

«i in l « per gross, 49.00 

Glass Tubes. Graduated, 15 cc, same as No. 2739 but of Pyrex glass each, 100 

m tv. t>i per dozen, 10.80 

t*iass Tubes, Plain, 50 cc, with conical bottoms. For use on Centrifuges Nos. 2524 and 2534, 

when equipped wnth Heads Nos. 2539 and 2540 . each, .25 

per dozen, 2.17 

Glass Tubes, Plain, 50 cc, same as No. 2557 but of Pyrex glass VIc^ ^ ^50 

per dozen, 5.40 
per gross, 57.60 
120 



r 



:•■■■ 



Ki 



541 


in 




0. 


n;t c* 




at 


• 


Via 






_•'.•• Spn 




• 




rt 




tk 




L 




b 


:v.\ clv 








11 




n 




It 




ib 




th 








dL 








. 








th 




N 




a 




ik 




«l 






*t 


1 

CUT 




I 


■■• 


1 ft 



•••■ 



CLV 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



CENTRIFUGES 



-=_w 



=.1 




cc 



No. 
2743, 



No. 
9170. 



No. 

2742. 





No - 12698 - Nos. 2670-2676. 

2556, Glass Tubes, Graduated, 50 cc with conical bottoms. For use on Centrifuges Xos. 2524 and 2534 

when equipped with Heads Nos. 2539 and 2540 , , .each? $ 60 

per dozen, 6.50 
2556A. Glass Tubes, Graduated, 50 cc, same as No. 2556 but of Pyrex glass each™ 85 ' ^*£ 

2743. Babcock Tube Human Milk, with stem graduated in per cent, of fat, each div^ioTr^.S 
0.2 per cent. tat. For use in shield for 15 cc tubes 45 

9170. Casein Tube, Hart's, for estimating the amount of casein in milk, 50 cc "capacity with'stem gradu- 
ated to 0.2 per cent, casein. For use in shield for .30 cc tubes 40 

2742. Vaccine Tube Hopkins, for vaccine standardization. To contain 10 cc vaccine' ' stem' graduated 
in 0.05 cc by 0.01 cc. For use in shields for 15 cc tubes . 60 

12698. Speed Indicator, improved form, may be run at highest speed required without heating The 
rotating disk, being carried by friction, may be easily moved to the starting point where the 
raised knobs coincide. Pressing the raised knob on the rotating disk with the thumb prevents 
the disk Irom moving until the hand of the watch gets to the right position to take the time 
Every hundred revolutions may be noted by feeling the knob pass under the thumb, thus re- 
lieving the eye which has only to look on the watch to note the time. Nickel-plated. . . . 1.50 

INTERNATIONAL ELECTRIC CENTRIFUGES 

2670. CENTRIFUGE, International No. 1, Type SB. An improved model of the compact, high power 
centrifuges, which have proven so satisfactory in the past for both routine and research work 
in bacteriological, physiological and chemical laboratories. This machine has an overall diam 
eter of 20 inches, is 24 inches high with the lid closed, 27 inches with the lid open and weighs 
about 300 pounds packed for shipment. The main improvement is in the motor, which is flex- 
ibly mounted to allow self balancing in case of slightly unbalanced loads. The lower end of 
:ln.' shaft of the motor runs on B ball step immersed in oil. The speed of the motor is con- 
trolled by a separate rheostat designed to mount on the wall. The limit of speed varies with 
different heads and tubes. The maximum centrifugal force with small loads is approximately 
2500 times gravity and with large loads 900 times gravity. A combination brake and brush 
release operated by a lever at the lower end of the motor shaft permits the operator to stop 
:he machine quickly or if desired to relieve the brush tension to allow the machine to come to 
rest as slowly as possible, thus preventing the stirring up of fine precipitates. The enclosing 
case, made of cast iron and rolled steel, is designed so that it may be easily washed out and 
the liquid removed through a convenient drain. A removable top is provided for the enclos 
ing case, which, with the drainage in the bottom, adapts it for use as a basket centrifugal. 
Complete with rheostat but without head or tubes, with motor for 110 volts, 60 cycles, 
A. C 166.50 

2672. CENTRIFUGE, International No. 1, Type SB, same as No. 2670, but for 220 volts, 60 cycles, 

A - 166.50 

2674. CENTRIFUGE, International No. 1, Type SB, same as No. 2670, but for 110 volts D. C. . 166.50 
-676. CENTRIFUGE, International No. 1, Type SB, same as No. 2670, but for 220 volts D. C. . . 166.50 

121 



I 



CENTRIFUGES 



CENTRAL B0D5NTOTC 00., CHICAGO, XT. 8. A, 
















No. 2678. 



No. 2679. 



No. 2681. 



V3 

No. 2682. 





No. 2684. 



No. 2683. 








No. 2685. 



No. 2686. 



Nos. 2696-2702. 









2678 
2679, 
2081, 

2682. 

2683. 

2684. 
2685. 
2686. 



2096 



. 



2698. 

27iiO. 
2702. 



Heads for International Centrifuge, Size No. 1. 

Head, Four-Place, for 15 cc tubes, with attaeheil trunnion rings for Xo. 2728 metal shields. $ 9.00 

Head, Eight-Place, for 15 cc tubes, with attached trunnion rings for No. 272s metal shields. 15.50 

Head, Four-Place, for 50 cc trunnion rings Xo. 2732. Will also carrv trunnion cups Nos. -733 and 
2735 9.00 

Head, Four-Place Combination, with attached trunnion rings for two 15 cc metal shields Xo. 
2728 and places for two 50 ce trunnion rings Xo. 2732. Will also carrv two trunnion cups 
Nos. 2733 and 273.1 9.00 

Head, Eight-Place Combination, with attached trunnion rings for four 15 ce metal shields No. 
2728 and places for four 50 cc trunnion rings Xo. 2732. Will also carrv four trunnion cups 
Xos. 2733 and 2735 .* 16.20 

Head, Two-Place, for carrying trunnion carriers Xos. 2736, 2737 and 2759 for Squibb separator? 
funnels, Goetz tubes and 250 cc bottles 4.50 

Head, Eight^Place, for 50 cc trunnion rings Xo. 2732. Will also carrv trunnion cups Xos. 2733 
and 2735 * F U.40 

Disk, Board of Health for Milk Sediment, to carrv twenty 2 cc tubes Xo. _ Without 

tubes * 15 75 

For Trunnion Rings, Carriers, Cups and Metal Shields, see Fittings for International Centrifuge 
Heads. 




releasing •— 

tZuI TT 1S J 1 " ' a W se P arate speed-control rheostat for mounting on the wall. 

wiar«v?tv 8P eed . va " es . w, i h th L e different he;, , ,ul tul.os. A centrifugal lor.e of 2050 

nr^nnrf o^ iv Ca r *, " ame . d +1 wlt v b a four.plaoe head fitted with 50 cc tubes, other loads vary 

6 ZTl > Com P Iete Wlth rheostat ^t without head or tubes, with motor for 110 volts 
ou ..Miis a. l 230.00 

CE^rIfupf Tnrt^t! 0113 ! 2°- I' ""** ** Xo " ™*> hut for ^^0 "volt", 'oo "cVcles A."c .' ." 230.00 

CENTO mirv Tnt! , S°" 2 ' Same aS N °- 2696 ' but for U0 «** *>. C 230.00 

CENTRIFUGE. International No. 2, same as Xo. 26i>6, but for 220 volts D. C 230.00 

122 






'■KXTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



CENTRIFUGES 





No. 2681. 



No. 2685. 





No. 2686. 



No. 2704. 



No. 2705. 




No. 2706. 




No. 2708. 



2681. 
2685. 

2686. 

27<)4. 

2705. 
2706. 

2708. 



•i 



xin a V t>, £ H - eads for I nternational Centrifuge, Size No 2. 

He £.^rS WlWilR* 2732 ' Wi " " ls ° ~* '--'- -» ** •& 

3m B TW0 Pl f a « ea J th ^ "^ S ? <Ument ' t0 2^ ''""^ »•• tubes No^TSO.Wtti.ort tubes l&TC 

^^O^Wts^Z^e'lr,;,"/ 3 " 1 " 8 N ° S - 2736 ' 273? -^^-ior- Squibb •separa.oVv 
He N^ E 'f^-"7 e ,?r>--?J i0,1 i f0r M 8i,C 5 ° ° C trU i ,ni " n ""** No. ^T^Vnd 'two 'trunnion carrin's 

«&£g ^^W^^nlZ^^a^^f r b0 " ks ' Wi,, lB ' S 5 
**%££ SX'^.^. H . ug3 No ' 2732 ' Wi " alao «" ry tru - i0 » -*'**"• 

"MlMMllMMliliiiij irfi-Ul) 




CSCe. | 

I 
I 




No. 2710. 
No.2711. 





No. 2712. 
No. 2715. 




No. 2714. 
No. 2715. 



2710. 
2711. 
2712. 
2713. 
2714. 
2715. 



No. 2713. 
No. 2715. 

Fittings for International Centrifuge Heads, 

™L Shield ' for 10 ° cc S lass tubes Nos - 2716 amI 2716A. I'ur use in No. 2711 trunnion ring 
With rubber cushion § 1 # 00 

Trunnion Ring, for 100 cc metal shields No. 2710. For use with heads Nos.' 268 i.' 2685 and 2706 

on size No. 2 centrifuge only .50 

Metal Cup, for 9 inch Babcoek bottles. For use with No. 2715 trunnion "ring on" head No. 2708 

on size No. 2 centrifuge only. With rubber cushion 1.05 

Metal Cup, Special Long, for 9 inch Babcoek bottles. For use with No. 2715 trunnion ring on 

heads Nos. 2681, 2685 and 2706 on size No. 2 centrifuge only. With rubber cushion 1.45 

Metal Shield, for 100 cc tapered glass oil tubes. For use with No. 2715 trunnion rings on heads 

Nos. 2681, 2685 and 2706 on size No. 2 centrifuge only. With rubber cushion 1.75 

Trunnion Ring, for metal shields Nos. 2712, 2713 and 2714. For use with heads Nos. 2681, 2685, 

2706 and 2708 on size No. 2 centrifuge only 55 

123 
















CENTRIFUGES 



CENTRAL SCIENTIFIC I O., CHICAGO, U. 8. A 



Tl 



I 




PN 



C5 Cc 



\ i 



\ i 





) 

m I 

f 



No. 2728. 
No. 2731. 



No. 2730. 
No. 2732. 



i 

I 

I 



i i 



No. 2729. 
No. 2730, 




No. 2733 



No. 2735. 




No. 2736. 



2728. 

2781. 

2729. 
2730. 
2732. 
2733. 
273"). 
2736. 



Metal Shield, for 
ring No. 2731 or 



10 to 15 cc glass tubes Nos. 8738, 2739, 8742 and B743. Foi in trunnion 

r attached trunnion rings on heads Nos. 267*. 2679, 2682 and 2683. With rubber 



cushion 



S 70 



Tr unni on Ring, for 15 cc- metal shields No. 2728. Pot use with heads Nos. 2681, 2685 and 2706 

on size No. '2 centrifuge mily .60 

Reducing Cap. by means of which glass tubes Nos. 27:iH, 27:i9 ami 2742 may I.. need in metal 



>ln<M 



.20 



Metal Shield, for 50 cc glass tubes Nos. 2744. 274.">, 2746 and 917". Poi DM in trunnion ring 
No. 2732. With rubber cushion 85 

Trunnion Ring, for .".0 cc met:il shields No. 2730. For use with heads Nos. 8681, 2682, 2683, 2685, 
2706 and 2708 50 

Babcock Test Trunnion Cup, for 6 inch Babeock milk bottles. For use on beads Nos. 2681, 2682, 
2683, 2685, l'706 and 2708. With rubber cushion .80 

Trunnion Cup, Square, for sputum bottles No. 2757. For use on heads No*. 2681, 20* r,v,, 

2706 and l'7uv With rubber cushion 2.05 

Trunnion Carrier, for 150 ec Squibb separator- funnels No. 2748. For use with heads Nos. 2684 
2704, 2705 and 2706 " ? 270 







No. 2737. 



No. 2759. 



No. 2759 A. 



No. 12698. 



27.7. Trunnion C ^ e ^^* tubes No. 2749. For use with heads Nos. 2684, 8704, 2705 and 2706 



With rubber 



3.00 



2759. Trunnion Carrier, for 250 cc ■ •Sterilizer" bott.es No. 2760. For use with heads B 8664,2704, 



2705 and 2706. With No. 2762 rubber cushion "" ™ W "'"^ "* """> "i 50 

2759A. Trunnion Carrier. = No. 2759 but furnished with NoV^3 '££ ^^ ' wi.i carry No. 

12698. ! *^ d ^™P'0^d W amy b€ run at highest' speed Required without' heating.' ' The ro- 

a d kTol n, J by friction, may be easily moved to the starting point where the 

Si' "disk from movJn^n^ST 1 ? th J *?*?* kn ° b °" th ° r ° tatin « &* " Ith the thumb prevents 

^^SmSSS^^^ iLS* Wat,h ■*■ t0 tht> "«»'» Initio, to take the time. 

Heviig the eye which haTonT .? n J ted *? feelin * the knob » )ass under th<> tll " l " ,, • thus re ' 
«eving me eye which has only to look on the watch to note the time. Nickel-plated . . 1.50 

124 





rw 




a 




»: 


* • 


M 




Go* 













736, 



l| 

i | 

I 

I 

'-••■,■ 

i 

I 

ids.?** 

u 



* 



/ 



II 

ill an 






If, 



CENTKAL SCIENTIFIC CO., CHICAGO, U. S. A. 



CENTRIFUGES 



V 



«. V. 









« — I 

¥ 






No. 2738. No. 2739. No. 2742. No. 2743. No. 2744. 
N0.2738A. N0.2739A. No. 2744A. 





" • 



No. 2745 



J 

No. 2746. No. 2716. No. 2717 
No. 2746A. No. 2716A. No. 2717 A 



Glassware for use with Nos. 1 and 2 International Centrifuges. 

2738. Glass Tubes, Plain, 15 cc, with conical bottoms. For use in No. 2728 metal shield or in No 3730 

metal shield equipped with No. 2729 reducing cap each $ '^ 

per dozen, 1.20 

per gross, 12.00 

2738A. Glass Tubes, Plain, 15 cc, same as No. 2738 but of Pyrex glass .' each, .28 

per dozen, 3.00 
pergTOss, 30.25 

2739. Glass Tubes, Graduated, 15 cc, with conical bottoms, graduated in 1/10 ec divisions to 10 cc and 

C l d xT V1S1 «°£n to I 5 CC ' F ° r USe in No " 2728 mctal shield or in No - 273 ° m ^al shield equipped 
with No. 2729 reducing cap each, 45 

per dozen, 4.80 
per gross, 49.00 

2739A. Glass Tubes, Graduated, 15 cc, same as No. 2739 but of Pyrex glass each, 1.00 

per dozen, 10-80 

2742. Vaccine Tube, Hopkins, for vaccine standardization. To contain 10 cc vaccine, stem graduated 

in O.Oo cc by 0.01 cc. For use in No. 2728 metal shield or in No. 2730 metal shield equipped 
with No. 2729 reducing cap _ .60 

2743. Babcock Tube, Human Milk, with stem graduated in per cent, of fat, each division representing 

0.2 per cent, fat, when 5 cc of milk is used. For use in No. 2728 metal shield 45 

2744. Glass Tubes, Plain, 50 cc, with lip and round bottom. For use in No. 2730 metal shield. 

each, .20 

per dozen, 2.15 
per gross, 21.50 

2744A. Glass Tubes, Plain, 50 cc, same as No. 2744 but of Pyrex glass eacb, .45 

per dozen, 4.80 
per gross, 51.85 

2745. Glass Tubes, Plain, 50 cc, with narrow neck and round bottom. For use in No. 2730 metal shield. 

each .33 

per dozen, 3.60 
per gross, 38.00 

2746. Glass Tubes, Graduated, 50 cc, with short tapered bottoms and pourout. Graduated in >/ 2 cc 

divisions to 10 cc and in 1 cc divisions to SO cc. For use in No. 2730 metal shield.each, .60 

per dozen, 6.48 

2746A. Glass Tubes, Graduated, 50 cc, same as No. 2746 bat of Pyrex glass each, 1.40 

per dozen, 15.00 

2716. Glass Tubes, Plain, 100 cc, with lip and round bottom. For use in No. 2710 metal shield. 

each, .30 

per dozen, 3.20 
per gross, 34.50 

2716A. Glass Tubes, Plain, 100 cc, same as No. 2716 but of Pyrex glass each, .50 

per dozen, 5.40 

2717. Glass Oil Tubes, Graduated, 100 cc, with tapered bottom and narrow neck. Graduated in 1/20 

CC divisions to 1 cc, 1/10 cc divisions to 6 cc, V* cc divisions to 10 cc and 1 cc divisions to 100 cc. 

For use in No. 2714 metal shield each, 1.50 

per dozen, 16 20 

2717 A. Glass Oil Tubes, Graduated, 100 cc, same as No. 2717 but of Pyrex glass each, 2.50 

per dozen, 27.00 

125 






CENTRIFUGES 



. liNTRAL SCIENTIFIC CO., CHHACU, U. S. A 












No 2748 No. 2749. Nos. 2750- No. 2757. Nos. 2760 and No. 2765. No. 9170. No. 9120. 

2751. 2761. 











2748. 
2749. 



2750. 
2751. 

2757. 

2760. 
1578. 
2765. 

9170. 
9102. 

9114. 

9120. 

9122. 

9092. 



Squibb Glass Separatory Funnel. 150 cc. Tor use m No. 8736 trunnion carrier $ 2.85 

Goetz Glass Phosphorus Tube, graduated at 25, "(» and inn n and with stem graduated in 0.002 cc 
divisions to 0.2 cc, with glass stopper. i\.r use with No. 27.'.7 trunnion carrier with No. 2761 

rubber cushion 2.85 

Milk Sediment Tubes, Board of Health, 2 cc capacity. Fur use in No. 2086 disk .per hundred,. 4,25 

Rubber Stoppers, for No. 2750 milk sediment tubes per hundred, 4.50 

Sputum Bottles, Square, in <■«• rapacity, with corks. For use in No. 273S trunnion carrier. 

per dozen, .85 
per gross, 9.25 

Sterilizer Bottles, 250 cc, with narrow neck and round bottom. For use in No. 2759 trunnion 
carrier per dozen, 2.10 

Glass Bottles, "Wide Mouth, 8 oz., flint glass. For use in No. 2759A trunnion carrier. per dozen, 1.40 

per gross, 13.75 

Potash Tube. Sherrill, with wide top and capillary sti m graduated by 0.1 per cent, to 15.0 per cent, 
of K 8 0. See Journal of In. I. and Eng. Chem., VoL XIII, No, 3 tor March L921, page 227.) For 
use in No. 2710 metal shield 2.00 

Casein Tube, Hart's, for estimating the amount of casein in milk, 50 «•«■ capacity with stem gradu- 
ated to 0.2 per rent, casein. For use in No. 2730 metal shield 40 

Babcock Milk Test Bottle, u Inch, 18 gram, B per cent. Graduated to 1/10 per cent. For use in 

No. 2733 trunnion cup each, .28 

per dozen, 3.00 

Babcock Cream Test Bottle, 6 inch, 9 gram, 50 por cent. Graduated to '•_• por cent. For use in 

No. 2733 trunnion eup each, .40 

per dozen, 4.30 

in 
each, .40 

per dozen, 4.30 

use in 
each, .15 

per dozen, 4.90 



Babcock Cream Test Bottle, 9 inch, 18 gram, 30 per cent. Graduated to 0.2 per rent. For m 

No. 2712 and No. 2713 metal cups each, .4 

per dozer 

Babcock Cream Test Bottle, 9 inch, 18 gram, 50 per cent. Graduated to J >. per cent. For 
No. 2712 and No. 2713 metal cudb each. 



Babcock Butter Test Bottle. 9 inch. 9 gram. 90 per cent. Graduated to '•• per cent. For use i 
No. 2712 and No. 2713 metal cups " each, .1 



in 
55 



2718. Rubber 



2719. Rubber 



•27 22. 


Rubber 


2753. 


Rubber 


2754. 


Rubber 


2761. 


Rubber 


2762. 


Rubber 


2763. 


Rubber 


2755. 


Rubber 


2756. 


Rubber 


2764. 


Rubber 



Rubber Cushions for International Centrifuge Shields and Trunnion Cups. 

Cushions, for No. 2710 metal shields when used with loo cc round bottom glass tubes. 

each, .20 

per dozen, 1.92 

Cushions, for No. 2711 metal «dii«d,i when used with 100 cc tapered glass oil tubes. 

each, -60 

Cushions, for Nos. 2712, 2713 and 2733 metal Babcock cups per dozen, .55 

Cushions, for No. 2728 metal shield for 15 ee glass tabes . per dozen, .72 

Cushions, for No. 2730 metal shield for 50 cc glass tubes per dozen, 1.44 

Cushions, for No. 2737 trunnion carrier for Goetz tubes No. 2749 each, .75 

Cushions, for No. 2759 trunnion carrier for No. 276 I sterilizer bottles each, .50 

Cushions, for No. 2759A trunnion carrier for No. 1578—8 ounce bottles. . . .each, .30 

Caps, for glass tubes Nos. 27:;s, 27.^.\, 2739 and 2739A per dozen, 3.00 

Caps, for glass tubes No. 274.") per dozen, 3.25 

Caps, for glass sterilizer bottles No, 2760 ................ ,.V^ dozen, 3.60 

126 




W^^i 



■ 



" 



CENTRAL SCIENTIFIC CO., CHICAGO, U. fi. A. 



CENTRIFUGALS 



<, 



u 





N bu- 
rnt^ 

H 

***! 

- 

erdoat. 1J 

WPHK 

•p- 
II 

I 

ell J 
rdMffl. U 

A J| 

. Forwi 

dL I 

fc I 

■::.-: • 



state 

doia 1* 
I tula 

i. : 

doiea J 

tan 1 * 

LI 

It* - 

Hi* J" 




2770. 



2772 



2774. 
277G. 




No. 2770. 



No. 2772 (Shown with a collecting jar). 




ing crystals, etc. Where corrosive materials are used, the inside of the iron case should be 
coated with some resistant material, such as parafiine or acid proof varnish. The case is pro- 
vided with an outlet at the bottom for draining $30.00 

CENTRIFUGAL MACHINES, of acid proof construction, with porcelain basket, and cast iron 
draining chamber and cover coated with acid resisting enamel. Especially adapted for determin- 
ing yield of sugar in refinery laboratories, and for drying crystals in the experimental manufac- 
ture of chemical salts. The centrifuge is housed in a cast iron frame with enclosed direct 
connected motor with special bearings. The enameled cast iron draining chamber has an out- 
let at the bottom and the base is cut away to allow a collecting jar to be placed beneath the 
outlet. Complete with rheostat for speed control, perforated porcelain basket 6 inches in 
diameter and interchangeable four-tube head with set of 10 cc plain glass tubes. Dimensions: 
height over all with cover closed, 22 inches; with cover open, 34% inches; diameter of cast 
iron chamber outside, 11 inches; maximum speed permissible with porcelain basket, 2500 
r. p. m; speed with four-tube head, 3000 r. p.m.; shipping weight, 160 pounds. 

No A B C D 

v> u A( ' D - C - 

* or volts 110 220 110 220 

Each 160.00 160.00 160.00 160.00 

Note:— if larger centrifuges are desired than the preceding, information will be furnished and 
prices quoted upon receipt of specifications giving purpose for which used, size of basket or 
number of tubes, speed desired, character of driving power, etc. 

Perforated Porcelain Basket, 6 inches in diameter 30.00 

Perforated Bronze Basket, 8 inches in diameter 32.40 

CENTRIFUGES, Babcock or Milk Testing, see Milk Testing Apparatus. 
CENTRIFUGES, Moisture Equivalent, see Soil Analysis Apparatus. 
CENTRIFUGES, Soil, see Soil Analysis Apparatus. 

127 



CENTRIFUGALS 



CENTRAL SCIENTIFIC CO. , CHICAGO, TJ. 8. A 







2784, 










2789, 




No. 2784. 

CENTRIFUGAL MACHINE. Sharpies Super Centrifuge. A laboratory centrifugal designed for 
tin- application of extreme speed and centrifugal force to a continuous stream of liquid. The 
rate at which the liquids may be clarified depends upon the fjize of the particles to be precipi- 
tated. With the maximum centrifugal force attainable (41,2.">o tii gravity) colloid particle 
just visible with an ultra-microscope may be separated from liquids on continued application 
of this force. Fractional precipitation of suspended matter may be accomplished by properly 
regulating the speed of the machine, as there is a critical feme, depending on the density of 
the particle, below which it is practically impossible to precipitate it owing to the force of 
surface tension opposing its subsidence. By passing the liquid repeatedly through the ma- 
chine and increasing its speed each time the particles will be removed in the order of their 
density. 

By means of this centrifuge colloidal particles may be separated from liquids; bacteria and im- 
purities may be removed from hot agar solutions; calcium soaps from wool fat, and oil soap 
and fatty acids from gelatine; water from fusel oil; suspended matter from lacquers, acids, 
glue, etc.; sulphuric acid from oil; pigments from paints and varnishes, and many other deter 
initiations and separations made which otherwise can In* effected not at all or with great diffi- 
culty. Especially valuable in the chemical laboratory for slow filtering precipitates such as 
ferric hydrate, ammonium phosphoniolyhdatc, arsenic sulphide, etc., in routine analysis. 

The machine consists essentially of an iron frame cast in one piece. Within this is suspended a 
seamless tubular tin-lined steel bowl, by means of a flexible Bpindle, with a COne at its upper 
end, running on ball bearing-. By means of the cone bearings, wear is automatically taken up. 
At the lower end of the bowl is a guide or drag which keeps the bowl centered and absorbs 
vibrations. Parts are easily removed for cleaning and can be readily and economically re- 
placed when worn. 

The liquid comes in contact only with tinned surfaces except in passing through the feed nozzle, 
which is of nickel; consequently weak acids or alkalies mav be handled continuously 01 
stronger reagents for brief periods. If desired the machine parts mav be obtained plated with 
gold, silver, or platinum, at an additional charge. 

inches. 

wheel is 

at the 



goiu, saver, or platinum, at an additional charge. 
The machine is 24 inches high and weighs 50 pounds. At the base it measures 10% bv 8 i: 
The inner bowl, which is 2 inches in diameter, has a capacity of 2.50 ee. A turl.ui wh 
attached to the shaft for driving with compressed air or steam at 22 pounds pressure ; 
maximum sp,ed of 40,000 r. p. m. When operated bv compressed air, 16 cu. ft. are required per 
minute, ami with steam, 100 pounds of water are required per hour. Complete with steel bowl 
and speed indicator 



$150.00 

CENTRIFUGAL MACHINE, Sharpies Super- Centrifuge, Biological Model. A modification of the 
JSo -,84 machine to meet the requirements of the medical laboratory more fully. The modi- 
fications are only in design to permit easy dismantling for sterilization and to reduce the con- 
tact of the liquor with the drag. For biological work onlv one outlet to the bowl and one de- 

ni-,S?i 1S r T ,r /V!i T* l et 0f th0se has b **n eliminated in this model. This machine 
*tp P P ? uZ * V eU ^ Pt / d f ° r the P re P ar *tion of vaccines. Finished in white. Complete with 
steel bowl and speed indicator 160.00 



128 






_ v- * 



*.**? 



.fE^Zf^saranpic co., Chicago, u. s. 



A. 




Altmmum 

Antimony 5f'bi-m 

Ar$on 

Arsenic 

Banum 

Bismuth 

Boron 

Bromine 

Cidmium. 

Ciesium, 

Calcium 

Carbon._ 
Ctnum 



n .— — - .. — - H— 11 ■■■ij sis — _ ^^_^___ 



So. 
JL 
_As. 

B* 
Bi 
B 
Br 

.Ci 



Chlorine 

Chromium. 

MR 

[olumbiumiujum 

Copper i Cuprum) 

Dysprosium 

Eroium. 

EurooiiM 

Fluorine. 

Gadoimium 

Gallium 

6ormaniuni 

Glucin[nn.iB(fr«iML_ 
Gold kurtm, 



.Cs. 
C* 

.c 

Ct 
A 

Xr 
Co 

Cb. 
.Cm. 



U 

Eu. 

f 
_64 
_6j 

6e 
_6I 

An 



m 

KM 
39.3 
75.0 

13737 

2080 

11.0 

7332 

11240 
132 1 
♦0.09 
12 00 

140 25 
3546 

52-1 

H37 
335 

63V 
1525 
167.4 
I5U 

19.0 
1573 
695 
725 

9.1 
137.2 



r1elium,_ 
Hydrogen 

Indium. 

lodmt 



_He. 

H 



Indium 

Iron. Ferrum'. 

Krypton. 



I 



iMMft , 

Le3d WumOurn 

Ulhium 

Lutecium. 

A*gnesi««._ 
N«n(ifltse 



A. 



gg*7bu sciepfrim to 



Jl 

Mi 

Jl 

Ha 

HI 

Jk 

Ji 

I. 

-0s. 
J 

_P 
_PL 

MMBUMta R. 

Praseoihrmium. ff 

tadium. i^ 



Hcrcury itwnffcmjm 

Molybdenum. 

ReodyrniuiiL 

Hm. 

NiCW. 

Ritrofcn. 

OSfflhM. . 

flxyjen 

MladiM ~ 

Phosphonii._ 
Platinum. 



4.0 

ioob 

IH8 
12692 
1931 
S5SS 
818 
1330 
207 TO 
700 
174 
24 32 
5493 
200 
360 
K43 
200 
5868 
W0 1 
190 9 
16 00 
1067 
31.0 
1350 
3110 
Mil 
226.4 



Rhodium ___ 

Rubidium 

Ruthenium. 

Saminum 

Scandium^ 

Selenium.. 

Silicon.. 



Eh 

Rb 

Ju 

5a 



Silver vtinum ( 

Sodium, ilainyrni 

StnnUun. 

Sulphur 

Tantalum. 

TeJIunwn. 

Terbiu m. 

rhalliunx 



St 

SI 

Ha 



S 

Ta. 



Thorium, 
thulium 

Tin. SUnrmm, 



Titanium. _ 
TunjstenLi*oirnm.umi 

Uranium , 

Vanadium _ 
Xenon. 



TtteitiurrtMrrtii 

Yttrium. 

Zinc 

Zirconium. 



„Tb. 

_TL 

.Th. 

Tm 
_5n 

Jl 

w 

J 

Jl 

Xt 

-lb 

1 

-hi 
-It 



MttM *l-J 






102 3 
8S4S 

iou 

'504 

44 1 

732 

163 

IC788 

23 00 

87 62 

32.07 

1810 

127 5 

1592 

2040 

23242 

168 5 

119 

481 

184 

238 5 
512 

1280 
1720 
69 
6537 
506 




L'MIII. 



CHAETS 



1478. 



2804. 



No. 2804. 

CHAMOIS SKIN, for cleaning instruments, etc. 

- N " 

•Size, inches \ B C D 

Each " ,,x8 9x1 1 10x13 14x18 

CHAKCOAL STICKS, ,,a.ura.„i ll ow\'v„;,i I .4xi x ',, ii ;;h, s $0 ; 12 ... ** ™ ea \°% 

r „ . __ , 1»% discount in lots of 144. f ' *"* Xl ° 

™tS y At ^ ^ t ;„,^ s mpil M 1 „uuied r - F -, w - Cl r k : and - ™ •• ft « *«— . che»i«i 

*sxez intnes. Mounted ou lmen back on common i (.Hi i, 3.6O 



Periodic Classification of the Elements 



ACCOKDINU TO MCSOEl.rOCFT 
ON BASIS O '18 



Series 



I 

2 
3 

4 

5 

6 

7 

a 

9 

10 

II 

12 



Group 



He-4 
Ne*0 

4395 



Group I 



H-l 



ti=7 



KNHfl 



Xe 128 



Ni-23 
K-39.1 

Cu-G3J3 

Rb 855 

AJI0793 
LVI32i 



Group 2 



Aiil97? 



GI9I 
M{=244 

C«=40J 

Zn-654 

Sr.BZG 

Cdll24 
Ba 1374 



Group 3 



B 

Ah 271 

Sc ■ 44J 

Gs-70 

y-89. 

In. 115 
La-1389 



Group 4 Group S 



He 200 TI=204J 
»a=225 



C-12 
Si -284 

Ti-4ai 

Ge-725 

Zr-90.6 

Sn-119 

Ce-14025 



Pb<206.9 
Th-2325 



N-14 
P-31 

V-5L2 

As-75 

Cb-94 

Sb-1202 



Group 6 



0-16 
S-32 

Cr-521 
Se-712 

Mo-96 
Te-1276 



Group 7 



F-13 
Cl-3545 

Mn-SS 
Br-7935 



Group 8 



Fe-553 
Ni-587 
'Co-59 



Ru 1017 

Rh-103 

IM'IKS 



I-I26J7 



Ta-I8l 
0.-208 



W-184 



U 2385 



Os-191 

lr-193 

lPr-1948 



TJrmtl wnmrir rn somt " "**" i<J"**r* hot locatco - »u« vmcrimum 

uxnM.5or*nr/ccQ lasowwt Amunros 



* a* 



280fi. 



No. 2806. 

C ^d;iH e ff deleJ ff ? ri ° diC , S r teW - The • peri0(lic "rangement of the elements according to 
iinV« K 3 i ' aS1S ° f ° =I6 ' American nomenclature. Size 42x62 inches. Mounted on 
''"'" jack on common rollers o c« 

ttAKTS, for Botany, Zoology and Physiography, Jcnd for special" bu'lietin' 

129 



3.60 



CHARTS 



CEKTBAL SCIENTIFIC CO, CHIOAGa r. S. A 



INTKUNATIONAt MKTHIC SVSlbM 







I 




No. 2807. 

-so? CHART Metric showing in full si ■ and in p rspective where accessary the i atom* 

_mi,. LiiAiii, menu-, .»"»M - avatem for comparison. Tsblei Bhowi iratior o1 
lion.] mttrli ursten with rait ol the ^ » i(i , ;iK| . 

ii- metrie units | „ ,,„„, ,,„, k .„„„„,„ ,,,;. . $2 .00 

2808 CHART"s p ;ctn;n. ,&&g6 " S and 1- intermediate ■ tb two t »tt a. o 8ha 

- ,0 S5 ac. rap, rysrs. 

us obtained by a prism, and a 01 frays, sno * in i» _ __ > o 

2812 CHART %SSL!£ Sounfed oflfcS b^k"With co^ ^«7m5 ; ^r^nn^ £ ring 

* ***«' <ai* -.-f...... ipectm J cm K. W ' »• U Xa, 1 l O.M0 

2814. oS&U d Sp^S^riam" S Na 2812, ^Tththe follojring 7"Tn, i . I* M i t, Co, 

Ni, Fe 28i57""CHART."stain Removal (Anti-Stain Formulary). A disk 

,li\ ided into 16 sectors, each w ith the os of a Btain 
Lng agent, revolves in a frame b.a semi-circle on 

which arc the names of s i.inda of <i..th When the name ol 
the Btain is placed opposite the cloth stained, nil lean 

through holes in the diak which refer to s list ol th 
i hemicals found on tin I 4 the era! d iodi 

.,,.,. prince the bacli ol the chart, which thus forms a mosi 
useful device in the Inl.orarory postpaid -15 













No. 2818. 



No. 2820. 



No. 2S28. 



No. 2815. 



No. 2830. 






lni.; 

2818. 
2820. 



2sl>2. 

L's28. 
2830. 



No. 2822. . . 9 

CHEESE CLOTH P er y anl ' 

10' ; discount in lota of 10 yards. 25 r ; discount in roll of 100 yards 

CHIMNEYS, Students' Lamp P er dozen "." 

CHIMNEYS. Argand, si raight, 2x7 inches P er dozen X 

CLAY PIPES. B ee Pipes. Clay. 

CLOTH. Emery, see Emery Cloth. 20 

CHISEL. Cold, length 6 inches, width of blade % inch o'oO 

CHLORINE ABSORPTION APPARATUS, Bunsen Fresenius, with Bask ground on *' v 

CHLORINE TUBE, l'xIOO em, for showing decomposition of water by chlorine 

130 



if 



d£ 



S 



I 



r 



cum 

CLAM] 
CLUO 






••' CLAM] 
larii 

• % - clam 
clahi 

•' CLAMJ 
CLUQ 

* cum 






■» clamj 

* CLAMJ 
CLAMP 



■ 3 



-*:i^> : 



**•'. 




CEWTBAL SttENTmc CO., CHICAGO. U. S. 



A. 



CLAMPS 




No. 2838A, 




No. 2840. 




No. 2860. 




NO. 2848. 




No. 2850. 





No. 2856 



No. 2852 





No. 2864. 

No. 2862. 

CLAMPS, ALL KINDS 

2*4 2. CLAMP. Burette, .ame as No. 2840, but with jaws rubber covered 55 

W50. CLAMP, Burette, or tube, of brass, nickel-plated, for screwing into wall o'r'shdf ' Oner, in front 
leaving gra.luations uncovered for reading. . ...... mm . P Lj 

2852. CLAMP Burette, Bunsen, of stamped steel witb rounded jaws, for' use with "damp" holder No 

tit % "nchw .':. ^' es :.^:..! vid ^ h . of . openi,,g ' 2 iutbC8; total ,en « th ' 9 inches = ««5«S 

2854. CLAMPS, Burette, Bunsen, same as No. 2852, but with rubber covered jaws..... ........ 45 

2856. CLAMP, Burette, double, same as No. 2848, for two burettes 75 

2860. CLAMP, Burette, Hofmann's, double ....... /."..". LOO 

2862. CLAMP, Burette, double, designed by Prof. Lincoln of the University of Illinois. Burettes are 

new perpendicular and are easily removed. A very convenient and rigid clamp, nicely made. 

_9Q 

2864. CLAMP, Condenser, new form, with V-shaped jaws of stamped steel, enabling very small tubes 

to be clamped. For clamping thermometers, burettes, condensers, etc. For tubes up to "' 
■nthes; total length, 11 inches; diameter of rod, % inch . . "55 

2865. CLAMP, Condenser, same as No. 2864, but with rod 12 inches long. Total length, 17 inches .60 
F151. CLAMP, Condenser, same as No. 2864, but with nickel-plated rod 12 inches long 1.00 

Note.— 10% discount in lots of 12, 25% discount in lots of 144 from all prices on this page. 

131 



^H 



CLAMPS 



centhal Boawrmcoa, omcAQO, v. a a 





No. i*70. 



No. 10412. 






No. 2882B. 



No. 2b74. 



No. 2880. 
















No. 2873 

(shown in use 

as part of No. 

10286). 



No. 2880 (t-hown with 
Nos. 2918 and 2922). 



No. 2884. 



No. 2886, 



No. 2888. 



2870. 
2873. 



CLAMP. Dish, Stoddard's, of brass white-plated, for holding evaporating and other dishes up 

to 4 ' j inches in diameter WJi 

CLAMP. Flask or Tube. Cenco friction type, as used on support Btaud No. 10286 for holding 
conductivity cells, small flasks, calomel electrodes, etc A flexible clamp for holding fragile or 
expensive glassware without tlang«'i of breakage through clamping too tightly. For use on a 

6 nun rod. Without support 1 -2«- 

10412. CLAMP. Rod, for use on No. 1"11" Aquarium Type DeKhotinsky Thermostat for clamping to its 
side flasks, conductivity cells, etc. Drilled to take a 6 mm rod. By means of No. 2919 Bight 
Angle Clamp, and a Bhort piece of 6 nun rod, No. 10286 support may be easily attached. A 

very convenient rrraiijii'inrnt is Bhown under No. L0238 2,5 ° 

2874. CLAMP, Test Tuba, of w I, improved form with steel spring -^ 2 

2880. CLAMP, Test Tube, Stoddard's, ,.f brass spi ing wire. Length, 4% inches - 12 

Note. — For a very convenient arrangement for supporting Stoddard's Test Tube Clamp, see Nos, 
2918-2922 on nexl page. 

CLAMP, Tubing, Cut-off, of brass, nickel plated. For tubing up to '•,,; inch. 10 r ; discount in 
lots of 12 each .70 



2ss_'B. 

2884. CLAMPS, Tubing, Mohr's Pinchcock, of spiing wire, nickel plated. 



No 



Total length, Miches .... 
For tubing up to, inches 
Each 



A 

2 \ _• 

•-■,., 
.12 



2886. 



-jsss. 



c 

'.. 
.18 

the 



MP, Tubing, Mohr's Pinchcock, of rectangular wire, giving a flat bearing surface on 
lino :: nun wide, insuring close i ontact and safeguarding the tubing. Made of stiff spring 



CLAMP 

tubing o nun wuif, insuring ciose contact ina safeguarding 

brass, whit i' plated, with Hat fino, r ..Mips. Length, l j i l . inches; for tubing up to % inch lo 

CLAMP, Tubing, Spring Pinchcock, Day's (Patented). Can be placed on or removed from rubber 
tubing without disconnecting apparatus. The most serviceable pinchcock made. Constructed 
of strong spring wire, white-plated. Length, 2% inches; for tubing up to % inch - lb 

Note.— 10' ; discount in lots of 12, 25% discount in lots of 144 from all prices on this page. 

132 



31 



& 



.. 


QUI 




an 












£ 




CLAI 




CLAH 












£ 




CLAK 




'U 
















E 


- 


CLUj 








E 


- - 


CLAJi 


- 


CUK 






Ill 


CLm 


. 


CLAS 




CUi 



:• •■ 






cla\ 



cum 
- base 

Kot t . 



3S»ftfir^£«<». 



CENTRAL SCIENTIFIC CO., CHICAGO. U. 8. 



A. 



CLAMPS 






No. 2914 




No. 2894 



No. 2890. No. 2890 (open) 




No. 2896. 




No. 2906. 



No. 



2917. 



2890. 



Nos. 2918, 2922 and 
2880 shown in use. 



8894. 

2H9b\ 



For tubing up to, inches 

Each . 

CLAMP, Tubing, Bunsen's Screw Compressor,' of br'asV nickel' ZaXX ' V ' . $ °' 2 ° ^ 

Size, % by p.. inches ' *J-l»lato«i, for heavy rubber tubing 

CLAMPS Tubing. Hofmann's improved 'form ; niikeiVliied'wiih'opin'iaw: 



combination of Hof- 

onneeting apparatus. 

A B 

%6 fc 



Hi-' 
.40 



2*»S. 



Por tubing up to, inches 

Each 



• » i t • • 



A 

'-_■ 
.20 



-gWTS StW4^«'ti^t« ;!-- — 



rlKI 



2900. 



2902. 
2906. 

2914. 

2916. 
2917. 



For tubes up to, inches 

Total length, ineaea :::::::::: :::::::::::::::::;::::; 

CLAMPS, Universal,' same as No." 2898/ with 'jaws* rubber' covered.' 

Each ' 



• •»••» 



A 
2 

8 
.60 

A 

.70 



B 

:i . 
.30 

nut 

B 

3 

10 
.80 



B 

.90 
.12 
at- 

.85 



-'!Uv 



2919. 
2920. 
2922, 



CLAMP M^STi °l l 7 aSS ' **?: P^'Ooi wai.'h glksaianp io*2% inches in diameter 

tSS f 8U pp^ h r°od 8 . !^? pp t rt .T! ?!?.T etera ; ""' """■ , " apparatU8 ' with — for 

"^arnefe^^ °. f iron with bra - ^" for Vast^ingelamps'to VuppoVt rods up to jfe inch 

CLAmI Hmn?p' SS £.2? -• ,1 ^ ^iti.'swili.i^nrattaci.h'.u'eiamps'at'iin^anui-:.;;; .70 
l rn- HOLDE *' Cenco friction t-pe, for use in holding .lamps No. 1*62, 2864, 2898, Rings No 
i '•-•-, or any other apparatus with a 10 mm attachment rod on a No. 13036B or 13038B Bun- 
port iui is an apphcation of a device first developed for laboratory use in our own shop, 
fi 11 n l, <lam l*. ls In ?t*"tly released by pressing its two ends together and take hold firmly when 
, n,, 1 ;,; C , IS reh t Ved I Without shifting its position. A time and trouble saving mechanism 

CLAMP wnrnr^'o 1111 ' 1 to shift its l" ,siti »" on the support rod 1.00 

Ft li " oljJ ? BR \ Stoddard's, an ingenious device for rigidlv holding Stoddard Wire Test Tube 

-li i a Ul aUy I' osltlon - Provides for vertical and horizontal adjustment to anv angle, 

ana wiu adapt itseli to a great many uses in the laboratory. Clamp holder with right angle 

rr^^^ thout Test Tube Holder or Base and Rod. ... ? 5 o 

CLAMP HOLDER only of No. 29 1 8 20 

BAq? T At^ G «^ CLAMP only Of No. 2918. Has one iL-ineh hole and one '/ 4 ineh hoie. .' .30 
, AJVD R0D f or use with No. 2918 as shown in illustration. Base is heavv, and stable oven 

Not, ££*S Ve l0ad i rod is 15r %2 iuchos " 60 

«ote— io /t , discount in lots of 12, 25% discount in lots of 144 from all prices on this page. 



1 f- , - 



I 



133 






WW 



CLAMPS 



CENTRAL s.'iKNTlKH « <>.. CHICAGO, U. & A 





No. F155 





I '■ 



No. 2940. 



No. F213. 



No. F211. 



No. F153 (in use) 



CLAMPS, GENERAL LABORATORY 

The damps listed in this section differ from the usual chemical laboratory clampa in that they are 
carefully machined to secure perfect alignment of apparatus with which they are used. All Y's are 
accurately milled, holes are carefully reamed and faces ;uv smoothly pinned. They should be selected 
whenever it is essential to have apparatus assembled with an aeeurate arrangement of parts. 

2930B. CLAMPS, Adjustable, stool. These damps are so constructed that they can be quickly adjusted 
and will lock themselves the moment the pressure Is applied to the screw. The bai is 3^4 inches 
from the center of screw, Maximum opening, 10 inches, A very desirable clamp foi light or 
medium work , •••.,«••••••••• S2.10 

F211. COLLARS, with sot screw, allowing a damped rod to rotate freelj . and at the same time prevent- 
ing motion along the axis. The two smaller sizes are of brass, nickel-plated; the others of 
iron, neatlv japanned. 

No * A B C D 

For rods of diameter, mm 10 13 19 30 

Each .70 .75 .50 180 

F213. HOOK COLLARS, with sot screw, of substantial construction. The many uses to which such a 
piece may be put will readily be seen. Th • two smaller sizes are of brass, nickel -plated; and 
the other of cast iron, neatlv japanned. 

No A B C 

For rods of diameter, mm 10 13 19 

Each 80 .90 .70 

F153. CLAMPS, Extension, for holding two rods parallel to each other. (The illustration shows the 
clamp in use with two rods and an iron table top.) 

N ° A B C 

For rods of diameter, mm 10 13 19 

Ea <* ...!!!!." 1 1 1 ] V.l] V.l .90 1.15 175 

2940. CLAMPS, Hand Screw, wood, with saw out threads on screws 

No B D 

Length of jaws, inches 7 10 

Opening, inches 3 514 

Each ;;;;;; ; ; ; ; ; ;;;;;;;;;;;;;;;;;; ; .70 100 

F155. CLAMP Extension, for holding two rods parallel to each other. By using this clamp it is pos- 
sible to fasten two rods parallel to each other without slipping the clamp over the end of the 
rods, as was necessary in the old form. For use with rods of from 10 to 19 mm diameter. 1.35 

134 



-;■ 



fill 



| CLAM 

KM 
K 

fa 
It 

J CLUD 

MM 

I CLUD 
bad 

X 

V 

H 
h 

" CLAM 

V, 
Ei 

Xotr- 

l CLASP 
I CLAM} 



Bo 



II 



: - 



CLAMpi 

s 











CE NTRAL SC IENTIFIC CO., CHICAGO, U. S. A. 



CLAMPS 





No. F177. 




No. F179. 



No. F163. 



No. F171. No. F165. No. F173A, 



No. 2974. 





AD1 


• 


ptrtL 


tor.* . 


.,, ci 




C 

19 
JO 


kd-pb! 



F163. CLAMP, Meter Stick. A convenient device for holding the- ordinary meter stick in position on 

a rod, , wit I. V ^opening for clamping it to any rod from 10 to 19 mm in diameter. The motor 

stick is held firmly in place parallel to the rod by a thumb screw S0.70 



F 16.-). 



CLAMPS. Parallel-Jawed, of brass, nickel plated, for holding square objects, mirrors, scales, 
screens, etc. Maximum opening of jaw, 4 < in. Bod 10 mm in diameter. 

No A B 

Rod, length, cm ^0 ..,, 



Each 



'J 80 



2.85 



F171. CLAMP, Right Angle, of brass, nickel-plated. To hold two 1" mm rods accurately at rii'lit ancles 

to each other B ~r- 

F173. CLAMP, Right Angle, of iron, neatly japanned. Sizes B and C have zero indicator for optical 
bench accessories. 

JJ°- ••:•••; A B C I) 

V opening for rods of diameter, mm l;; i«) ig 

Hole for rods of diameter, mm 10 13 6 1«) 

Eacn • 85 1.00 1.25 200 



B 

lit 
1.00 



P175. CLAMP, Right Angle, of iron, neatly japanned, with two V openings at right angles. 
No A 

"V openings for rods of diameter, mm 13 

Eac b 90 

Note: -Fur less expensive right angle clamps, see N«». 2914 Clamp Holder. 

F177. CLAMP, Right Angle. One 19 mm V opening. Tapped %-20 to receive 10 mm rod 1.00 

179. CLAMP, Right Angle, for lens holders, telescope supports, pulleys, etc., with zero indicator for 
photometer and optical bench accessories. Carefully made so that the rod will be held perpen- 
dicular to the V. The V opening is for rods 19 mm in diameter. 



penmg 

No j^ 

Hole for rods of diameter, mm 10 

1.00 



Each 



B 
13 
1.70 



F180. 



CLAMP, Right Angle, same as No. F179A, with addition of a spring so that it can be moved 
along the rod without loosening the set screw. Convenient for carrying photometer box. 2.75 

•*i OLAMPS, Standard, made of malleable iron, and provided with ball and socket swivel cap on screw. 

JJ° A B C 

Opening, inches 3 4 6 

Ea ch 45 .60 1.00 



!•:.- 






CLAMPS 



CENTBAL BCDBNTIFIC 00, <HI< LQ O, U. ». A. 









No. F197. 



No. F195. 



No. F185. 



1 







F1S3. 



F185. 



F1H7. 



F189, 



F191 



F195. 



F197, 



l'L'Hl 



w — " m& 

I 

No. F189. 

No. F183. 

7 ~^ T 

No. FIST. No. P201. ^^ 

CLAMP. Support, Bridge Form. For use with double rod optical bench or photometer, made up 
of Noi P303 Bud Supports and a pair of n* nun square rods, is easily i lamped to the rod by a 
slight movement of the handle Been in the illustration. Provided with an indei line or zero 
indicator in the same plane with the vertical bole, which is 10 mm in diametei S5.2o 

CLAMP, Support, Screw Adjustment. Por same usee ae No. F179 Right Angle Clamp, but de- 
signed to give a very fine adjustment in a plane perpendicular t«» the V. Provided with aero 
indicator. Range of adjusting screw, over 25 mm; V opening, 19 mm; bole, 10 mm,,, 6.50 

CLAMP, Swivel. Very useful for holding pulleys, mirrors and lens supports where different 
angular directions are desired. Two 19 mm V openings, which can be clamped at any angle 
to each other in parallel planes 1.80 

For less expensive CLAMP, with swivel, see No. i'i*l»i ('lamp Il<d<l< 

CLAMPS, T, for holding two round rods at right angles to each other in the same plane. 

No A B 

For rods of diameter, mm 13 ]9» 

Eac h ......].[........ 1.25 2.00 

CLAMP, Table, of iron, for a table top s em thick or less, with accurately milled V 9 * at right 
angles to each other. To be attached to the edge of the talde for holding 10 to L9 mm round 

or square rods, either horizontally or vertically. The broad tlan-e is earefullv milled and in- 
sures .stability. The T-Screw is BWiveled for protection of the table B 2.80 

1AMP, Tab! 
is danger o 
surface of 
19 nun rod 

CLAMP Table. Similar to No. P195, but without the wooden jaws. The flange at the top is broad 
so that injury to the table top is prevented. Tapped %-16 to receive 13 mm rod. . . . . -86 

The teles- 
case when 
ich may be 
The clamp is 
Support Rod for carrying a scale 4.00 

136 





id 



■f 






>'■ 



:, 






CENTRAL SCIENTIFIC CO, CHICAGO, L\ S. A. 



CLOCKS 




U 

l'.'BIB... 

J 



: 

■ 
IrniDrf^J 





rod- 

• • : 

■fjfl 






. cW> 



No. F203. 






CENTRAL 5CI.CQ. 




Vf> 



L 1 



-V 



/ 



No. 3000. 



No. 3002. 



No. 3004. 



F203. 



3000. 



3002. 



3004. 



lions. 



.- 



CLAMP, Stone's Tension, modified form, for use in experiments wheTe it is desired to maintain 
a strain on a wire or cord and enable an individual operator to readilv adjust the tension with- 
out the co-operation of a second person. 

This clamp is substantially made of cast iron and neatly finished. Will fit anv table or board 
7 centimeters thick or less. Wires, cords, etc., are securely clamped by an eccentric lever, as 
shown in the illustration \ mm §6.90 

CLOCK, Interval, for sounding an alarm at the expiration of any given interval of time from 20 
seconds to 12 hours. This clock has a number of special features not found in similar devices 
previously offered: 

(1) It is a reliable time keeping clock with the usual hour, minute and second hands. 

(2) It will produce either a soft "buzz*' or a loud ring. 

(3) It may be set to sound a steady or intermittent alarm as desired. 

(4) The interval desired, if less than one hour, is obtained by turning the knurled ring which carries 
the glass face until the proper figure coincides with the minute hand. When the minute hand has reached 
the white index hand at zero, the alarm will sound. 

(5) Intervals of more than one hour are obtained by setting the small hour alarm hand at the time 
desired as in any alarm clock, then turning the knurled ring until the white index hand is at the exact 
number of minutes beyond the hour. The switch knob is then moved from the "minute" to the "hour" 
position. 

(6) The alarm is instantly silenced by moving the switch knob to the "silent" position. 

As described above with directions for use 7.00 

Note; — For an Automatic Time Switch for disconnecting electrically operated apparatus at the 
expiration of any interval, see No. 13810. 

CLOCK, Laboratory. This is the best clock we can furnish, adapted to the needs of the average 
laboratory. It is an eight-day Waltham movement, weight-driven clock, and we guarantee it 
to be a reliable timekeeper. 

The dial is 12 inches in diameter with seconds divisions. It is provided with hour and minute 
hands and a full sweep seconds hand for timing laboratory experiments. 

The pendulum is full seconds length, and provided with an adjustable platinum contact. A 
mercury well of improved construction, adjustable from the outside of the case, is mounted in 
correct position. 

The clock is completely enclosed in a polished oak case, with glass front and glass covered open- 
ing in the sides opposite the works, and binding posts on the outside for attaching battery 

and sounder , , . , ♦ 165.00 

CLOCK, Laboratory. An eight-day clock with good movement, driven by two weights. The 
dial is 12 inches in diameter and the pendulum beats seconds. The clock is provided with mer- 
cury contact adjustable from the outside of the case, and with binding posts for electrical con- 

n<< tions. Complete in polished oak case with glass door 80.00 

CLOTH, Cotton, Turkey Red, used to show bleaching effect of chlorine. . . per yard .40 

137 









COLOR TUBES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 







■ . 



No. 3020. 



No. 3024. 



. 



No. 3026. 












3016. 
3017. 



3020. 
3021. 
3024. 



3026. 
3027. 
3028. 

3029. 
3030. 





No. 3029. No. 3030. 

COLOR COMPARISON TUBES 

COLOR COMPARISON TUBES. Eggertz, for the estimation of carbon ami manganese in steel by 
the colorhnetric method. 

Xo B 

Capacity, cc :'■<) 50 

Graduated in, cc ' io Ho 

Per set of two $2.50 2.70 

Per set of four 5.50 600 

COLOR COMPARISON TUBES, Julian's, Bame as No. 3016, but with benl ends to permit mixing 
of contents without using a Btopper. Tin- lower portion of the tube is ungraduated. 

No A B 

Graduated from, cc 5 to 30 10 to 50 

Graduated in, cc i 1(1 >,„ 

Per set of two 3.00 3.25 

Per set of four 6.60 7.00 

COLOR COMPARISON TUBES, Nessler, usual torn, for ammonia test, of dear colorless glass 
with polishr.l bottoms. 

Nc A B C 

Graduated at, CC, .-,,) 100 & 100 

Each 70 .90 100 

COLOR COMPARISON TUBES, Nessler, American Public Health Association Standard. Tall form 
of clear glass with polished bottoms. Graduations of sets agree within nun and are about 
L10 mm on 50 cc tube an.l 325 mm on the 100 CC tube from the bottom (See Standard Methods 
of Water Analysis for 1920, page 1(5 . In sets to agree 

NO A T> Q 

Graduated at, cc '.'•....'.'..'.'.'.'.'.'.'.'..'.'.'. 50 100 50 ft 100 

Eacn 70 1 00 1-20 

Per set of six ,'/'• 450 670 8 . 50 

Per set of twelve 9 50 uoo 18 . 70 

STAND for Nessler Tubes of wood, stained black, with white glass reflector set at angle to reflect 

light upward through tubes. For twelve tall torn, 50 cc tubes. Without tubes 3.25 

^fh^-.w n? e t,T'! , , h ,<,1,,r '"'"Panson tubes. Improved form, so constructed that the shadow 
of the edge of the box ,-annot be thrown ..„ the tubes; with blue and ground glass.... W-00 

138 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



COLORIMETERS 




fro mii 



Br— g 




No. 3036. 



* 



wgmnti 

30 

] 
J2JQ J 

5i0 a 

3.00 - 

6.60 "' 



B 

.90 



.1 



■ 

•I 

::1 



B 

100 

L00 

6.70 

14.00 

yt al «*■ 



3036. COLOR COMPARATOR, Cooledge, developed from the original design by Prof. L. H, Cooledge 
in co-operation with our technical department, for the convenient comparison of a series of 
unknowns with a graduated series of liquid color standards, as used in the colorimetric deter- 
mination of hydrogen ion concentrations with Clark and Lubs indicators. The arrangement of 
the standard and unknown tubes at the time of the comparison is the same as in the coin 
paratoi described by Hurwitz, Meyer and Ostenberg (Bulletin, Johns Hopkins Hospital, 1916, 
Vol. XXVII, page 16) with holes for the Walpole (Biochemistry Journal, 1910, Vol. V, page 
207) combination for use when dealing with turbid or highly colored solutions where color 
comparison is impossible without special equipment- The comparator consists essentially of 
two hardwood test tube racks, mounted in a track in a hardwood support block which con- 
tains the operating devices, the observation windows and openings for the Walpole combina- 
tion. The test tube racks are 24 inches long and contain 12 holes each % inch in diameter for 
holding test tubes containing the standard and unknown liquids. As the rear rack is used 
for the standards, it has a cord arrangement with which it may be rapidly moved to locate the 
correct standard. The front rack holds the unknowns, which are moved the distance of only 
one tube each observation by means of a hardwood knob. The racks are provided with a catch 
system so that the tubes are always brought exactly opposite their proper observation win- 
dows. The Comparator may be directly illuminated by an electric lamp at the rear of the 
device, or by light reflected from a white object appropriately placed. Complete as described, 
without tubes or reagents $10.00 

H-ION INDICATORS, Clark and Lubs, suggested for colorimetric determinations of hydrogen 
ion concentration as the result of an extensive series of comparisons between colorimetric and 
elect rometric measurements, made for the most part upon solutions of interest to bacteriolo- 
gists. This series is made up largely of the brilliant and more reliable sulfon phthaleins, but 
contains the still indispensable, but not very stable methyl red. In the course of their inves- 
tigations, Clark and Lubs found Ortho Cresol Phthalein as reliable as Phenol Phthalein and 
more brilliant, with a color better adapted to titrations in artificial light. Brom Cresol 
Purple covers practically the same range as Litmus, but is more brilliant and reliable. The 
indicators of this series are relatively unaffected by conditions other than hydrogen ion con- 
centration, such as the presence of salt and protein. For the preparation of stock solutions 
from these dry powders, dissolve 1/10 gram of the dry powder by grinding in an agate mortar 
with the indicated quantity of N/20 NaOH. When the solution is complete, dilute to 25 cc. 
When made up in this manner, there is obtained in each case a 0.4 per cent, solution of the 
dye. For use in testing 10 cc quantities of unknown, five drops of indicator should be used. 
In this case Thymol Blue, Brom Thymol Blue, Brom Phenol Blue and Brom Cresol Purple 
should be diluted to 0.04 per cent/solution and Cresol Red, Phenol Red and Methyl Red to 
0.02 per cent, solution. Ortho Cresol Phthalein and Phenol Phthalein are used in a 0.02 per cent, 
solution in 95 per cent, alcohol. (See The Determination of Hydrogen Ions, W. Mansfield 
Clark, 1920.) 





P H 


Indicator 


Range 


Thymol Blue (Acid) . 


1.2-2.8 


Brom Phenol Blue . . 


2.8-4.6 


Methyl Red 


4.4-6.0 


Brom Cresol Purple. 


5.2-6.8 


Brom Thymol Blue . . 


6.0-7.6 


Phenol Red 


6.8-8.4 


Cresol Red 


7.2-8.8 


Thymol Blue (Alk) . . 


8.0-9.6 


Phenol Phthalein . . . 


8.4-9.2 


Cresol Phthalein 


8.2-9.2 



Molecular cc N/20 NaOH Per 

Weight per 1 10 gm 1 /10 gm bottle 



466.30 
669.82 
269.12 
540.01 
642.12 
354.17 
382.17 
466.30 
318.22 
348.27 



4.3 
3.0 
7.4 
3.7 
3.2 
5.7 
r..;; 

4.3 



* * 



.30 
.30 
.30 
.30 
.30 
.30 
.30 
.30 
.25 
.30 



Per 
gm bottle 
2.00 

2.00 

.60 
2.00 
2.00 
2.00 
2.00 
2.00 

.50 
1.50 



SODIUM HYDROXIDE SOLUTION, N/20 NaOH, for use in preparing solu- 
tions of Clark and Lubs indicators, in sealed, glass stoppered bottles. 
Per 500 cc e. s. b *•*■? 



Per 1000 



cc 
cc 



g 
g 




139 



COLORIMETERS 



CENTRAL WIKNTIKIC m, CHICAGO, V. S. A 



| 
J 























:\o:\s. 



No. 3038. 



No. 3039. 



STANDARDIZED BUFFER SOLUTIONS, CUrk and Lubs, One-fifth Molar (M 5) Solution- For 
colorimetric comparisons of hydrogen ion concentration! the standards, against which the uu- 
knowns are compared, must be of such well defined compositions that they can be accurately 
reproduced, and with pH values accurately defined by hydrogen electrode measurements. These 
solutions are 'ailed buffer solutions ami generally consist <-i mixtures of some arid and its 
alkali salt. Clark and Lubs have selected a set of standards which they believe to be some- 
what more convenient than any previously selected series. A full discussion of these mix- 
tures, the methods used in determining their pll values and the potential measurements is to 
be found in the original paper (See Journal of Biological Chemistry, 1916, Vol. XXV, No. 3, 

page 479.) The following buffer solutions are Supplied in sterile, sealed, gla-^ stoppered 
bottles. 



Solution 

Potassium Chloride 

Acid Putasaium Phthalate 

Acid Potassium Phosphate.... 
Boric Acid Potassium Chloride 
Sodium Hydroxide (CO-» fre 
II vdrochloric Acid ....."...... 

Boric Acid 

Disodium Phosphate 



For Mixtures 
of pH range 

i ■> .» .. 

■ . — — ._ 

2.2-6.2 
5.8 B.0 

7.8-10.0 



Per 500 cc 


Per 1000 cc 


g. s. bottle 


g.s. bottle 


$3.75 


5.25 


4.20 


5.75 


3.80 


5.40 


4.00 


5.50 


4.00 


5.00 


3.25 


4.50 


3.25 


4.50 


3.75 


5.25 



COLORIMETER, Biological, designed to meet the demand for a high grade colorimeter of the 

'I', "t P^ The optical principle is the sain,, an in the standard 
si™ and f • . Z f \ plung 5" are ma,le of M ' lected °P ticaI &™ ** Kgh light traiwmia- 

surfaces ifaraiw %T 1 "* are •****& ground and polished, with top 8 and hottom 

cup for the ^nd J ?5 aVe pla "" ■ ,,!lrallel ,,ottoms whirh are removable. The left hand 
cup tor the standard solution is moved up and dow 



3039, 




wi 



lirh can hi» moiei.ro^ ;,. *r\ . , . . • "'•"" "» i/iu mm. 1 no nirixi 

theut case meaSUred 1S 40 mm ' Colorimeter, as described complete with light shield, hut 

60.00 

COLORIMETER, Bock-Benedict a 

ro 

ta: 

capauie or oeing 
may be placed ei 
layer of standard 
made accurately 

-— ».„ MU1V <1S - CM' Of nnl/..-.-..- t»_ ■ - - 

mag 

140 



^^^^fS^t K Simp, ° in T Umont for ™<lical work employing a pair of mir- 

.ngular glass cell between tL^"*"^ ^ Stam,ard oolor solution " is 9"* in a reC - 
.pable of bein I ed Zlt^XT' Z M ' thp « n ^own is placed in a Vvlindrical eup 





i 5) sotea h\ 

Uttt ltd tkt 

' (u be wmtfl 

•oae adniil 
Mievetok<» 
«ioi or lk»E 
■MSUtMIUi ■ 

n 

■d, glttS JtJfirt 



CC 



hi 

ni 

a 

y 
a 
y 

ti 






I)|IUW>»- * 

, io the- ** 

- 

: 

I 

, trltfi 



OBNTBAL SCIENTIFIC CO., CHICAGO. U. S. A. 



COLORIMETERS 





No, 3040. 



No. 3044. 



3039A. 
3039B. 
3039C. 
3039D. 

3040. 



3041. 
3042. 

3044. 



364-3. 



COLORIMETER, Bock-Benedict, Continued. 

mounted ou the movable cup support readings may be made to 1/10 mm. (See Journal of 
Biological Chemistry, Vol. XXV, No. 2, for August, 1918, page 227.) Complete instrument 
with plunger, one cylindrical cup for unknown and one 15 by 10 mm cell for the standard, with 

directions for use $40.00 

Cell, for No. 3039, rectangular glass for standard, 8 by 10 mm 2.30 

Cell, for No. 3039, rectangular glass for standard, 15 by 20 mm 2.30 

Cup, for No. 3039, cylindrical glass for unknown 1.15 

Plunger, for No. 3039, cylindrical glass 1.15 

COLORIMETER, Campbell-Hurley, for all types of colorimetric comparisons where at least 100 cc 
of unknown is available. Especially useful in steel, water, oil, paint and varnish and general 
analytical laboratories, replacing the less accurate comparison cameras. A system of mirrors 
juxtaposes the fields of the unknown and standard, which appear, through the telescope, as 
a single field divided by a hair line- The shade of the right hand half of the field is that of 
the standard solution and is easily varied by manipulating the glass plunger in the reservoir 
attached to one tube. Complete as illustrated with standard cylinder graduated to 100 cc in 
1 cc divisions, and with cylinder for unknown graduated to 100 cc in 10 cc divisions. (See 
Journal of the American Chemical Society, Vol. XXXIV, No. 7, for July, 1912) 28.00 

Graduated Cylinder, only, for No. 3040, for unknown solution 1.50 

Graduated Cylinder, only, for No. 3040, with attached reservoir and glass plunger, for standard 
solution 6-00 

COLORIMETER, Duboscq, Bausch and Lomb, improved design, for measuring the intensity 
of the coloration of any liquid, through which light may be transmitted, by direct 
comparison with a standard liquid. In the industries it finds widespread application in 
Bach work as the determination of titanium, manganese, carbon in steel, aluminum, bismuth, 
antimony, chromium, flourine, copper, gold and many other substances. Since the work of 
Dr. Otto Folin on the determination of total nitrogen, non-protein nitrogen, urea, uric acid, 
creatine, creatinine, etc., in blood and urine, this type of colorimeter has become the standard 
for biological and medical use. The optical system, which is the essential part of the instru- 
ment, is of the highest quality, being made of the best optical glass of neutral tint, accu- 
rately ground and polished. The bottoms of the cups and the plunger ends are piano-parallel, 
permitting the two beams of light reflected from the mirror to pass through them and the 
Squid into the coincidence prism, without modification. The frame and base is made of heavy 
castings, so constructed as to provide for stability and permanent alignment of the optics. 
Both cups are raised and lowered by means of racks-and -pinions of precision type. Readings 
are made to 1/10 mm from the engraved millimeter scale on the back by means of verniers. 
Complete as described, in polished hardwood case, with directions and four pair of matched 
ray filters to permit modification in tint of liquids to be studied. 
No. A B 

Height of cups, cm -' ^ 

Each 125.00 165.00 

Cups, glass, complete for No. 3044 colorimeters. 

No 

Height, cm 

Each 



A 


B 


5 


10 


5.50 


8.00 



I 






iw 



iier 



141 



COLORIMETERS 



CENTRAL SCIENTIFIC CO., CHICAGO, P. ft A, 





No. 3046. 



No. 3047. 






304(3 










3047 



NEPHELOMETER ATTACHMENT, for use with No. 3044 Colorimeter in making quantitati 
determinations of substances in liquids by estimating the translueency possessed by certain 
concentrations when a cloudiness exists or can be brought about. The attachment consist* 
of a 250 watt mazda lamp mounted in the focus of a pair of condent >rs, which project a beam 
of parallel rays o£ light horizontally into vials containing the liquid under examination; and 
which arc inserted in the place of the glass plungers on the huboscij colorimeter. Two tabu- 
lar metal light shields replace the cups *»n the colorimeter and are raised and lowered by the 
rack ami j»i nion in the same manner as the cups, thus screening ami exposing definite depths 
of the liquid under examination to the light rays The brightm sa «»f the field, judged through 
the observing microM-opc on the colorimeter, depends on the number of particles in suspension 
in the li«|ui.|. so that <juant itative determinations of turbidity are obtained by matching the 
field of the unknown against the field of the standard. 

No. A B 

Height of vials, cm , , , 5 p> 

Each , $75.00 90.00 

COLORIMETER, Duboscq, Original French, made in the factory of the successors of Jules 
Duboscq, who in 1854 first devised tins typo of colorimeter, this instrument is essentially 
the sain, as the No. 3044 Duboscq Colorimeter varying only Ln small mechanical details. It is 
used in exactly the same manner. Complete, with four pair <»t tinted ray filters and one pair 

ut ground glasses. 

No. ^ B 

Height of cups, cm 5 yj 

Eacl1 92.00 149.00 

iiu4». COLORIMETER, Dunning, for csti 

m=^ — mating the quantity of phenol- 

sulphone-phthalcdn excreted when 

applying the Bountree(ierahty 

renal functional test. Com- 

_73~ plete with colorimeter box, empty 

ampoule, and 13 calibrated test 
ampoules varying in color, in pol- 
ished wooden box, 2% by m b. v 
5 inches. (See Journal of Phar- 
macology and Experimental Thera- 
peutics, Vol. I, No. 6, for July. 
f^M 1 W$ fc*jk » <gr^ lid*, pajje r»7D; also the Journal of 

B/l rsjf _M^. ^ ^T^Wfw ] t ' u ' American Medical Association, 

3049. PHENOL-SULPHONE-PHTHALEIN 




AMPOULES, for 



W^t 



a *J 



with No 



3048, containing sterile, biologic- 
ally standardized solution of the 
mono-sodium salt, with strength of 
8 nig to each ce; in box of 10 
ampoules per box 1-25 



142 




-." 



— 

: 

1; 

u 



.;- Udttp 

1*1 

• "■ sat 

•ter t»'i. ** 
calibrate * 

ria*BttHJJ 

the J**' 
. • .. 

:erik- **£. 

il 

par** 



CENTRAL SCIENTIFIC CO., CHTHAnn u. S. A. COLORIMETERS 




No. 3052. 




3052. 



No. 3U80. 



COLORIMETER Kuttner s Micro, for directly estimating haemoglobin and sugar is the blood; 
urxc acid, creatine, and creatinine in blood and urine; and for determining the renal function 
according to the method of Bowntree and Gerahty. The instrument consists of a closed Up- 
right box, 2.5 X 2.5 X 8.5 cm, with openings for the graduated ;.ud the standard color tul.es. 
The tubes are viewed through a window, in the front, provided with a Jlel.nl.olt/. double p! it. 
wimn shows the colors in a continuous band, rendering the comparison very exact. A sliding 
door forms the front of the box and affords protection to the prism. The size of the outfit 
enables it to be earned in the pocket. Complete with housing of hard rubber, with Helmholtz 



double prism and sliding door; one each pipettes 25 cmin, 0.1 cc, 0.2 CC. and 2 cc; two graduated 




] $22.00 

STANDARD COLOR SOLUTION TUBES FOR USE WITH KUTTNER MICRO-COLORIMETER 

TESTED AND APPROVED BY DR. KUTTNER. 
3068. Haemoglobin Test Standard Tube, equivalent to 15 grams haemoglobin 



or 20 cc oxygen (0 2 ) 



3069. 

307H. 



2.25 



Carbonyl Haemoglobin Standard Tube, equivalent to 20 per cent, oxygen (0 2 ) 6 0O 

Sugar Test Standard Tubes, a set of two, A and B, the former being equivalent to 6.1 per cent, 
of sugar, the latter having twice that concentration. 



No. 



3071. 



B 
1.50 

in 



3072. 



Per tube 150 

Phenol Sulphone-Phthalein Test Standard Tubes," a 'set' of three', the" No. 1 tube reading directly i 
percentage, the Nos. 2 and 3 tubes being weaker in the proportions 2 and 4. 

No j 2 3 

Per tube 1.50 1 50 l 50 

Uric Acid Test Standard Tubes, for determining uric acid' in blood, a set of two, A and B, the 
former being equivalent to 0.01 mg and the latter to 0.005 me. 



No. 



307.5. 
3074. 



B 

1.50 



Per tube 150 

Uric Acid Test Standard Tube, for determining uric acid in urine and stone, equivalent to 

0.02 U12 , „r- 



■s 



1.75 



3075. 



Creatine and Creatinine Test Standard Tubes, for urine, a set of two, A and B, the for 
equivalent to 0.01 me, the latter to 0.02 mg. 

No v B 

Per tube \\\ lm ' 50 150 

Creatinine Test Standard Tubes, for blood, a set of two, A and B, the former equivalent to 
0.01 mg, the latter to 0.02 me. 



::o.so. 



No, 

Per tube \ 1.50 



3080A. 
3080B. 



B 

1.50 
COLORIMETER, Meyers, a simple and inexpensive dilution colorimeter for clinical purposes 
siieg.-ste.l by Prof. Vietor C. Myers of the New York Post Graduate Medical School, for the 
■ linie&l estimation of urea, uric acid, creatine, creatinine and blood sugar; for the renal function 
test, etc. Consists of two glass tubes of identical bore (1.2 x 26 cm) graduated in tenths from .1 
to 25 cc, placed in a black lacquered, brass holder, which holds the tubes firmly in the correct 
position for matching colors, between the 1 x 2 cm observation window and the white glass* 
background. A dilution pipette is supplied for diluting the unknown until it matches the 
tandard. The most satisfactory results are obtained by using a known amount of the sub- 
stance to be determined in solution as a standard and treating both solutions in the same man- 
ner. The calculations with this instrument are verv simple. (See the Journal of Laboratory 

and Clinical Medicine, Vol. 1, No. 10, for July, 1916, page 760) 12 00 

Graduated Tubes, for No. 3080 per pair 3 20 

Pipette, for No. 3080 ''.75 

143 



> 



„ L , XTa , DAl cri)-'\'Tiri' CO., CHICAGO, U. 8. A 
COLORIMETERS il-NTR AL St Ift.Mir iv, w, 









No. 3093. 



No. 309-L 



No. 3097. 



X 









3093. COLORIMETER, Saybolt Universal Chromometer, adopted a* the Standard instrument by the 
V. s. Government and the National Petroleum Association Cor determining the color shades of 
refined petroleum. The instrument consists essentially of two removable glass color compari- 
son tubes, one being arranged for the insertion i»f the standard yellow glass disks in the bottom, 
the otlHT* ln-inij graduated in inches and having ■ brass dran off cock in the bottom to sdji 
the height of the oil column. The graduated tube is divided by eighth inches up to 20 inches. 
En addition to the comparison tubes, the instrument is furnished with a prismatic eye-piece 
which l. rings into single eye virion a Geld with one half illuminated by light reflected through 
the plain tube containing the yellow glass standard, ami the other half illuminated by light 
reflected through the column of «'il under examination in the graduated tube. To make the 
comparison, one of the standard glasses is inserted in the plain tube for oils with a color 
shade of from -|-25 to +16, and both of the glasses for oils of from +15 to — 9, and the oil 
slowly drawn off until the Held viewed through the eyepiece is of a uniform color. The color 
Bhade value is then found in the table which accompanies the instrument for the corresponding 
height of the oil column. Zero color shade is equivalent to "standard white"' and +21 color 
shade to "water white." ( See Bulletin No. 5 of the U. S. Govei unieut Committee On Stand- 
ardization of Petroleum Specifications.) Complete with two Standard color glasses, COloi table 
ami direction card, in wooden carrying case S80.00 

Standard Color Glasses, for No. 3093 each 15.00 

COLORIMETER, Schxeiner's, as used in the Laboratory of the Bureau of Soils, United States 
Department of Agriculture. The Colorimeter COnsist8 essentially Of tWO g r a • 1 u a t e. ] glass tubes 
which contain the standard and the unknown eolorimetric solutions, with two smaller glass 
immersion tubes, by means of which the length of the column of liquid in the graduated tubes 
may be changed. Complete with graduated and plain tubes. (For full description Bee Jour- 
nal of the American Chemical Society, Volume XXVII, September 9, 1905. ami Bulletin No. 31, 
United States Department of Agriculture, Bureau of Soils) 30.00 

Tubes, Graduated, for No. 3094, with 100 scale divisions, 2mm apart per pair 4.00 

Tubes, Immersion, for No. 3094, 26 cm long with polished bottoms per pair 1.25 

COLORIMETER, Tag-Robinson, for determining the color shades of lubricating nils. This in- 
strument is of the same general type as the Saybolt Universal Chromometer. except that, as 



3093A 
305)4. 



3095. 
3096. 
3097. 



the 
is 



tie depth of the oil under test need not be varied through so great a distance, the variation 
s accomplished by an immersion tube, which is raised and lowered bv means of B rack-and- 
piuion device. The readings are made on the face of the instrument opposite the index, which 
indicates the depth of oil necessary to match the color shade of the standard color glass 
screwed into the color standard plunger. The three standard color glasses which are provided 
represent the true colors of the oil, ami with them the complete range of color shades for 
lubricating oils is secured, including all of the National Petroleum association colors. Com- 
pete as described with three standard color -lasses mounted to screw into the color standard 
plunger, color table and direction card, in wooden carrying case 100.00 



3097A. Standard Color Glasses, mounted to 

No 

Each 



carrying 
screw into color standard plunger of No. 8097. 

1 2 

12.50 12.50 



3 

12.50 



144 



CENTRAL SCIENTIFIC CO., CHICAGO, IT. S. A 



COLORIMETERS 



I 





No. 3097. 

w«lrj| 

• --• ::;••■ - 
-bottgttoUji 

lanuiutfd bj £ 

'. : • 

to— 9. aitki 

i tolor. TV* 

id-: 

■ um,( . tin 

«l| 

«d SI 

• ' 

■ 

id Boll*tis S • 

in* oils ' 

tion <**J5 

..■•■■■'" 



50 




No. 3105. 

COLORIMETERS, LOVIBOND TINTOMETERS 

3105. TINTOMETER, Lovibond, Observation Instrument only, of improved form, combined monocular 
and binocular, suitable for all general work such as the measurement of the color of liquids or 
BoUds. The instrument is leather covered and is supplied on an adjustable stand which is re- 
quired for work with solids. Observation instrument only, with stand but without trays, 
pressing block for solids, troughs for liquid or color glasses $28^00 

31 0.1 A. TRAYS, into which powdered material may be pressed to enable color measurements to be made 
per doz. 2.70 

3105B. PRESSER, for pressing powdered material into the trays so that they may offer a uniform sur- 
face upon which color measurements may be made 1.60 

3105C. STANDARD COLOR GLASSES. These glasses are furnished in the three dominant colors of the 
spectrum, red, yellow and blue, for general work. For each of these colors there are a series 
of 155 shades of color, graduated from .01 to 20.0 tint units. There are 465 color glasses in 
all in these three colors. The tint units are derived from the wave length values of the dif- 
fraction spectrum which lie between A760400 and H396319. This range is divided into 100 
parts which are the tint units. Each tint unit, therefore, covers a range of 3640 wave lengths. 
For colorimetric testing of specific substances, arhitary eolor ranges have bem chosen which 
are not pure color tints. These are merely known as color glasses of a numbered series as 
for example the "50 Brown" and "52 Brown p ' series, the ''500 Amber 1 series for refined 
oils, etc. 

To reproduce the National Petroleum Association colors, when examining oils contained in 
the standard 4-ounce oil sample bottle, Lovibond color glasses must be used as follows: 



N. P. A No, 



Lovibond Glasses - 



200 Red Series 

510 Yellow Series. 
1180 Blue Series 



3 3.5 


4 


4.5 


5 


6 


6.9 7.8 


14.00 


21.00 


35.00 


60.00 


32.0 39.0 


50.00 


35.00 


93.00 


60.00 


* • • • III! 


.55 


.55 


■ • • ■ 


.55 










2.00 



p 



Single color glasses, any series or number, as described 
Note: — In ordering, specify color series and number. 

3105D. STANDARD WHITE, for obtaining a pure white back ground for matching colors of solids with 
Lovibond color glasses, in 4 ounce bottles. . per bottle .45 

3105E. METAL TROUGHS, silver plated, accurately gaged, with parallel plate glass ends, to hold 
liquids whose color is to be matched with Lovibond color glasses. 

Length, inches 1/16 * ,H 

Each .! 7 - 20 72 ° 1800 

3106. TINTOMETER SET, Lovibond, for Flour. A valuable equipment for milling laboratories for 
standardizing the qualitv of flour by its color, and for detecting bad milling and blending 
wheats for flour. A fair index of the gluten and starch content may be obtained from the 
color values. The set consists of one improved observation instrument, six trays, one P res ser, 
one bottle of standard white and 54 standard color glasses as follows: 14 glasses series L00 
27 glasses series 510, 10 glasses series 1180 and 3 colorless glasses. Complete as described lib.oo 

145 



I 



I 



COLORIMETERS 



CBNTBAL BCTENTIFIO CO., rniCAfiO. U. 8. A 








No. 3107. 



No. 3109. 



1 



\ 






I 



3107. TINTOMETER SET, Lovibond, for Standardizing Merchantable Petroleum. This set has h<>en 
the standard of petroleum refineries for many y. :n- for gasoline and hurning oiU a- it offers a 
very simple means of grading these products. Consists of one tnonoculai observation instru- 
ment; our is inch silvered metal trough with glass ends; one reflector; 1 special standard 
uMass s for water white, standard white, superfine white and prime white oils; and a hardwood 
ease, constructed to open up in the form of a stand which, when placed on a table of ordinary 
height, will bring the eye piece of the observation instrument in line with the i pe« Complete 
as described $72.00 

:UOs. TINTOMETER SET. Lovibond, for Merchantable Petroleums. Intermediate, Russian and Lubri- 
cating Oils. Refineries producing lubricating oils in addition to gasoline and burning oils are 
able to make color determinations on their entire line with this enlarged equipment. Consists 
of one monocular observation instrument; one 18 inch and one i ,, ; inch silvered metal troughs 
with tflus** ends; one reflector; nine standard color glasses for water white, standard white, su- 
perfine white, prime white, 1.5, 3, 4, 5, and 7; and a hardwood case as furnished with No. 
3107. Complete as described 96.00 

8109. TINTOMETER SET, Lovibond, Wesson Type, for Cotton Seed Oil. This S e1 is especially de- 
signed for the rapid grading of cotton seed Oils by means of tin* Lovibond standard color 
glasses. The metallic observation instrument is mounted on a tripod. With it sample- of oil 
are measured in <» x % inch glass tubes instead of in the 4 ounce oil sample bottle as formerly. 
The eentera of the colored fields are only % inch apart instead of 1% inches. A set of 27 
standard color glasses are supplied with the instrument, as follows: One each Red 0.1, .2, .3, 
.4, .5, .6, .7, .8, .9, 1, 2, 3, 4. 5, 6, 7, 8, 9 and 10; and one each yellow 1, 2, 4, 6, \ 1", 20 and 35. 
Three jrlass tubes are furnished for containing the oil under test. Complete a> described 62.50 

3110. TINTOMETER SET, Lovibond, Wesson Type, for classifying Cotton Seed Oils above or below 
Prime Color. I insists of the observation instrument/ with three glass twins a < described 
under X... 3109 but one only compound sta inlard color glass (Red 7.1 and Yellow 35.0) instead 
of the U7 glasses listed under Xo. 3109. Complete as described 1650 

3110A. OIL jruJusS* Glass, 6 by % inches, as supplied with Wesson Type Tintometer each .60 

TEXT BOOKS ON THE TINTOMETERS. 

EJ™ "J^TTSi 01 'if ' "* °° i0m Sensatl0ns '' ' by Joseph W. Lovibond 3.25 

3111B. Light and Colour Theories. 1 ' by Joseph W. Lovibond 3.25 

146 






f'KNTRAL SriKXTIFir- ,T»., CHICAGO. O. 9 A 



COLORIMETERS 





No. 3112, 3112A, B and C. 



No. 8705. 



3112. COLORIMETER, Universal, after Autenrieth and. Koenigsberger. consisting of a hardwood case, 
the front and back of which arc in the form of removable slides. The back is fitted with a 
ground glass window through which both the glass trough containing the liquid under examina- 
tion and the glass wedge containing the standard color solution are illuminated, a celluloid 
millimeter scale from which the readings are made, and an adjustable (lamp for holding the 
glass wedge. The back is moved up and down by means of a raek-and-pinion. The front slide 
is fitted with a slit plate which forms the observation window, and a Helmholtz double plate 
which juxtaposes the fields of the unknown and standard. These two fields appear as a con- 
tinuous field with a hair line separating the two parts. This arrangement enables the most in- 
experienced operator to match the colors accurately. The glass trough for the liquid under ex- 
amination is held in a easily removable metal slide fitting on the inside of the left hand wall of 
the colorimeter. A complete description of the methods for using this colorimeter, together 
with directions for making the standard color solutions will be found in "The Newer Methods 
of Blood and Urine Chemistry" by Gradwohl and Blaivas. Colorimeter complete as described, 
without glass wedge or trough $35.00 

3112A. Glass Trough, to contain the liquid under examination 4.00 

31 12B. Glass Wedge, with ground glass stopper, to contain liquid color standards prepared in the labor- 
atorv 8.50 

31 12C. Pipette, graduated 20 emm and 2 cc, with rubber tubing and mouth piece 1.50 

8705. COLORIMETER LAMP, Chalet Form, a powerful light source of daylight quality for eolori- 

metric determinations following the design suggested by Prof. Simon H. Gage of Cornell Uni 
versity, with the modifications suggested by Dr. H. ft. Newcomer of Pennslyvania Hospital, 
Philadelphia. (See Journal of Biological Chemistry, Vol. XXXVII, No. 3, for March 1919.) 
The illuminant is a 100 watt, 110 volt mazda lamp in a light tight housing, with projecting 
eavea to shade the eyes of the worker, and with a window equipped with Corning Davlite 
glass, 82 x 82 mm, giving an almost pure white light. The spherical mirror of strong curvature 
reflects the light from the bulb which is earned in an adjustable plate for focusing and cen- 
tering the filament with reference to the mirror reflector. Complete as described, with cord, 
Witch and plug for 110 volt circuit 19.50 

8706. Lamp Bulb, 100 watt, 110 volt mazda bulb, for replacement in No. 8705 2.00 

8707. Resistance, for use with No. 8705 on 220 volt circuit 8.00 

147 



COMBUSTION 



CENTRAL SCIENTIFIC CO., CHI CAGO, V. S. A 








1 










No. 3115. 



COMBUSTION APPARATUS 




oxygen tank, regulating valve and pressure gage. 

flee "Standard Methods of Chemical Analysis," by Scott: and "Rapid Determination of 



3115. 
3116. 



Carbon in Iron and Steel," to The Iron Age for January, 19H, and January, 1914 | 

A 
110 

$54.50 

65.50 



Xo 

For VOltS 

Each without iheostat 
Each with rheostat. . . 



COMBUSTION APPARATUS. Fleming, same as No. 3115, but with Multiple Unit Electric < 

liustimi Furnace No. 6226. 



3117. 
3118. 



3119A 
3119B. 

2300. 

3119C. 

3184 F. 

3119E. 

3119F. 

3119G. 

114. 
3119H, 
3120. 



Xo ■ 

For volts 

Each without :heostat 

Each with rheostat 

Parts for Fleming Combustion Apparatus 



A 
110 

54.50 
64.50 



B 

220 

54.50 
64.50 



Mercury Pressure Gage (K), for the detection of leaks ami stoppages 2.00 

Washing Bottles (P and Ph, for caustic potash solution, two required each 2.00 

Calcium Chloride Jar (T), 12 inch size 1-40 

Mercury Valve (G), to prevent reverse action and to absorb sulphur from rubber tubing. 90 

Silica Tube (S), 30 inches long, % inch inside diameter 7.75 

Zinc Jar | 7. ) for 20 mesh zinc, to absorb acid, lead, sulphur and chlorine fumes 1-00 

Stop-Cock (C), used when it La not desirable to pass gases thru jars Z and O 2.00 

Phosphorus Anhydride Jar (O), to absorb water 3.00 

Fleming Absorption Tube | W ) 5.00 

Glass Tubing Connections, consisting of six pir< < - per set 1.30 

COMBUSTION APPARATUS. C. M. Johnson's, for the determination of carbon in iron, steel, 
ferro-alloys, etc. Complete as illustrated with Hoskuis Electric CombustUfn Furnace, mercury 
pressure gage, drying jar for solid absorbents, safety jar for potassium hydroxide solution, 
calcium chloride and soda lime jars, mercury valve, fused silica eomimstion tub.-, jar for gran- 
ular zinc, jar for phosphorus pentuxide, absorption tube for carbon dioxide, and connections. 
(See "Rapid Methods for the Chemical Analysis of Special Steels. Steel Making Alloys, and 
Graphite," by C. M. Johnson.) 

No 



With furnace and rheostat for, volts 
Each 



A 


B 


110 


! 


53.75 


53.75 



3122. 



COMBUSTION APPARATUS, C. M. Johnson's, same as No. 3120, but with Multiple Quit Elee- 
trie Combustion Furnace No. 6226, 



No. 



With furnace and rheostat for, volts \ 



Each 



10 

52.75 



B 

220 
52.75 



ti 



m of 


C31 




1 


B 




220 


-__ 


54.50 




65.50 








148 




£ f w dttei, 
«« it »u^ 

Mtion & 
A 

££ ■ 



I'm? EW-r. 



A 
lift 



-I 

H 



■ 

-•I 



■ 



", 



J 
1 



pc* 



* i 

no g 

.75 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



COMBUSTION 




B 

220 

26.00 
37.00 



Nos. 3120-2. 

Parts for Johnson's Combustion Apparatus. 
Hoskin's Electric Combustion Furnaces. 

No j^ 

For volts 110 

6210. Furnace only S26 00 

6211. Furnace with rheostat 37.00 

Multiple Unit Electric Combustion Furnace, tor use oa either 110 or 220 volts. 

6226. Furnace only 26.00 

6227. Furnace with rheostat (voltage must be specified) 36.00 

3184B. Combustion Tube, of opaque fused silica for Nos. 3120 and 3122, 24 inches long and % inch inside 
diameter 5.00 

3123. Mercury Pressure Gage, (A) to indicate leakage of joints or stoppage of flow 1.10 

3124. Jar for Solid Absorbent, (B; such as> potassium hydroxide sticks 1.40 

3123. Safety Jar, (C) for potassium hydroxide solution 1.40 

3126. Calcium Chloride Jar, (D) 1.40 

3127. Soda Lime Jar, (E; 1.40 

3119C. Mercury Valve, (F) to prevent back flow , 90 

3129. Jar for Granular Zinc, (H) to absorb acid, lead, sulphur, and chlorine vapors .80 

3130. Jar for Phosphorus Pentoxide, (I) to absorb water 60 

3131. Absocbtion and Weighing Apparatus for Carbon Dioxide, (J), to be weighed for calculating per- 

centage of carbon 2.30 

3132. Absorption Tube only of No. 3131, for potassium hydroxide solution 1.80 

Combustion Tube, Clay, C, M. Johnson's, see No. 3178. 

3134. MILLING MACHINE, C. M. Johnson's, for obtain- 
ing iron and steel samples for use in combustion 
apparatus. Especially useful for obtaining sam- 
ples from wire and sheet metal. This machine 
(ousists of a heavy iron frame, at one end of 
which is a vise for clamping the pieces of wire 

or sheet metal of which a sample is desired. A 
milling cutter of high-speed steel is turned by 
means of the handles shown and automatically 
fed forward against the sample by means of a 
set of gears. The millings may be caught on a 
piece of cardboard of just the right size, and are 
ready to be weighed into the boat. The cutter 
may be sharpened several times. Complete with 
extra milling cutter and double wrench.. 60.00 

COMBUSTION APPARATUS, Stetser-Norton. Since this apparatus does not differ materially 
from the Vanier Combustion Apparatus described and illustrated under No. 3138, it is not 
described in detail. By the substitution of the Ascarite filled Stetser-Norton Bulb No. 123A 
for the Vanier Bulb, and the use of stock apparatus such as aspirator bottles and wide mouthed 
wash bottles found in every chemical laboratory, a Vanier train may be easily converted into a 
Stetser-Norton train. Prices will be quoted on request on either the complete train or anv 
of the component parts of it For complete description, see The Iron Age, Vol. C II, No. 8, 
11 Combustion Train for Carbon Determinations" by J. B. Stetser and R. H. Norton of the 




No. 3134. 



Penn Seaboard Steel Corporation. 



149 















COMBUSTION 



CENTRAL SCIENTIFIC CO., CHICAGO, IT. 8. A 




Nos. 3138-40. 

3138 COMBUSTION APPARATUS. Vanier's, for determining earbon in iron and Bteel by I .mbua- 

tion method Complete as illustrated, with Hoskins Electric Combustion Furnaci with rheo- 
Btat mercury gage and Bafety jar, calcium chloride jar, mercury valve, fused i u 
tion'tube, line tube, Bulphork acid bulb, Vanier'e Combine 1 1 :ihsorpti..n bulb and dryingtube 
(patented), two 3%x% inch Alundum combustion boats, 1 lb. of K. K. Alundc ,<>.\ with 
necessary coi cting tubing, Bupport, damp, glass rods, etc., hot without pressure regulator. 

No v B 

With furnace and rheostat, for volts 11" 220 

Each . $58.00 58.00 

3140. COMBUSTION APPARATUS, Vanier's, sami a* No. tins, hut with Multiple Unit Electric Com- 
bustion Furnace No. 6226. No A B 

With furnace and rheostat, for volts 11" 220 

Each 57.00 57.00 

Parts for Vanier Combustion Apparatus. 

Hoskins Electric Combustion Furnaces. No A B 

Fur volts 110 

62 1 0. Furnace only 26.00 26.00 

621 1. Furnace with rheostat 37.00 37.00 

Multiple Unit Electric Combustion Furnaces, for use on either 110 or 220 volts 

6226. Purnace only 2600 

6227. Furnace with rheostat (voltagi must be specified) 36.00 

3141A Mercury Gage and Safety Jar (A), for indicating amount of pressure and acting safety 

valv ' 1.00 

l4ol<>Ii. Glass Y-Tube, inside diameter 5 mm .10 

23O0 Calcium Chloride Jar (T), 12 inch, to be filled with absorbent material for drying the ,> X \-- 

8 eD 1.40 

3119C. Mercury Valve i V , for preventing back rb.w 90 

3184B. Combustion Tube , In, of Opaque Fused Silica, " glazed, 24 " inches ' iong and "% inch inside 
diameter. 5 qq 

3143. Vanier Zinc Tube (E), to be filled with granulated sine for removing sulphur and" acid fumes 1.25 

3144. Vanier Sulphuric Acid Tube (F). for absorbing moisture •■'00 
124. Vanier Absorption Bulb (G), for carbon dioxide, a combined potash and drying tub,! to be 

weighed, for determining percentage uf carbon is sample ' 6.00 






::i:.o 



3151 
3153 



' - i, TTTy>iiM - : " 

N0 - 31j0 - No. 3153. 

^r'Mir™' OSPeCian , y ada P ted f ° r «" determination of carbon in iron 
the iro oxide forme? • " ™ omm *l*** »<> P«»iee. the boats from the slagging effect ol 

^r fip^asra ^wskl* - sam,>ie - Fur "- i «■ ^ -— k - w 

Length", "mm.".'.'.'.'.'.'.'.'. ft ^ „_ B c D ■ 

Width, mm.... ?2 97 115 1 -- "J 

Depth, mm...... 13 18 ls 1! ' 13 

Each .... ■ 3 10 11 11 7 

COMBUSTION BOAT" Nickel Wt'h ' ?V ", ' \ , ' 3 ° ,35 A0 A0 A ° 

COMBUSTION BOATS Coors Por cilain 1 1 ! : T^ *i M ?* 6 ° 

bottom surface. With handled g J " M ' 1 " : ' n,l ( " ,,s " 1, with "Ctpttoa of OUtsnh' 

No 

Length, mm... " v B '' D E 

Width, mm... " ••• ,; " 60 ss 97 1" " 

Depth, mm '"" ' : 10 12 16 20 

Each .. s 8 < 10 13 

' " 26 .26 .30 .32 -34 

150 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 




Valundum 

• ■■ 

411(11 HHII" 1 

C.S.CB. 





No. 3160. 




No. 3154. 




-*£? 



*i->-<ian — ... 




No. 3156. 




COMBUSTION 




No. 3161. 




» m 



> C.5.C0. 



No. 3162. 



No. 3166. 





of carb^: 












3154. COMBUSTION BOATS, Johnson's, of vitrified clay, without handle. Thickness of wall, 1> mm. 

No A C 

Length, mm 1U0 119 

Width, mm Hi 16 

Depth, mm M 10 

Each $0.17 .19 

3156. COMBUSTION BOATS, Opaque Fused Silica, glazed on both sides, without handle. 

No A B C 

Length inside, nun 44 76 76 

Width inside, mm 13 13 16 

Depth inside, mm 8 8 10 

Each 65 1.00 1.15 

3160. COMBUSTION BOAT LINING, of R R Alundum. Blue Label, a very pure crystalline alumina 
treated to remove carbonaceous matter and surface alkali; used as a lining for boats of 
platinum, porcelain, clay, nickel and alundum to afford protection from fluxing during com- 
bustion. Supplied in glass stoppered bottles in Nos. 46, 60 and 90 mesh. 
Please specify mesh in ordering. 

Size bottle, pounds 1 - 5 

Each 1.30 1 95 3.70 

3162. COMBUSTION BOAT SHIELDS, of Alundum, to protect combustion tubes from the spattering 
of overheated metals. 

No A 



3164, 



166. 



3170 



Length, mm 114 



22 
11 

2.00 



B 

140 
25 
15 
2.00 



c 

l r 's 
% 
18 

.50 



D 

1% 

25 
.50 



For use in tube, diameter, mm 

For use with boat, width, nun 

Each 

COMBUSTION CAPSULES, of Alundum, for ashing eoal, flour, etc. Will withstand high tem- 
perature and can be used repeatedly. Made in mixture RA 84. 

No A B 

Diameter, inches 1 '^2 ^ViQ 

Height, in. lies ' m 

Capacity, cc 7 10 

Each . *. 30 .40 

COMBUSTION CAPSULES, Coors Porcelain, without lip, glazed inside and outside with ex- 

ception of outsde bottom surface, as recommended for the determination of ash in coal or 

coke by the American Society for Testing Materials. Size A is recommended as standard. 

(See A*. S. T. M. Standards for 1921, No. D 22-21, and No. D 37-21, for Standard Methods of 

Laboratory Sampling ami Analysis of Coal and Coke.) 

Xo 

Diameter top, mm 

Diameter bottom, mm 

Height, mm ^ 

< 'npacity, cc 

Each ; • • • ' ' 

COMBUSTION CAPSULES, of Opaque Fused Silica, for ash determinations and ignitions, ucpta, 

1 ^ , ;; h - a c d 

Diameter, inches ■ ^g „. ~^g 

£ ai T ity ' cc ;;;; .85 us 1.35 

Lacii 

For other CAPSULES, see No. 2408. 



A 


B 


42 


,-s 


20 


35 


25 


34 


25 


70 


30 


.36 



151 






COMBUSTION 



:NTKAL sriEN-TTFTC <0. (WA GO, IT. 8. A 




No. 3182. 



I 



I 

















3178. 



■ai:\< 



;;i^> 



3182. 



3184, 

3186. 

3187, 



3188. 



I'-L-l. 



F523. 



Nos. 3178, 79 and 80. 

rniwr-RTi^TTON TUBES Clav, Vitrified, C. M. Johnson's, for >n carbon determinations in 

TTL^JS 3 Industrial .v Eagi. ring ChemJ . v„i. x . n„. ;, foi Jn » 

L913, page 581.) . 

\; , , B 

Length, inches -"_'- 

Diameter inside, inches "» 

Diameter outside, inches •• 'Vi 1 14 

Will take boats up to, inches •••• 

Each * 5 - 73 6.50 

Tapered Clay Connectors, for I ombustion Tubes V 178, without rubber si.. 

For tube B 

Each 2 -00 2.25 

Rubber Sleeves, for ust with Nos. 31 7^ and 31' 

For tube B 

Each 1-75 2.00 

COMBUSTION TUBES. Coors Porcelain, gla ed inside and outei 

No .... B C E } 

Length, cm. . . 60 60 75 

Diameter inside, mm 20 

Diameter outside, nun . . 28 

Will take boats up to, mm L6 20 16 

Each C05 6.55 7.56 8.20 

Note: — For special lengths add or subtract 1 LOO of price fur each em of difference from stock 
lengths. 

COMBUSTION TUBES, Opaque Fused Silica, melting point about l."> tegrecs «'.; unaffected 

l»v sudden changes in temperature. Thickness <»f wall, 2 mm. 

" \.. 11 C E F 

Length, em 611 60 15 75 

Diani'tcr inside, mm 18 1> 

Will take boats up to. mm 15 L8 15 18 

Each, glazed inside only 5.00 6.20 7.00 7.75 

Each, glazed inside and outside 6.30 7.50 8.63 9 38 

COMBUSTION TUBES, Hard Glass, fox use in oxidation and reduction experiments, etc 

No \ 15 

Length, mm L > ( „, 300 (50 

Diameter inside, nun .-, ]u [g 

Eacn ".'.'.". ..'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'. .15 .20 .70 

COMBUSTION TUBES. Hard Glass. 100 cm long Thickness of wall, a to 3 mm. 

Diameter inside, mm gg 

Each ! ! ,' ,..'..'. 1.50 2 00 

For COMBUSTION TUBING see No. 7206. 

-*« 

M - j Nrywcaw 

no. r 523 . 

l ead g ' Wlth spt n,,, • s 'ze, 5% inches over all. Complete with extra 
Each .55 

°WiStuf'newU 1 * KaSily atUChftd t0 " e0mm0n P encil - BolM steel leg, dural^" ^rato. 

Each .20 

Per dozen 200 

152 









>U 



*& 









- 






t 



.* 

E 

- 

73 



- 



E 
- 
U 

6 to 
■ 

B 
J 










peri"* 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S 




No. F2615. 





No. F2619. 



No. F2617. 




No. F2625. 



F2615. 



COMPASSES, MAGNETIC. Metal cap needle, brass ease, card dial, beveled -lass- the tfa 

larger sizes with ring. 



Diameter, mm. 
Each 



10 

§0.12 



16 
.15 



25 

.20 



ree 

Ml 
.40 



F2617, 



F261i>. 



P2621 



F262o 



COMPASS. MAGNETIC. Agate cap needle, brass case, brass dial, 2° divisions, beveled glass, 
with cover. Diameter, 40 mm 1 20 

COMPASS MAGNETIC. Agate cap needle. A low priced but high-grade compass, with dial of 
enameled card graduated in .3° divisions. The needle is of special steel, heavily magnetized. 
The case is brass, gunmetal finish, and has a diameter of 38 mm and a thickness of 16 mm. A 
heavy beveled glass serves as a cover, making the whole practically dust and water-tight 1.00 

COMPASS, MAGNETIC. Agate cap needle, 37 mm aluminum pointer and stop for needle. Brass 
case, raised metal dial with 2° divisions. Especially useful in building gal vanoscopes, tangent 
galvanometers, etc. Diameter, 30 mm 1.50 

COMPASS, SIGHT, watch case form, 50 mm diameter, with raised dial and full circle divisions. 
Bar needle SM mm long, with agate cap. lights and slip cover 6.75 

COMPEESSION PUMPS, see Blowers; Pumps, Air. 




Our Receiving Room, where New Goods are Inspected and Packed for Stock. 

153 




















CONDENSERS 



CENTRAL SCIENTIFIC CO., <|||. \Q O, V. B. A. 










•-^fe 




Nq. 3220 No. 5215. No. 3221. No. 3222. No. 3221. No. 3225. No. 3228-9. No. 3230. No. 3232. 

CONDENSERS 

SO CONDENSERS, Allihn's, of s'^ss with bulb condensing tube, with adapl ealed 

Length of water jacket, mm 

Length over all, mni ,l1 " ' ; IS 

Number of bulbs . 4 ° 12 

Each 51.60 1.75 _ _> 3.60 

10' ( discount in lots of 12. 

5215. CONDENSERS. Allihn's, reftus type, ae oaed with No. 5212 Soxhlel Exti 

No. " 

Length of wat< i jacket, mm • • 

Length over all, mm. . . 400 (50 

Each 1.40 1.50 

10% discount in lots of 12. 

3221. CONDENSER, Fnednch's Screw Type, for either reflux <-r distillation pur] This is the 

most efficient type of condenser for its si :e yel devised, since tl scaping vapors roust 

traverse 'h«' ten turns of the continuous spiral in contact with both the outer ••iir cm.»led 
wmII ami tii. inner water cooled condenser jacket. Length over all, 200 liameter of 

ja<k< j t, 4i> mm .... 6.00 

3222. CONDENSER, Hopkins Reflux, with inner j el 250 nun long. Excellent for . 

tion, as tin- cold water jacket in the center offers a large condensing surface to tin- vapor. 
Length of outside jacket, 275 nun; total length, 380 mm. (See Journal "t the Amerii 
Chemical Society, for December, 1908).... 3.60 

3224. CONDENSERS. Liebig's. of glass with rabbet connections and adapter. 

No \ b ,■ d e F 

Length of water jacket, mm 250 3on 4"»0 50 61 750 

Length of condenser tube, mm .-,- .-,;,-, ( ;;r, 775 875 10 

, ... «_J££!! 90 L10 1.30 1.60 1.90 2.40 

3225. CONDENSER TUBES only for Xo. ::2l'4. >_. ,„,-h in diameter. May also be used for N'o. 32 2. 

'•' "-"'• ,,,,u • • 550 575 675 775 875 1025 

For condenser jacket, mm 250 300 4<>o 500 61 750 

-fciJCll v|» tr\ «f- rrjz cc Qfl 

322v CONDENSERS, Liettg's, all of glass with' inner "t'nbe permanently sealed to packet, with 
adapter. 

Length of water jacket, mm.... 250 300 400 5 500 

Length over all, mm 450 - m :; . (1 8 30 

Each • " "•■ ',. ' ■•-• •; ••■ 1.00 1.20 1.50 1.80 2.20 

... flfflinpmnrM tSJ^S m S ° f 12 ° n Nos - 3222 tc 3228 delusive. 

8229. CONDENSERS, Liebig's Pyrex, same as No. 3228, but of I'vp-x glass. 

-*■"-' '" w " !,t " J !U " ke *i mm ■ 250 300 500 

Length overall, mm 4 , ( , -„„ m 

323 °' C ^^ SERS - 1 L r iS,s/0f ^ hl -' '** -iMu.n.len.er tn'f s,..,,^ water^eket, wttS 

^W»..r.::::::::::::::::::::; s Zi SSS 

J • • ' •,; 1.80 2.00 2.50 5.00 

3232. CONDENSERS, Liebig's of bSSJS'SS 1 ?- 1 ° t9 ° f 12 " i 

tube and rubber connections. """ in diameter . fitted with S b " M"*"""! 

Length of brass jacket, mm ,,_ 

Length over all. mm. . . 



Each 



■ • . • ■ 



• 4 .■•*... . 



• > ■ * • - • » - . 



4.50 



750 

5.00 



154 



-^ 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



CONDENSERS 




3238. 
3240. 



324 2. 
.1244. 
3241 




No. 3234. 



No. 3238. 




NO. 3240. 

CONDENSER, Soxhlet's Spherical, of copper, tinned inside and nickel-plated; diameter, ion 

$4.25 

CONDENSER. Sulphurous Acid, Liebig's, with two glass stop-cocks on horizontal tubes. 2.50 
CONDENSERS. Zinc, with heavy block tin worm, for use with Distilling Apparatus No. 4148. 

An. •,« A TK C* t\ 

Por still, capacity, gallons % 1 2 3 

Height over all, inches e% 7 10% 14% 

~ — • 5% 7 8% 9% 

% % % 

6.50 7.60 9.40 13.00 

CORD. Chalk Line. Masons', A inch; in hanks of 20 feet p er hank 

CORD. Fish Line, Silk, braid,. I, 25 yards on card per card 

CORD, Twisted Flax, fine quality, in fc-lb. balls Per ball 



^j 1 — — 

Diameter outside, inches. 
Diameter of tin tube, inches 
Each 



E 
5 

1-V's 

12% 

•\ 
15.40 



.08 

.40 

1.00 





. . 11 11 II 1 1 -11'' 

* -m r ill V 

If j| I II f II ■■ -. 

Nos. 3246-56. 

3246. CORKS. XX Quality, regular length. 

JJ° " 1 - 3 4 5 6 7 8 9 10 

Diam. at small end, inches. r \ ;: s J3 V: ft % ^ U 

Pe r 10 $0.05 .05 .05 .05 .06 .07 .08 .08 .10 .12 13 

p er 100 22 .22 .25 .25 .30 .34 .37 ,40 .50 .60 !62 

Per 500 85 .85 .90 .95 1.20 1.35 1.50 1.65 1.90 2.45 2.50 

No 11 12 13 14 L5 1<> l s 20 22 2 1 26 

Diam. at small end, inches. 13 % fft 1 1A U \-h 14* 1J3 1H Hi 

p er 10 14 .15 .16 .18 .20 .23 .27 .33 .40 .50 .60 

Pe r 100 65 .67 .72 .80 1.00 1.15 1.35 1.65 2.00 2.45 3.00 

Per 500 2.60 2.70 2.90 3.40 4.00 4.70 5.50 6.70 8.10 9.80 12.00 

3250. CORKS. XXXX Quality, regular length, far superior for laboratory work to the XX or XXX 
quality in soundness and freedom from holes. 

No. . . 1 2 3 4 S 6 7 8 9 10 

Diam. at small end, inches. ft % \\ y JX ft ^ U ;: i ifl 

Per 10 . . .08 .09 .10 .12 .15 .17 .20 .25 .30 .32 

Per 100 .37 .47 .52 .62 .75 .85 1.05 1.30 1.55 1.60 

p er 500 1.50 1.90 2.10 2.50 3.00 3.40 4.30 5.15 6.30 6.50 

N11 11 12 13 14 15 lti IS 20 22 24 26 

Diam. at small end, inches. ~s 4J| 1 1 A 1& 1-& U* 1J3 1J3 1 '■ 

Per 10 33 .35 .40 .45 .50 .65 .75 .85 1.05 1.50 1.75 

Per 100 1.65 1.80 2.00 2.30 2.65 3.25 3.80 4.40 5.25 6.00 7.00 

Per 500 6.60 7.30 8.00 9.25 10.70 13.00 15.25 17.75 21.00 24.00 28.00 

3252. CORKS, XX Quality, Xos. 11 to 11 assorted, in gross packages only Per gross .55 

S253 CORKS, XX Quality, Nos. 12 to 26 assorted, in gross packages only Per gross 2.25 

155 







I 



I 





















CORKS 



CENTRAL SCIENTIFIC CO., Clin AGO, U. 8. A. 







3256. 



3258. 



3264. 

..-06. 



320S. 



3270. 




No. 3258. 




No. 3266. 






I 

No. 3270. No. 3208. 

CORKS, Selected Grade, regular length, finest quality, for use in chemical labi ^n e - 
pecially light cork, practically fn-<- from hol*">. specially re< onunended foi laboratonV 

where distillations and extraction* are made with volatile liquids. e9 

No 1 2 3 4 5 

Diam. ;it small end, inches A % is i- 

Per 100 SO. 40 .50 .60 70 % 

Per bag of 500 1.60 2.00 2.40 280 360 

, N " ' ' v I 1" 11 l2 

Diam. at am all end, in< hea . ;;, j^ 

**r 100 1-00 1.20 1.45 1.90 2.05 230 2.50 

Per bag of 500 4.00 4.80 5.80 7.60 8.20 9.20 lo" to 

No 13 n i;, ,; i g l9 v ™ 

Diam. a. mi.;i II .11.1. in-iirs . . }* i ]^. i ,< , " - 

? er i 00 ■•■•-•■ 2.80 3.20 3.60 4.50 4.85 5.20 5.60 00 

Per bag of 500 n.60 12.80 14.40 18.00 19.40 20.80 22 40 2400 

COKES. Plat Specie Corks. XX Quality, with alight tape, ; for wide mouth bottles. 

Dianutf. at large end, inches! % % \ iu iu is ,',' ,? ,1 

Diameter at small end inches... . & £ i f J? , s £ g J 

plrioo 18 - 18 - 20 - 25 -26 -35 .36 ,10 .50 

Pe r 500 95 - 95 1 ' 05 *- 25 L27 175 l-»0 2.20 2.60 

No 385 3.85 4.20 5.00 5.10 7.00 7.25 8.8P 10.40 

PJam^teVii'larg^endiiaihes ." ' '" 1 1" \ £ £ .'' £ * £ 

ESSTiSS?. L "" ■•■•" ! ? l | ? 9 P 8 S ! 

Per 10 % % % •'* r 's "> % % 

Per 100 ,5 ° 65 - 70 -80 -90 1.10 1.15 1.45 

Per 500 2,9 ° 3 " 35 3 - 65 *■*<> ^-60 5.50 B 80 7.25 

cork hoppb '.' !\ 1L7 ° 135 ° U ' 70 176 ° i8 .50 22.30 23.50 29.00 

oobI S ; : rd „ t* 8maUest **•*•** «* — » « 

CORK BORERS, !,„,, bra8Sj in 8et8j U| , h puncfc ^ ^ 

Number in set. £ ^ ' ' ' ' 

Diameter of borers, inches' a , „ U ! ' I 5 

Per set KeMa Kr^i Kr% i H<r% 

nn ,. .; 50 1.00 1.75 2 60 3.50 

CORK BORERS , ' , T " ^ ° f 10> 2 °' ' diSCOuat * lots of 10 °- 

K BORERS, of hard brass, b .... wit|l 1H , , uft] ^^ ^ ^ ^ ^ ^ 

Number in set . . . ** C D E 

Diameter of borers," inches 6 : ' '- l5 

Pet set Hr%6 -1.;-% :i i,; :t » ttr% 

10' Hi*,™.* ", 1 - 20 2.00 3.20 4.10 

CORK BORERS, of ste^ut • ° f * "? dlSC ° UDt * l0tS ° f 10 °- 

differ by ' u , im-h in diameter*' *" ****' "'"' ll " llv " lu: ' 1 handles, and punch for each Bet. Bon 

No 

Number in set! '. '. \ \ '. A B C 

Diameter of borers, inches 3 6 8 

Per set :: %■% %-%« s"p 

10% discount in lots'of id "aft* Hie' ' ' V- ' \ 85 L6 ° 1,8 ° 

" s 0I - u - 20 ' discount in lots of 100. 

156 



m 




libera^ 



3 

II 



i 
S20 jj 






I» 



1j 



33) j« 

■ - _.- 

wttfct 

k :. 
i : 

5 J 

r LI U 

"- 
I I 

- 

115 

S50 SI 

£30 23 



I» 



Cm -i ■'••" 
D 

- 
3J 



r*** 



5 



CKXTRAL SCIENTIFIC CO., CHICAGO U. 8. A 



CORK BORERS 








No. 3274. 




No. 3278. 



No. 3272, 




O 
SECO GAUGE 

Rubber Stoppers 
Tapered Cbrk-3 

e CENTRAL, * 

k isciENnric ; 

CO, 



No. 3296. 



£ 




No. 9146. 






No. 3292B. 



No. 3304. 



No. 3o06. 



No. 3280 



3272. 



3274. 
3278. 
3280. 

8146. 

329211 

829 



CORK BORING MACHINE. Can be serewe I firn.lv to table. With this machine it is possible 

to drill rapidly both rubber and cork stoppers. Complete with 8 interchangeable steel drills of 

from : ]i; to "\ inch diameter $22.50 

CORK BORER SHARPENER, B teel com- with knife 1.60 

CORK EXTRACTOR, for use when corks have been pushed inside bottle .20 

CORK GAGE, of aluminum, for use in determining the proper size of coik or rubber stoppers for 
botth-s, Masks, etc. For rubber stoppers from 00 to 12 and cork stoppers from 1 to 86. . .15 

CORK KNIFE, with good quality steel blade 4 inches loug, and round wood handle 25 

CORK PRESS, rotary form, for corks up to 1% inches 1.85 

CORK RINGS, Suberite, of compressed cork, for supporting flasks, etc Highly recommend. id 
as a substitute for straw rings on account of their appearance and durability. 

Diameter inside, mm 30 60 90 120 150 

Each 30 .50 .70 .80 .90 



3300. 



CORK SHEETS, XX Quality, size 4x12 inches. 

Thickness, inches 

Each 

Per dozen 



.18 
180 



3304. CORKSCREW, with ring handle and shield 
3306. CORKSCREW, self-pulling 



.27 
2.70 

.20 

.80 






157 




COUNTING 



I i vrwAi- SCIENTIFIC CO., CHKA.-o. r. s. a 














Nos. 3324 and 3324 A. 



No. 3319. 






K mm de 





No. 3326. 




DCPTM 

0100-l 



/.,> 



'// 




No. 3320. 



No. 3327. 



COUNTING APPARATUS 



;:.>!!'. 



20 



COUNTER, Hand Tally. for use in countingcolonies of bact< ri i, Mood corpuscles, etc. -u r ned 
to fit either hand without discomfort, as nil corners are rounded. It can be quick] 
by >>ne turn <>i the kin.lp '_ $5 00 

COUNTING APPARATUS. Stewart, for counting colonies of bacteria. Consists ,,\ ;i har-hw.od 

box, lL\\s x ii 

aide support 

do not puss 



3321. 

122. 
124. 









3324A. 



inches, in which is placed a 16-candle power inran out lamp and an adjust- 
for carrying the Petri dish, illuminated bj oblique rays from the lamp, which 
into the eyes oi the operator. A mini jjlnss plute is [Provided op of tl 
and the counl is made by viewing the colonies on the Petri dish through th< glass i 

Journal of Medieal Research for January, 1906) ' 20 00 

Reading Lens for use with No. 3320 3.00 

Ruled Counting Plate only of No. 3320 60o 

COUNTING APPARATUS. Wolff huegel, for counting colonies of baeteiiiu ' its of hard 

wood base with drawer furnished with one black and one white ba< kground above which the 
ruled glass plate is held by four corner supports. The ruled glass plate is L65 mm -(inure with 
a ruled area 120 mm sauare qqa 







aa-2;. 



3326. 



::.;J7 



3327A. 



to 

arP fnr.h ' ,x ;'| ,,:, '^ Ul ' ,l \ wl 1 t j 11 » the ar,,, enclosed between the three outer circles whw- 

M etl v fn?? '« ha "- s P ac ?' ,' s "" •'" uni;i1 '"' A PPWed Microscopy and Laboratory 
wi^lSeSiil? Complete on hardwood base with drawer and one each black and 

Ruled Glass Plates' i« „un' square,' for NoaV 3324 and UfttiL "^ 

Type of ruiing .'.'."".' ',".".'.*; _ * * & 

Each ^ Olffhuegel Jeffcr 

F °i, C sZT g APPatatUS t01 Fr ° St ' 5 *""» Plate ' Metiod ' rf »"&« baeto™ .ilk. JZl 

\ng 
glfttt 

ob- 

14.00 

lipOH 

ipen- 
plete 

Thickness, mm ' 3 mm square - 

Each -•»:::::::::::::::::::: * ^ 

l.UU *- w 

158 






■••u 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



COUNTING 




A B 

No. 3328. 



I) 




No. 3S30. 



C 5 C* 

-J 



! 



■ 



oiciiti tf | 

ii lamp u 






lihir'i 

with l v. 

: 
m ad M 



- 

1.70 



i 



nbertftW' 
reiaforcri «*J 

bm tk < ir J 

nrulfi w 
ffithuot <**- 

If 

LOO 





No. 8344. 



No. 3340. 



For Counting Chambers for Blood Counts, see Xos. 1248 to 1259. 
For Counting Chamber for Cytological Investigations, Bee No. 1246. 
For Counting Dishes with Ruled Bottoms, see No. 3596. 

3328. COUNTING PLATE, Frost's, printed in blaek with white lines, on good quality Bristol board. 
The cross lines divide the figure into square centimeters. Four of th"se, ju>t :ibove the center, 
are subdivided. The numbers 40, 60 and 80, give the area of the diska bounded by the circles 
iust below them. The area of each sector, a and b, is one-tenth Of the area enclosed by its 

circle $0.10 

20% discount in lots of 12. 

3330. COUNTING PLATE, Jeffer, similar to No. 3328, but with Jeffer'a ruling aa described under No. 

3324A eacn 10 

20% discount in lots of 12. 

8344. COUNTING GLASS, for use in counting colonies of bacteria in the Koch method for water and 
milk. This glass meets the specifications of the American Public Health Association. Magnifi- 
cation 3 ! x. (See Standard Methods of Bacteriological Analysis of Water and Milk, of the 
A. P. H. A.) 4' 00 

3340. CROSS SECTION CHART, made of extra quality blackboard doth, with Hues in white, accu- 
rately spaced and permanent. Its surface takes crayon marks and permits then- erasure as 
easily as a blackboard. Can be rolled up when not in use. Size of ruled surface, 36x36 in 4.50 

3344. CROSS SECTION PAPER, one millimeter divisions with heavy centimeter ruling. 1" sheets 
17x17 cm, on transparent onion skin paper P er luire .50 

3346. CROSS SECTION PAPER, accurately ruled, printed from an engraved plate. One millimeter 

divisions with heavier centimeter ruling; size 40x50 cm Per sheet .18 

Per quire 3.50 

3347 CROSS SECTION PAPER, same as Xo. 3346, continuous ruling in one millimeter divisions, 50 
cm wide Per y ard - 30 

3350. CROSS SECTION PAPER, ruled in Ho*" inch divisions, size 10x21 inches Per sheet .10 

Per quire 2.00 

F8&05. CROSS SECTION TABLET, containing 60 sheets of paper metrically ruled with heavy lines every 
Cm and light linos everv 2 mm, with note ruling and marginal line on opposite side . each .22 

Per dozen 2.10 

3354. POLAR CO-ORDINATE PAPER, printed from an engine divided plate, about 17 em in diameter. 

Per quire .60 

159 












CRUCIBLES 



i i ,ti;m. BCIENTIPIC « 0, CHICAGO, V. S. \ 










No. 3360. 
No. 3366. 




3360, 









:;..hl 






3366. 
33G7. 
3368. 






3370. 






3372. 



3373. 




No. 3372. 
Nos. 33G8-70. 

CRUCIBLES, ALL KINDS 

CRUCIBLES, Alundum, for general laboratory use. Them crucibles will stand any tempcraturp 
available in the laboratory, and tin- with their high thermal conductivity, makes them valuable 

for coal analysis, drying materials, ijrnitin^ filters, etc* Pnrniahed in fine mixtures only. 

No A B C D " E 

I !apacity, cc 1 20 25 30 40 

Diameter, inches IMe 1 ] 1% 1% l T 

Height, inches ]■ ■ ". p~ 

Each $0.35 .35 .35 .40 .40 

COVERS. Alundum, fur N«». :::i»i0 Crucibles 

£ : M & E 

For crucibles, cc «« 

Each '.'.. .30 .35 

CRUCIBLES. Alundum Filtering. i.»r rapid filtration; >.-. . > pel cent, of the time usually re- 
quired. Not affected by solut i..., , ,,t ■ : ,.-i.|, .., alkalis and can n \y be di stant 
weight. Recommended bj Spencci for use in sugar analysis 

^"o \ g 

* Capacity, cc ' ' '/ 35 

I 'iameter, Inches l". i'-' 

Height, inches ..'.......'.'.'..'. ....... " ]i] \iu 

Each, medium porosity , R.\ -.60) 35 40 

Each, coarse porosity | RA 98) 35 i0 

CR U?u^'ri^X Um Melth ? S ' -W? T * tr *«™J, •'"" I »eU adapted to experimental electric 

absoJbenT lt'„r r !? ,"" ^ t01 . "*" " here ** : "' ! **•* on account of their 

absorbent nature. Pnrniahed ... fine mixtures only. Price of No. 3368C includes cover. 

AO 

I'Kun.trr.in.h.-s':::;;;;;;;;;;;;;;;;;;; A „ H 

Height, inches ' ; :,"> \ 

Each - - - *% 

75 1.25 2.00 

^J^ui^r ^ e r lting ,' Sirn ! lar t0 N ,°' 3368 « bu « of —'Position especially adapted for 

CRUCIBLES. Denver Fire Clay, for assay work ; without covers. 

Capacity] grams" .* '. 1 V B C D E 

Height, inches. ' 10 15 30 

SSi-t^tai;:::::::::::::;;;:;;;;;; g ^ «* g 

207, diBcount in original ..arre.contaimng.-. £ & 2§ ^ » 

COVERS for No, 3372. 

Per dozen 

60 ,60 .75 .95 U° 

160 



/• H 




CENTRAL SCIENTIFIC CO., CHICAGO, IT. g. 



hntt. ^ 
5 



I 

* 



' i ': ■ • - 

i 

s 

I I 

i ; 






- « 

us 

m 



- 



5 

u 





CRUCIBLES 






No. 3392. 



No. 3388. 







No. 5376. Nos. 3400-1. No 3390 

^ 90, No. 3394. No. 3396. 

3376. CRUCIBLES, Denver Fire Clav hi»h #«-™ p« 

No ay> hlgl1 f ° rm ' for S" 801 "" or open furnace work; without covers. 

Heighl , inches ~ i? F G J K L 

I'iam. at top, inches.....'.'.". J.. *™ * "''< ,;; 's 7% 8 

Per dozen *% * ?% 3% 4% 4% 5% 

20% discount in original barrel containing ' \lo \nn oo? 55 4 , 30 5 ' 75 80 ° 

3388. CRUCIBLES. Wrought Iron, light, with ^ovfrs 3 °° 225 U0 75 50 40 

No 

Capacity, ec ... ^ '■ ( D 

Diameter, inches . L>0 50 100 L'iiii 

Height, inches '.". J% 21 <6 2% 3% 

Each 1% 1% 2 2% 

3390 CRUCIBLES Nick,, * " "* *"" * * ""' " » ^ "" "^ ^ 

3390. CRUCIBLES, Nickel, spun from pure sheet nickd, with covers. 

iiHSE:::::::::::':: ::::::::::::: S » » » » 

£s ht ' Ueh - ::::::;:;::;: 8 8 '? It % 

.-••. ••••• -90 1.00 1.20 1.50 2.30 

iiqo PPTTfTTiTr. « i , «- 10% discount m lots of 12. 

.Si^t '' of heavy pure nickel, for use in muffle furnaces for burning off filter 

paper in silica determinations in iron. Diameter, 28 mm; height, 15 mm 40 

8394 PTmrrRTT. m , , „ 10% discount in lots of 12. 

CRUCIBLE Nickel, Pennock and Martin's, for the rapid and accurate determination of sulphur 

nsertt f i~n^^ °* * V ?^ "^ "V^ ° f 4 ° CC «*■«"* wi,h Prorated lid for 
hri Vl % i uoll w ire »™ounted upon an alum.num base. Diameter of erucihle, 1 Li inches: 
height, 1% inches. (See Journal of the American Chemical Society, for December 1003, page 

«or ^^^l^^^tto^'^'HittnVinWaii 3 °° 

3398. CRUCIBLES, Plumbago or Black Lead, Dixon's, without covers. 

rL°' "V"i'"i'W\\ ° n " n,, ° 0000 1 2 3 

' 'U 'ant v about, fluid ounces 1% 2 3 4 8 12 16 

[eight outside, inches 2" 2% 2'.. 2i%- 3% 4'1 5U 

E mm. at top, outside, inches 1% 1% 1% 2% 3% 3% 4% 

3397. Cove^?or N'o/3336. ^ ^ ^ * ^ - 90 "« 

Tofit Crucible, No 00 000 0000 l 2 3 

3400. CRUCIBLES Coors Porcelain, high form,' glazed throughout with exception 'of outside bottom 

surface] without covers. 

??' •■• 00 1 2 

;| I I; ""- V ' ''<• 1" 15 30 57 

Diameter at top, mm ;:i. 35 41 

f eight, mm o- 27 3 - 4 ~ 

3401. Covers tor Crucibles No. 3400. 

£? 00 l 2 

IMameter, mm 35 42 47 59 

Each 06 .06 .08 .11 

10'' discount to commercial institutions, 15% discount to educational institutions on Nos. 3100-1 
ior orders amounting to $100.00 or above. 

161 

i 









CRUCIBLES 



OBNTBAL «^n«mPIO 00, CHICAGO, 0. & A. 





Nos. 3404-5. 



No. 3408. 




No. 3412. 
No. 34L4B 




C " J 




No. :i4!6. 




No. 3414. 








3404, 



CRUCIBLES, Coors Porcelain, wide form, -la/. .1 throughout with exceptioi lUide bottom 



3405. 



Burface; without covers. 

No 

Capacity, ec 

Diameter :>t top, mm 

Height, mm 

Each 

Covers for Crucibles No. 3404. 

No 

Diameter, mm 

Each 



linn 
§ 

l!» 
$0.14 

ooo 

■ 

.06 



mi 
12 
37 

L'l 
.18 



mi 

M 

■ Oti 





17 
41 
25 

.22 





47 
.08 



1 

I.. 

29 

.30 



1 
2 
.08 



-,-■ 



— 

so 

.41 

•> 

ft 

.12 



3 

<■: 

44 

.E2 



3 
.14 



4 

15 
81 

1,11 



1 1 5 



4 

88 
.18 



5 

96 
65 

.74 



5 

107 
.22 



34 ns. 



CRUCIBLE Caldwell's Form. Coors Porcelain, glased throughout «itli exception of outside bot 
turn Burface with removable perforated plate to tit in bottom. Size Mo 3; capacity, 25 c*. 



3409. 
3412, 



Without cover 
Cover only foT N 



3408 



.66 
.08 



3413. 

341 l 
3416. 



Perforated Disk only for Mo. 3408. 8ize Mo. 3; diameter, 22 mm .24 

Perforated Disks. Platinum, for No. 3408 Crucibles, see Platinum Ware. 

CRUCIBLES, Gooch Form, Coors Porcelain, glased throughout except outside bottom --iirfaoe. 
Perforations about l nun in diameter. Without covers. 

No 2 

Capacity, ec • • 10 

Diameter at top, mm -'" 

Diameter :it bottom, mm I s 

Height, mm 30 

Each 36 

Covers for No. 3412. 

1 Hameter, mm 3f» 

Each 06 

CRUCIBLE, Gooch, for Bitumen in Asphalt, Coors Porcelain, with large filtering surface. Height, 

24 mm; width at top, 45 mm; width ;it bottom, 35 mm. Capacity, 4 < » CC 60 

CEUCIBLES, Rose's, of un glazed porcelain, complete with perforated cover and delivery tube. 



3 


4 


25 


35 


35 


40 


go 


25 


40 


43 


48 


.54 


42 


47 


.06 


.08 



No. 

Capacity, <•<• 

Diameter at top, mm 

Height, nun 

Each 



34 1 7. 



34 IS. 



3410. 



Covers, only of N... 3410. 

No. 

Diameter, nun 

Each 

Crucibles, only of No. 34 16. 

No 

Each 



Delivery Tubes, only, with dang.-, of No. 3410. Length, 14.. by 30 mm. 
Each 



1 
15 

31 

: 

1.15 

1 

38 

.07 

1 
.22 

1 
.86 



a 

30 

39 

43 

1.26 

2 
.08 

2 
.32 

2 
.86 



3424B. 
3425B 



Note:-10- discount jto commercial institutions. 15- discount to educational institutions on 

wos. 3404 to 3419 for orders amounting to $100.00 or above. 

7 

Without covers ,.' . .'...,. 5 - 63 

Cover, «.nly for No. 3424B Crucible 1.80 



w.wna o-uivuntiug to »1UU.UU OT aDOVe. 



162 








^^hJ^^nrio co., chicaoo, u. a v. 



CRUCIBLES 



NOS, 3 128-9. 




No. 3432. 





No. 3440, 



No. 3438. 






3428. 



3429. 



3432 



N °- 3446 - No. 3448 

CR.CIBLES. Sand, « Assa , rmiml ^ ^ ^ _ ~ 

Diameter outside, inches '"" j% 

Height outside, inches. . . 

Each 2 % 

Per 100 . . . $012 

Covers for No. 3428 Crucibles! 10 °° 

No 

Each *'.'." A 

Per 100 - 11 

CRUCIBLES, Opaque" Fused Silica, ' wide' for," ' ' 



B 

1% 

3 

.15 
11.50 

B 
.13 

10.50 



c 

3'-. 
.18 
14.00 



I) 

4 

.20 
16.00 



E 
2% 

.22 
17.50 



c 

.14 

11.00 



' "*"-'*««- ■■■ ««u Kjiiitd, wide torm <)<) H<V, sin in ■ 

temperatures up to 120()-('., a ...l for short u,.,';, 1 / % . ,ay ,u ' S,,I M" '•'! i 

by rapid changes of •-^J^^^JS'^Lnft &*■» l "W li » 

phosphoric. * ' BXce P t hydrofluoric, and above < 



(MM) 



3433. 



3438. 



No. 

Diameter, inches 

Height, inches .-i " 

Capacity, cc ' ' "J* 

Each - 4 

Covers, Opaque Pused Silica, for No. 3*432 crucibles 

1 or crucible, No 00(J 

Diameter, inches .... , 

Each ."."'.''.' .'.".'.' ." 55 

CRUCIBLES, Saver, spun from' pure sheets,' with cover. 



mi 

1% 
% 
10 

.85 

Oil 

I'. 

.(I.) 



'» E 

■15 .16 

11-75 12.00 

be subjected continuously to 

Not affect. 1. 1 
400 degrees C. f 



1 

15 
.85 



1 
1% 





2 

.60 



1.00 

1 

-', 
.65 



2 
2 % 

i He 

40 
115 



3 

65 
1.65 



2 

.85 



2*. 



Cap^'ity, cc . .".."." .".'."." .\\' - t 

Diameter, inches -" 

Height, inches .,'- 



344ii. 



Approx. weight, grams 
Each 



2 

35 

3.20 



B 

;:n 

l\ 

I 1 , 
IS 

4 00 





so 

1*4 

2 
60 



3 

1.00 

I) 
75 
2 

-", 
Sit 




3446. 



No. 

Capacity, ounces 
Each 

CRUCIBLE HOLDER, for use' with' any 
ring 

well 

No. 



A 
1.40 



I: 
6 

2.20 



'*«.ux. nvijuiuK,, tor use with any ordinary 60 degree funnel i s,„ .i-.n,- ..m..;....* "♦, 

i 'Z:- iTf % , in % * «? '"^mm of ^crucible, ('an be use! \v thV Jl/'iJ ld- 
I, Alundum or Johnson 's Clay Crucibles. Made of one piece of soft rubber ' 



3448. 
3450. 



For crucibles, top diameter, mm .....".. o 7 

Each " 



B 

35 

.20 



c 

40 
.20 



r»TTni»V a8 Show "- Rub °*r holder only " " "" " 

™ B ^ ^? L °° E * Wal ^ r 's. of rubber with small glass funnel set "in! The 'opening i„'the ton 
Hi take- a No 3 Gooch Crucible of 25 ec capacity. The loner end is aharplv tapered "o tha t 
will fit the neck of a 250, 500 or 1000 cc filter flask. Without flask or crucible 35 



163 



CRUSHERS 



•entbal bctbntoto ca; Chicago, a. b. a 



































^ 

No. 3470. No. 3466. No. 3474. 

CRUSHING AND GRINDING APPARATUS 

The crushers, grinders, mills and pulverizers listed in this section have been caa leeted to 

mee l every requiremenl of the experimental and testing Laboratory. The) are :ill American made and 
have been In use for enough years under varied conditions t«> insure their serviceability and durability, 
[n describing them, the attempt has been made in every i ase to state the partit-ular - for which the; 
arc best adapted, based on the experience of our trade. 

Wo wish to direct cspeciaJ attention to the Braun line of crushers! grinders and pulverisers! of 
which a complete line is carried in stock for immediate delivery. 

3460. CRUSHING PLATE, Bucking Board, i»f rhiUiMl iron, with rim, for powdering ore rock, el 
Complete with rubber of same material with set-in wooden handle. 

No * 

si/< , inches - - • • 

Weight, pounds l (HJ 

Each 515.00 

3466. CRUSHER, Weatherhead's, for hand operation, for crushing and pulverizing at one operation. 
Can be used foi any material, from clay to pig iron. Cover of machine is designed for use as 
small hand mortar, using end of handle as pestle. Diameter of crusher, about L2 inches; height, 
about s inches; weight complete, 100 pounds 38.00 

BRAUN CRUSHERS 

170. CRUSHER. Braun Simplex Ore. for hand and power operation. for crushing small samples of ore. 
Fineness lit' tin- product can be easily controlled by turning two regulating its providi 
with hand-wheels. The machine can be easily cleaned by removing with one blow of a hammer 
a wedge which holds the stationary jaw in place; the entire operati in of opening and closing 
can be completed in one minute. Crushing plates are of hardest steel, ami can I »e reversed or 
easily renewed when necessary. Capacity, 100 pounds of ore per hour reduced to W «nch and 
smaller. Height of machine over all, I s inches; width, 15% inches; Length, 20 inches; size of 
of jaws, 6x3 inches; opening of jaws, - iuches; diameter of wheels, 16 inches; power required. 
V6 h. p.; Bpeed of operation, 200 r p. m.; shipping weight, 197 pounds 7800 

3474. CRUSHER, Chipmunk, Improved Type VC,f or power, with all Bteel frames, rigidly secured, togsthw 
with strong studs. Bearings are of best phosphor-bronze which can be taken up when worn, m 
easily renewed. The fineness of the product is readily controlled by the hand wheel in front. 
The stationary jaw lifts out permitting easy and thorough cleaning of interior. When operating, 
the vibratory jaw is given a forward and downward motion at lower end compelling the dis- 
charge of the crushed material. A special feature of this machine is ita large capacity for the 
si/r ut' the jaws. Dimensions: length overall, is indies; height, 19 inches; width, in inch.-; 
size of jaws, ::x«-, inches; opening of jaws, 2%x3 inches; dimensions of pulleys, 16x2% inches; 
speed, 400 revolutions per minute; power required to operate 1 h i> • capacity, 300 to 400 
pounds per hour; shipping weight, 235 pounds . 107.00 

;;47(>. CRUSHER, Chipmunk Improved Type VC, same as No. 3474, hut' with" light and loose pnlleya for 

•>.«„ r^o^4 nt «v° nnect i°2 f " ,i,K ' shaft or nu,,,,r - Shipping weight, 270 nounda I 25 - 00 

3480. crusher, Chipmunk Improved Type WC, with tight and loose pulleys, of similar construction to 

No. 3476, but much larger. Dimensions: length over all. '22 inches; height, 26 inches; width, 

25 inches; size oi jaws, !»x4 inches; opening of jaws, 2%x4 inches; dimensions of pulleys, 80x3 

in.- n-s; speed, 400 revolutions p.,- minute; power required to operate, 2 h. p.; capacity, 1000 to 

1500 pounds per hour; shipping weight, 515 pounds . 22°- 00 

164 



■ 



' 3474 



1 



■Dafta i 

. 

-:- 

■ 

I 

■ 

ay 

. 

■ 












CENTBAL_8CIENTIPIC CO., CHICAGO, U. S. A. 



CRUSHERS 





Stationary Plate 




No. 3186. 



Revolving Plate 
No. 3489. 





Stationary Plate 




Nos. 3488 and 3496. 



BRAUN PULVERIZING MACHINERY 



Revolving Plate 
Nos. 3490 and 3497. 




in r U ,ua,„ iti ,, No. 3490 ««4^TM^2^1^5?=3 n'"f"* T *"" 
injl iron ore. ' rwpeci, nut is made specially tor pulveriz- 




An excellent combination for such laboratories consists of a \o 147*5 nr -uca n\ \ i ^ a. 

a x... 3578 n. A. P„,v, riz , r ,oa a N„. U 812 s „„, „„„.„ L/'atVt'l "^ n!T£2^ 



shaft 
3486. 



mou liuo 




coke only 

Note:-Tl.is machine can be operated by power,' using hind" wh'e'cVas 'pulley" ' Power required°% 
ii. p.: speed, 200 revolutions per minute. *<-<i uire a> vt 

3487. GRINDER, Braun Sample, same an No. 8486 hut equipped with plates No. 3490 for grinding 

3488. GRINDER Braun Sample' for Coal' and Coke or for Rock,' forpower," sanie nVxoVM^but^UeS 

with tight and loose pulleys for permanent Installation. Shipping weight, 190 pounds. Com- 

•j. QO a niii^ v J> th J" u ' Bet ot K riu<I, "S l ,lat, ' s for c oai and coke only J 110 00 

3488A. GRINDER. Braun, Sample, same as No. 3488, btit equipped with plat s No. 3490 for' grinding 

KS' R 5S5 WA L PLATES." for coal' and coke only," tot Hob. 3486 and 3488.'.*.'.'. per set "2 00 

SL2" ?fS EWAL PLATBS . for ™* only, for Nos' 3487 a...l :uhsa per set 900 

3496. GRINDER. Braun Sample, for Iron Ore, for power, with s, ial 6 inch e'arbon 'steel grinding 

plates, with low phosphorus content. A high speed machine for power only lightlv hut sub- 
stantially constructed for intermittent use; will pulverize 1 pound of iron ore to 100 mesh in 




3497. 



i»g plates 



RENEWAL PLATES for No. 3496, of carhon'steei Y .7.' .7 .'.7.7.7.7.'. '. .'.'.'.'.".'.'.'.'.'.per set ^l.OO 
Note: — Prices on renewal parts for any of the preceding Sample GrinJers quoted upon applica- 



tion. 






165 



CRUSHERS 



CENTRAL SCIENTIFIC PP., OSIUAW), U. «. A, 














No. 3510. 



3578. 









3579. 



3501 



3510 



3516. 



:i5i'U 







No. 3578. No. 3522. 

PULVERIZER. Braun. Type U. A., with tighl and loose pulleys t * »r power usi The grinding 
l»l;iif> are made <-i special alloy possessing :» high degree* of wearing quality and durability. 
They are specially designed to secure best possible service, and can be easily replaced. Tin* 
large ami small lugs (shown in the illustration) ael as breakers and carriers while the outer 
Mnta< «s HIVi t tin' pulverizing. The grinding plates are held in place in such a way that no 
screw heads or bolt heads protrude, and can be quickly and easily removed. The machine 
opens up mi that every particle of material can l>e brushed into the pan. The interior is 
smooth finished with all parts easily accessible for cleaning. The pulverizer is fed through 
a spout in th-' door anil will take particles up to *i mesh and reduce to 1**'* mesh at one grind- 
ing. Length of machine, 23 inches; width, 14 inches; height. 14 1 -.' inches; size of pulleys, 
9x2% inches; speed. 850 r. p. m.; power required to operate, 1 h. p.; shipping weight, 275 
pounds; capacity (quartz ore » , 1 pound to loo mesh in 1 minute $149.00 

EXTRA GRINDING PLATES tor Braun Pulveriser per set 9.00 

MISCELLANEOUS GRINDERS AND MILLS 

GRINDER, Laboratory Ore, with Agate Mortar and Pestle, for power, for reducing ore and 
n>eks to an impalpable powder. The pestle is attached to a sliding rod held down by a 
spring at the top, so as to produce constant pressure on the mortal, which revolves slowly in 

tie- same direction as the pestle, producing ;i combined rolling ami sliding motion similar to 

that in hand grinding, A scraper operates t<> keep the ore in the center of the mortar. By 

dropping one of the posts on the platform and raising the pestle, the mortar can be quickly 

remove. I. The machine is so constructed that no oil or foreign substance can contaminate the 
sample. Beight of machine, is inches; diameter of mortar, 4V S inches; power required to oper- 
ate, Vi h. p., at a speed of 250 r. p. m.; shipping weight, 40 pounds, (For complete descrip- 
tion see Bulletin 422, of the United States Geological Survey, "The Analysis of Silicate and 

Carbonate Bock," by \\\ P. Eillebrand, page 55) ' , 83.50 

GRINDING MILLS, Laboratory and Drug, for hand operation, for grinding herbs, i grains, 

feed ami other dry substanc 's. 

No 2 3 5 7 

Height, inches joi^ | - !7 21% 

Diam. of wheels, inches s ^ [QS& pju: 17 

Weight, pounds ,....!!!! 15 22% 36 62 

- Each 7.00 11.00 16.00 2L00 

oils, { 

ght, 

r ol 

GRINDING AND PULVERIZING MILL, Nixtamal! "for hand 'operation; "for" Veils, herbs, -rains, 
coal dry bone, limestone, etc. Will pulverize limestone fine enough to pass through a 100 
mesh sieve. Capacity (Rrain, r> pounds per minute. Total weight, L>4 pounds. Complete with 
three sets of grinding disks, course, medium and tine ......... 15 - 00 

166 




in 



KfiirTC^Z 



■ X^BI 



* 



wJ liar. 
I ft 

s nj ik I 
, The c 

Th« istiin 

shiteitpa 
ijjf of pdo| 

lg tag 

OSJ 

perset il 



;«si 

nataffliMH* 

'.juir>'it»#r 

ib»l 

•:-'■ 


,,ri-.'-. - ; ' 






5 
If 

K 

i.00 
- 







CENTRAL SCI ENTIFIC CO.. CHICAGO, V. B. A. 



CRUSHERS 




No. 3528. 





No. 3534. 



No. 3536. 





No. 3540. 



B3T 

iHMPtNlWKVlU 




No. 5542, 




No. 3544. 



No. 3546, 



3528. 



3530. 




for grinding 

etc Bam 

mess. Parts 

rolled steel, 

$7.5D 



3534. 



3536. 



uSS^?-^ FOItVBBmWS MILL, for hand or power, same as No. 3528, but with hand- 
wheel which can also be used for pulley. Flexible connection between hand-whee and mill 
pcnn.ts easy release of mill for thorough cleaning. Shipping weight, about 20 pounds li.50 

GRINDING AND PULVERIZING MILL, for power, same as No, 3530, but with a bolter which 
os. Hates under outlet to separate -round material into two grades. With two interchan^able 

H toilS haVl,,S a ,,iffCrent gm,] ° ° f C, " th - dipping w.M^t.al.ou. 25 , i^Takea 

22.00 

G ?5?^ Iff™ PULVERIZING MILLS, for power, same as No. 3534» but mounted on pedes- 
oek ' •" ' f( l t h( il in * ***** to floor, can be connected to any incandescent lamp 

socket. Shipping weight. 75 pounds. Complete with two bolter boxes. 



No 

For volts 

Each ... 



A 

110 A.C. 
66.00 



3540. 



111) DC. 
66.00 



3542. 



3544. 



3546. 



3547. 



GRINDING MILL, Enterprise No. O, for hand power, recommended by the Joint Rubber Insula 
tion ( ommittee, for grin, ling samples of rubber and insulating com pounds for analysis See 
Journal of Industrial and Engineering Chemistry, Vol. IX, No. 3, for March V.H7, pa-'e 
6U > 3.00 

MILL, Bagassee Cutter, for hand operation, for cutting slices from bagassee and other fibrous 
material for analysis. The thickness of the slices can be controlled by a special regulating 
device from thinnest shavings to slices % inch thick. With automatic feed 20.00 

MILL, Single Specimen Ball, for power, for pulverizing small samples of any material. Consist- 
ing of a porcelain jar, mounted as shown with 9x1 inch pulley for power drive. Size of jar 
outside, 5.2x5.7 inches; floor space, 9x11 inches; speed, 80 to 120 r. •>. m.; shipping weight, 50 
pounds; capacity dry, V* ounce to 1% pounds at a charge; capacity net, % gallon. Complete 
with charge of flint pebbles 22.00 

MILL, Double Specimen Ball, same as No. 3544, but with two jars mounted to revolve on same 
axis. Floor space, 9x18 inches; shipping weight, 75 pounds 33.00 

Porcelain Jars for Mills Nos. 3544 and 3546, size 5.2x5.7 inches; capacity, 1 <piart..each 8.25 

167 



CRUSHERS 



CENTRAL SCIENTIFIC <0„ CHICAGO. U. 8. A. 





No. S 554. 



No. 8572. 





No. 3558. 



No. 3664. 



3554. MILL. Single Assay, for hand or power, 



3558. 




3559. 



3560 



3572 



3578 



for reducing to an impalpable powder :ni\ materials, 



either hard or soft, particularly those which mus 



i n,. t come in contact with metals. Widely 



cement, and soil laboratories. Size of jar, 8.75x9.65 inches; height of mill, 19 



used in assay 

inches ; fl< »oi space, 1 1 k25 in< 

r. p. in.; shipping weight, 125 pou 



hes; height, 19 inches; size of pulleys, 3x1 inches; speed, 60 to 75 
,1-; capacity dry. 1 ounce to 5 pounds at a charge; capacity 



ii 



wet, 1 gallon; h. p. required to operate, '..,,. With handle for hand operation and with charge 
of flint pebbles Sl5,0 ° 

MILL. Double Assay, for hand or power, s.i in <• as No. 3554, with two porcelain jars, 8.75x9.65, 
mounted to revolve on same axis. Floor space, 14x35 inches; shipping weight, 200 pound 
With pulley 9x1 inch for power, provided with handle for hand operation, and with charge of 
flint pebbles 72 - 00 

Porcelain Jars. B.75x9.65 inches, with capacity of 1 gallon. For Mills Nor 3554 and 3558. W «th 
cover but without clamp each 17.00 

Porcelain Balls for Mills Nos. 3544 ami 3558. 

l»i:iin>trr, inches '; i * 

Per pound 85 .80 -70 

3564. MILL, Grinding and Pulverizing, for power, with tight and loose pulleys. Can be regulated ko 
grind coarse or fine while running. Adapted for grinding Leather samples, cotton seed, cereals, 

lied, etc. Height, I'll iiulus; length, 15 inches; speed, 250 r. p. in.; powvi to operate, '•_• h. p.j 
capacity of hopper dry, .1 pounds; capacity of grinder, '.. pound per minute; shipping weight, 
73 pounds 40.00 

MILL, Beet Shredding, with knives and plates of steel. External parts tinned to prevent rust- 
ing. Easily taken apart for cleaning, Capacity! 4 ounces per minute. Weight, 18 ounces 2.00 

PULVERIZER. Braun Type U. A., s.-e pagi- 166. 

For SAMPLERS, RIFFLE PLATES etc., so e Sampling Apparatus. 

168 









n 




HaScoL 



m-tilt WAj 
and irili tiff 



, an, 






:ht, » r+ 

i with rblp' 

SI 

and ■ 
each r* 



- 

"I' 

Infill - 



■ 
jhipp? «* 









His, 



:'.:,!»ii. 



;;.-,<» 1 



CENTRAL SCIENTIFIC CO., CHICAGO. U. 8. A. 



CULTURE DISHES 





No. 168. 



No. 3590. 






No. 3592. 



No. 3594. 



No. 3599. 
CRYSTALIZING DISHES, see Dishes. 




No. 3601 



CULTURE DISHES 

desi, 



3592. 



3594. 



3596. 



3599. 



3601. 




lor other ANAEROBIC CULTURE APPARATUS, see page 

CULTURE DISHES, Petri, i„ pans, of clear glass with flat bottoms, well annealed to withstand 



rterilipng. The standard dish for plating-bacteria £ ThelOO^b iSTETS hrtta 
-i which ks 9o mm outside diameter. The 75x10 mm dtah la used Cor drying the lS 
man ... the preparation of vaccines and ,,, pneumocoeeus protection tested 



No. 

Diameter of upper dish, mm 

Depth, mm 

Per pair 



A 

-,o 

L0 

.22 



i; 

75 

10 
.25 



D 
100 

10 
.30 



E 
100 

L5 
.30 



dish 
Serial 

G 

1511 

20 

.70 



earthenware 

B 
Top 
10U 

15 
.17 



covers. 

C 

Bottom 

95 

10 

.17 



tops arc 

D 

Bottom 

95 

15 

.17 



10% discount in lots of 12, 20% discount in lots of 144 
Culture Dish Parts, Petri, same as No. 3590, but single tops and bottoms only. The 
suitable tor use as a bottom dish with the Noa. 3592 and 3594 
No \ 

rart . •-•: ..'.'.'.'.'.'. Top 

Outside diameter, mm 10n 

Depth, mm In 

Eacn '.'..'.'.'.'.'. .17 

10% discount in lots of 12, 20% discount in lots of 144. 
CULTURE DISH COVERS, Porous Earthenware, onglazed. for use with 100 mm Petri dish cov- 
ers. >\ ill absorb condensed water during incubation, which would otherwise drip on to the 
plated material, spreading the growths eacn 13 

10% discount in lots of 12, 20% discount in lots of 144. 
CULTURE DISH COVERS, Glazed Earthenware, same as No. 3592, but -lazed outside onh- 
Prevents absorption of spilled liquids such as liquified gelatine, etc., and facilitate* the re- 
moval of wax pencil markings eacn ^6 

10% discount in lots of 12, 20% discount in lots of 144 
CULTURE DISH, Petri, with ruled bottom. Same as No. 3590D, but with bottom ruled into 
square centimeters to facilitate counting of colonies. Size, 100x13 mm . 50 

10% discount in lots of 12. 
CULTURE DISHES, Moist Chambers, double dishes of heavy clear jrlass, with loosely fittine 
cover with knob. 

JJO- ;••••; A 

Outside diameter of cover, mm 150 

Inside depth, mm in 

No. per barrel 48 

Each 1.20 

10% discount in lots of 12. 
CULTURE DISHES, Moist Chambers, same as No. 3599, but without knob on cover enabling 
these dishes to be stacked. 

No. A 

Outside diameter of cover, mm 150 

Inside depth, mm 40 

No. per barrel 48 

Each 1.00 

10% discount in lots of 12. 



B 

200 

70 

12 

1.70 



C 

2 40 

so 

8 
2.60 



B 

200 
70 
12 
1.40 



240 

80 

8 

2.00 



169 



CULTURE DISHES 




No. 3602. 



OBNTEAL sciKNTirir CO.. CHICAHO. U. H. A. 




No. 3C16. 





c '.. 




No. 3628. 



Nos. 3604-5. No. 13359. No 13382. No. 13100. 









3602. CULTURE DISH HOLDERS, Ravenel, of nickel-plated spring wire, to hold dishes 100 mm in 
diameter, for mm iiiat mn or sterilization. 



No 

To hold, disli 

Each 



A 


B 




6 


$0.50 


.50 



3604 CULTURE DISH HOLDER, for 100 nun dishes, of polished copper, witfa inside tray foi remov- 
ing dishes. Size, 9 inches high bj *% inches in diameter 4.00 

3605. CULTURE DISH HOLDER, same as No. :5ii(i4, but made of sheet iron 3.00 

For SEAMLESS TIN BOXES for holding five lotixio nun or four 100x15 mm culture dishes, see 

No. lHL'S, l'4 oz. 

3616. CULTURE FLASKS, Kolle, of PyTex glass, with neck indentation to prevent the culture me- 
dium from flowing out. Extensively used in tin- preparation of typhoid vaccine. Capacity, 320 

cc; number in original ease, 84 each .75 

per case containing 81 56.70 

CULTURE SLIDES, see Microscope Accessories. 

1335D. CULTURE TUBES, heavy wall, ordinal y class without lip, for bacteriological and serological 
work. The 100x13 mm tube is tin usual size for Wassennan work The 75x10 nun tube is 
used as the inner tube, with the 150x18 as the outer tube in making up Durhama fermenta- 
tion tubes. The 125x16 and 150x18 are the usual sizes for bacteriological Cultures. These 
tubes are free from the corrosive effects of repeated autocl&ving. 

No 

Length, mm 

Outside diameter, nun 

Per dozen 

Per gross ......'.'. 1.75 

20% discount from gross price in lots of 12 gross. 

13382. CULTURE TUBE. Potato, ordinary glass, with lip, witfa constriction and bulb at the bottom. 

Length, LoO mm; diameter, 18 mm each -12 

per dozen 1-20 



\ 


B 


c 


1> 


E 


F 


75 


loo 


1 2 5 


1 54 » 


ISO 


2O0 


10 


13 


16 


16 


L8 


85 


.17 


.21 


.28 


.30 


.31 


.82 


.75 


2.15 


2.85 


3.00 


3.10 


8.25 



13400. CULTURE TUBE FILLING DEVICE, for measuring out exact quantities of cultur 

other chemical fl-mls. ( onsets of :1 separators funnel with three -wav stop-cock, t 
which is attached a graduated side tube. ('anaeitv 250 cc 



Capacity, 250 cc 



•e undia and 
to one arm of 

5.00 



3628. CUPELS, Bone Ash, highly absorbent. 

Diameter, inches 

Per dozen 

Per 100 



IV4 

.70 

4.50 



1% 

.85 

5.20 



Hi 
1.00 

6.30 



CUPEL HOLDER, see Blowpipe Apparatus. 
CUPS. Annealing, see Annealing Cups. 
CUPS, Porous, for use with batteries, see Batteries. 

170 



■ 






e& 



&-, 



CENTRAL SCIENTIFIC CO., CHICAGO, IT. S. A. 



CYLINDERS 




2- lo.]]| 



I 



A 

i 

Bid 



tayforwt 

I 

M 



caltw * 
. « . 
ad • 



and wk£. 
jiH ma dbri 

,-ultorw. Ik 



E 

• 
.31 

1 1'.' 



I 





lb at tk W» 



eadi 



: 



!■ 



Hi 






« 5 



& 







X 





Mo 3650 Nos. 3652-4 No. 3656. No. 3657. No. 3660. No. 3662. No. 366-4. 

* 0, No. 3658. 

CYLINDERS, Hydrometer Jars, of heavj ^lass. ««„*,« T 1- 

si/1> B C D E E H J K 

l .M.rhV ' liK-hes 6 8 10 12 IS 18 12 15 

ISFS^ ::::: :::::::::::: 2 % 2 - - - - - 

:!r ,o kr^ h ' l up u, '. a .::::::: d ::::: *>% f * * f u. « .55 

•>«52 Each with flange, unground 35 .40 .45 .»/ ./» *.*o 

,iD io-' c , discount in lots of 12, 20% discount in lots of 72. 

3654. CYLINDERS, Hydrometer Jars, «,f heavy glass, with flange- ground to take glass plate. ^ 

Size m i« is 18 

Height inches » " » 3 

Diameter, inch is - g5 115 16s 

16% discount in lots of 12, 20'; discount in lots of 72. 

5656 CYLINDERS, Hydrometer Jars, with enlarged top to prevent overflow. ^ 

Size , .> 14 16 

Height, inches ■•••••• , ,", 2 2 

Diameter of body, inches 62 " 80 qq 

EaCl1 16% 'discount in" kits' of 12, 20' ; discount in lots of 72. 

CYLINDERS, Graduated, with lip, tall shape as recommend^ by tJ^Burean rfftuutajfe^ 

Capacity, ee J 14 U 1 1 2 5 10 20 

36.7 ^ach'Se'gVaduated.zeroathoUom:. .&° .50 .45" .55 .60 .82 1.35 1.85 3.35 

3658. Each double graduated, zero at top and ^ ^ ^ ^ gQ ^ ^ f 25 g7 g 

10% discount in lots of 12. ?2 ?2 ?2 36 36 2 4 24 

up and down. Capaeity, ee 1" w oj j g g lQ 2Q 

Graduated in, ec ^g J| j Q0 1#20 a 50 2.35 3.35 5.65 

Each 

10% discount in lots of 12. ?2 ?2 36 36 24 24 

20' i discount m lots Of •■• • ••• D , M „ istim . Tester. Graduated to 25 CC 

366" CYLINDER, Graduated, for use with Nn. 7.i<»() Bnmn uuvei . . .60 

iu 1-. Height, 200 mm; &mm^,&JBm 

3664. CYLINDER 

of Agriculture) ^ % ^^ m ^ Qf 1?> 

3668. CYLINDERS, Graduated, Precision or Norm 
of United States Bureau of Standards as 
of the stringent legulations of the Bure 
we cannot guarantee that each piece sent 

utmost car? has been used in th, jlect ^^^ „ ?*£&* 
and we believe that they are equal in accuracy to an> ._ ^ ^ 2g() ,_ 00 lQQQ 

Capacity, ce , 1., 1 1 2 5 10 

Graduated in, cc ••■■• gfo 360 3.50 4.00 5.00 6.00 7.00 

Each i6% 'discount in lots of 12. 

GRADUATES, Conical, etc., see Graduates. 

171 





I 





















DESIOCATORS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A 




Nos. 2754-6. 




Nos. 3750-1. 







No. 3758. 






No. 3570. 






No. 3776. 



No. 3780. 



No. 3783. 



No. 3783A. 



CYLINDERS, Calcium Chloride, see Calcium Chloride Jars. 
CYLINDERS. Nessler's. see Color Comparison Tubes. 
CYLINDERS, Steel, see Gases. 
CYLINDERS, Urinometer. see Urinometers. 

3750. DEFLAGRATION GLOBE for combustions i» oxygen. Diameter of globe, inches; <liameterof 

opening, 2 inches. Globe only S1.50 

3751. SUPPORT and Cup for No. 3750 160 

3754. DEFLAGRATION SPOON, of iron, wit li :i , Inch Clip. Length over nil, 15 inches 07 

10 , discount in lots of 12. 20' , discount in lots of 144. 

3756. DEFLAGRATION SPOON, ..i* brass, -with 94 ''"•» '"I'- Length overall, 15 inches 10 

1095 discount in lots of 12. 20'; discount in lots of 141. 
3758. DEFLAGRATION AND COMBUSTION SPOON. Parker's, with removable % Inch cup which can 
be placed nt one end for combustion and at the other for use in deflagrations tal length, 

about 15 inches 15 

109! discount in lots of 12. 
DEFLAGRATION Spoons for Sodium, see Spoons. 

DESICCATORS 



8 
5.50 



10 
8.50 



3772 



3770. DESICCATORS, Scheibler. with wide flange and covers finely ground to fit. 

Pianutor, inches I " r. 

Each 1.40 1.80 2.40 

10' , discount in lots of 12. 

DESICCATORS, Scheibler, for vacuum, Bame as No. 3770, bu1 with tubulature in cover to take 
rubber stopper. 

I dameter inside, inches r, 8 10 

Each ,...'.....'.'.'.'. 5.00 8.00 12.00 

10' ; discount in lots of 12. 
DESICCATORS, Scheibler, same as No, 3772, but with glass stop-cock anil hook ground in 
tiilmlaturo in cover. 

Diameter inside, inches 6 ** 10 



377-6. 



Each 



3780. 



7.50 10.00 15-50 

DESICCATORS, Fruehling and Schultz, with porcelain plate profusely perforated with small 
holes. 



Diameter inside, inches 
Each 



3782 



8 
9.00 



10 

12.00 



DESICCATORS. Fruehling and Schultz, same as No. 378b."but" with" glass "stop-rock and hook 
ground in cover. 



3783. 



10 

18.00 




172 









CENTRAL SCIENTIFIC CO., CHICAGO, U, S. A. 



DESICCATORS 



No. 3796. 




No. 814. 





No. 3802. 




No. 3785. 



No. 3808. 




No. 3814 



NO. 3790. 



Il R8& 



KkKtittri 
U 

. II 

. fl 

m : 



l 

rMD««ft»* 



■ 



•i 



i 



L---- i: 



10.00 

foraged 



W 






!il 



I 

9.00 

I 

1000 Udrf* 



3783 



DESICCATORS, Fruehling and Scbultz, Pyrex.— Continued. 




with Porcelain Plate No. 3S02, 190 mm 
3783 A. DESICCATORS, Fruehling and Schultz, Pyrex, same as No .3783, ; with -**«*-*» Pyrex **£* 

and hook 

desiccator DISHES. Acid D.shes, of porcelain, $Q g0 

Diameter i l- cm. 

DESICCATOR. Triangular, f«.r use in corner of bailee case; of glass, 2 inches on a ^ ei de, 1% 

inches high 

larefully constructed to provide an airtight 



37*" 



814. 



3790. 



37 



nrsTrrATOR CABINET, ot glass, with wood frame earefully eonstru.n;.. to prov ,«e a . ... .^. 
DESICCATOR CAmiNrii g , , perforated steel trays. Finished ... white enamel 

; i ;;!;Tice,:; ,, ;: , ;m!: 1 n,s: 1 ' ;>;;„..,,„, ^J-. .«„«.... .... »-^?^^.^!.^ft 

7% inches 

96 DESICCATOR PLATES, Porcelain, glazed n„ one aide, with three pill feet and with holes 
30mm in diameter; for use in Sheibler Desiccators. 

12 3 4 5 

No ..- 115 14" 190 230 



1 
9.1 

3% 

3 

.90 



4% 

4 
1.02 



5 

1,50 



T 1 .- 



i 
2.40 



9 

8 

3.00 



ith 



Diameter, mm • • • ■ 

Diameter, approximate nol.es 

Number of holes 

Each 

380-2 DEStCCATOR PLATES, Porcelain. ,laz,.,l o„ on le, wltho.. feet, P«*.«lj- perfected ml 

small holes, 5 mm in diameter. 

140 190 230 

Diameter, mm 1.68 2.28 2.70 

Each 

3808. DIALYZER. BeU Glass or ^l^™?^^^^^^ X*. 

With pardnnent paper, suspended in glass jar. umm s 2QQ 

5x7 i DC lies 

1004,.. DIALYZER PAPEE, Parchment, of vegetable origin, median, tnickne*,, ta sheefcUiMineh* 

per quire .50 

17x22 i n<' lies. . .per sheet 3.75 

2.50 



10042. DIALYZER PAPER, Parchment, genuine animal product in sheets 
3814. DIAMOND for writing on glass, mounted is lu.nl rubber handle 

DIAMOND GLASS CUTTERS, see Glass Cutters. 
3816. DIAMOND INK for writing on .lass, in one ounce ceresine bottles 

DIGESTERS, see Autoclaves. 

173 



.40 



DISHES 



No. 3820. 



UENTBAL sriKNTll'ir 00., CHICAGO, I B. A 







No. 3822. 






No. 3824. 




No. 3828 



No. 3831. 






No. 3829. 



No. 3832. 



No. 3834 



fl 












3820 



I g oo 



3824 



3828. 



3829 
3831. 



3832. 



3834. 



3842. 



DIES. Figures, of steel, from to 9, for stamping steel. Imllion, Migratory apparatus, ■ i. 

Pace, inches % i 

Per set $1.20 2.00 

DIES, Letters, of steel, complete Bet from V t" '/.. and period, for stamping steel, bullion labors 
kory appa ral us, e( i , 

Pace, imhes ^ i 

Per set 3.40 5.75 



DISHES, ALL KINDS 






190 

.80 



1.10 



DIFFUSION SHELLS, single thickness, for us.- in osmosis and dialysis experiments. Th 
shells are superior to parchment pai-«>r .'ifher in sheets • •! tubing, because ol their conveni 
shape, and large amount of dialysing surface Length, LOO mm; diameter, 10 mm La boxes 

?j 25 shells per box 6 00 

DISHES, Acid, Bee Mo. 3785. 

DISHES, Aluminum, for milk analysis, Bee No. 3850. 

DISHES, Crystallizing, ,,f 1 1, in blown glass, with flat bottom, straight sides, and ground eases 

No A AA g C D E ~ V 

Approx. diameter, mm 50 60 ^n 100 12 150 

Approx. depth, mm 35 fo -,, , ; - 7 - 

EacD ; ft -,- •-•, 16 - 18 -20 .26 .36 .50 

10' , discount in lots of 12, 20'; discount in lots of 144. 
DISH, Crystallizing, for Tan Liquors, see Mo. 3873 
DISH. Evaporating Copper, ::' . inch in diameter, 200 cc 
DISHES, Culture, see Culture Dishes. 

DISHES, Evaporating. Pyrex Glass, flat bottom, heavj walled, win, lip; may be used instead of 
porcelain. 

No 

Diameter, nun 

Eeight, mm 

Each 

D ^"fV^ i n^S C ?° rS .^"^wUhjip; glazed Inside sad outside ap to No. 4A; large, 
sizes glazed inside, bnt only partly outside. 

; Nn 000 00A 2 3 1 \ ,; ft Q 

Diameter, mm ,;., 75 90 ,„„ 4A 6 8 9 

Capacity, ,.,. -.-, - (l U(| 

tacn u 03 4 r> , Q 



A 

Ml 
J.'. 

.35 



B 

:«ii 
;.ii 

.40 



115 
250 

.60 



385 

.84 



«' 
1 1 (5 

.45 



8 

2 1 5 

1 285 

1.44 



D 

1 25 

65 

.75 



I'll.'. 

2200 
2.16 



Diameter, mm 



11 

Approximate capacity, cc -■-'''[ 

Each ; >'"" 

6.40 



12 
400 
10000 

14.40 



13 
460 
165O0 

24.00 



No ' • Bor '\ v wruinarv reagents 



l>ium<-tc*r, iiiiii 



■ *«-§ * t ■■ , mm '• 

A" * • • , nj 

pproximate capacity, cc 

Each 4- 



B 

25 

r, 

1 .50 



rv reagi 

c 

82 

30 

80 

1.65 



E 

98 

30 

100 

2.15 



F 

10s 

44 
200 

2.50 



174 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



DISHES 





>' 



ir 



11.20 i 



3.« 






I mm. Iika 
- per box u 



B 

i" :• 
■' 



U 

C 5 
1(6 

■ 

.15 ' 



9 



. 
1285 

IS 

« 



10 



■ 
100 



f 





,«*! 



No. 3844B. 



No. 3846. 





No. 3850. 



No. 2108. 




No. 1820. 



No. 1821. 



No. 357. 



No. 830. 



No. 3858. 



3844B DISH. Graniteware, flat bottom, with sloping si.l.-s. A,.,.r.,ximate diameter, is cm; ...:..... 
racturers rated capacity, l quart $021 

DISHES, Iron, see Sand Baths. 



$0.20 



3846. 



75 
.14 



1 1 11 1 
.18 



3850. 



B 


C 


I) 


65 


75 


100 


15 


20 


25 


.20 


.25 


.30 



2408. 



1820. 



1S2I 



3So6. 



DISHES, Lead, fox use with hydrofluoric acid in etching glass. 

I tiameter, mm gn 

Each ' ............. ...... .09 

10',, discount in lots of 12, 20',; discount in lots of 144. 

DISHES, Milk, Aluminum, with straight Bides and flat bottom 

No A 

Diameter, mm 50 

Depth, itim [2 

Each '.'.'.....'..[] .15 

IO9; discount in lots of 12. 

DISH, Milk, Coors Porcelain, with straight sides and flat bottom, glazed inside and outside 
Diameter outside, 69 mm; depth, 13 mm; capacity, 25cc 42 

DISHES, Moisture, Aluminum, with cover of same fitting outside. Cover can be fitted 00 bottom 

to keep parts together when dish is open. Extensively used in s.»il laboratories for determin 

ing moisture. 

No A B C 

I >iameter, mm :.o 63 89 

Height, mm _ ■ u 

Ea*h 25 .40 .60 

1095 discount in lots of 12. 

DISHES, Moisture, Aluminum, same as No. 1820, but with dish and cover numbered to agree. In 
ordering please state what numbers are desired. 

No A B C 

Each 35 .50 .70 

10',; discount in lots of 12. 

DISH, Moisture, Aluminum, with flat bottom, sloping sides, and inverted cover fitting tightly 

on inside. Diameter at top, 55 mm ; height, 15 mm 35 

10', discount in lots of 12. 






3.S0S. 



DISHES, Nickel, spun from pure sheet, polished; round bottom, with lip. 

No B C 

Diameter, mm 60 80 

Capacity, cc 100 200 

Each 1.40 2.00 

357. DISH, Nickel, Evaporating, with handle, as used by the Barrett Company in testing bituminous 
materials. Also used for drying in sugar analysis. Diameter, 54 mm; depth, 14 mm 2.10 

830. DISH, Nickel, Weighing, for Sugar, with spout and counterpoise. Diameter of dish, 80 mm; 
total length including spout, 120 mm; depth, 40 mm. Highly polished, with brass counter- 
poise. (See Browne 's Handbook of tiugar Analysis, Page 203; 6.00 

175 



' 



tfflSl 









DISHES 



CEKTBAL 8CIENTIFK CO., CHI< m:Q, U. K. A 




C 






No, 38G0. 



No. 38i 



J 




No. 38G8 







No. 3870. 



No. 3872. 



No. 3873 



No. 3874, 



;isi.in. 



:«'. 



:-;s.;s 



DISHES, Platinum, see Platinum Ware. 

DISHES. Preparation, of clear whit< glass, low form, with loose fitting eovi 

No x 

Out side diameter at bottom, mm ;,,. 

Height, including cover, mm 

Each $0.30 

10' , discount in lots of 12. 

DISHES, Preparation, Steiider Dishes, with groov< .1 covers ground t<- tit. 

No A B C D 

Outside diameter at top oi dish, nun ;,u 60 

Height without cover, mm in 25 28 90 

Each 22 .26 .40 .40 

10' i discount in lots of 12. 

DISH. Staining, of glass, witb cover and grooves to hold ti □ 3 inch slides, Length outside 
inches; width outside, 2% inches 40 

10' , discount in lots of 12. 



3870. DISH, Staining, Enibryological Cup. ,,t solid glass with concavity in center, with one surfa 
ground for writing. Dimensions 38x38x17 mm, with concavity 33 ram in diameter and 11 mm 

dee P 12 

10', discount in lots of 12. 

DISHES. Staining. Syracuse Watch Glasses, see Watch Glasses. 
STAINING JARS, Bee Jars, Staining. 
DISHES. Stender, Bee Dishes, Preparation, 

3872. DISH, Sugar, Opaque Fused Silica, Hat bottom, without lip. Diameter, 51 mm ; depth in center, 

25 nun ; approximate capacity, 40cc 1.65 

3873. DISH, Tan Liquor, Pyrex, with fire-polished edge, for use in the evaporation and .hying of residue. 

in the analysis of tan liquors. Diameter, 70 nun; height, 50 ram; weight, approximately, 
grams. (See Official Method of the American Leather Chemists Association Cor the analysis 
oi \egetable Materials Containing Tannin, Vol. IV, page 21.) •« 

3874. DISH, Tannin, Opaqne Fused Silica, flat bottom, without lip. Used also for ashing coal. Diam- 

i-tn-.v mm; depth ,n e,..ter, 25 mm; approximate capacity, 75 cc 1-65 

DISHES. Weighing. B ee Balance Weighing Scoops. 

176 




L^H 



i i 



■ ■ 




i hat 








»0.38Tj 



L 



ft 

.« J: 



. 



' 



;.Jeptk»*Ji 



rvit,: 



• ■ 






,.c?^ „ 



CENTRAL SCIENTIFIC CO, CHICAGO, U. S. A. 



DISSECTING 




No. 3902. 



No. 3908. 




- — >* -ojjiii 



miasm — 



No. 3904. 




i-^jiji 



No. 3912. 




No. 3906. 



No. 3911. 



, Cfin „ M DISSECTING INSTRUMENTS 

3S80. blowpipe f or zoological work, nickel-plated, 125 mm long $022 

Qfloo BTAMrnTTlt1 . l ° r ' discount, in lots of 12, 20'; discount in lots of 144. 

d»8-. BLOWPIPE tor zoological work, nickel-plated, 188 mm long with very small orifice; especially 

suited for very small vessels 35 

10' ' discount in lots of 12, 20'/, discount in lots of 144. 

3884. BRISTLES, shoemaker's. Extra quality; useful as seekers Cor tracing out fine ducts ami vessels 

3888. FORCEPS, Artery, Dressing Forceps, of steel, nickel-plated, with corrugated jaws. Length, 
115 mm n 20 

3890. FORCEPS, Artery, Dieffenbach's, self-closing, of steel, niek.l-plated, with i' corrugated curved 
jaws, Length, 60 mm 70 

3894. FORCEPS, Bone Cutting, of steel, nickel-plated, very heavy, and strong. The blades ; fit accurately 
and are easily separable for cleaning. Length, 190 mm 3.20 

3896. FORCEPS, Bone Cutting, of steel, nickel-plated, with strong curved blades. Length, 100 mm 

3898. FORCEPS, Dissecting, Fine, of steel, nickel-plated, with smooth handles; fine, straight, smooth 
points. Length. 110 mm 15 

FORCEPS, Dissecting, Fine, of steel, with smooth handles; fine, straight, smooth points. Length, 
95 mm ,25 

FORCEPS, Dissecting, Fine, of steel, nickel-plated, with smooth handles; fine, curved, file-cut 
points. Length, 120 mm 55 

3904. FORCEPS, Dissecting, Fine, of steel, nickel-plated, with corrugated handles; fine, straight, file- 
cut points, with guide pin. Length, 115 mm 50 

3906. FORCEPS, Dissecting, Fine, of steel, nickel-plated, with corrugated handles; fine, curved, file- 
" lT '"' ints - witD g«ide pin. Length, 115mm 60 

■*908. FORCEPS, Dissecting, Medium, of steel, nickel-plated, with corrugated handles; medium fine, 

. rt raig nt, corrugated points, with guide pin. Length, 115 mm 60 

•J912. FORCEPS, Dissecting, Heavy, of steel, nickel-plated, with corrugated handles; heavy, straight, 
corrugated points, with guide pin. Length, 115 mm 55 

-J914. FORCEPS, Dissecting, Heavy, of steel, nickel-plated, with corrugated handles; heavy, straight, 

file-cut corrugated points, without guide pm. Length, 125 mm 50 

FORCEPS, Blowpipe, Cover Glass, Pinning, Weight, etc., see general heading, Forceps. 

Note— 10% discount in lots of 12, 20% discount in lots of 144. from list prices of forceps Nos. 3888 to 
3914, 



3900. 
3902. 






177 




























DISSECTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A 




No. 3924. 




No. 3928. 




No. 3920. 





Nos. 3962-7. 



ri\ 



•' i 



t 



A B C H No. No. Nos. No. No. No. No. No. N „ Q9fi 

No. 3971. No. 3951 (full size). 3932. 3934. 3936-8. 3940. 3942. 3944. 3946. 3948. 05raK 

3920. HOOK AND CHAINS, triple books, nickel plated, with sharp [mints $0.35 

'■'.'-I KNIFE. Cartilage, ;ill steel, nickel-plated, corrugated handle; 50 nun cutting edg< Total length, 

165 mm .55 

3926. KNIVES, Cartilage. Heavy, Prosecting Knives, with heavy steel blade, extra thick at back, set 

in ebony handle. Length <>f rut t ing clgr, mm 70 90 

Each 1.65 2.00 

3928. KNIFE, Cartilage, Large, all steel, with flat ground blade. 135 nun long. Suitable for cartil 

work and large dissections. Total length, 250 nun 3.20 

10' , discount iu lots of 12, 20' , discount in lots of 144 from Nos. 3920-24-26 28. 
3932. NEEDLE. Dissecting, of steel with plain wood handle II 11 mm long; with straight sharp jiuiut. 

Length, L30 nun . r.er dozen .45 

10' i discount in lots of 111. 

3934. NEEDLE, Dissecting, same as No. 3932, but with benl sharp point per dozen .50 

10' , discount in lots of 144. 

3936. NEEDLE, Dissecting, besl quality, with curved sharp point 30 

3938. NEEDLE, Dissecting, Bame as No. 3936, bul with curved blunt point. .30 

:; '"" NEEDLE, Dissecting, Bame as No. 3936, bul with half spear point 50 

.50 
.70 

shaped T..7T 50 

3948. NEEDLE HOLDER, of brass, nickel plated, with screw chuck, with one 'straight net dli Length, 
oo m m jo 

3950. NEEDLE HOLDER, same as No. 3948, bul with one bent needle 42 

oori vrrmic ' discount in lots of 12 « 20% discount in lots of U4 from Nos. 3936-50. 
395L NEEDLES, of steel, for use with Nos 3948 and 3950 Holders, Length, 50 mm. 

Style A ' ,. c p 

p""\" ;,s straight spear bent hook 

I,r,1,,/en 10 .50 .50 

10' , discount in lots of 144. 
Saxt £■ J° r sh . a [P enin g. senilis and knives, see No& 9608 to 9612. 



■ ■.•<'• i* c*z*u la**, dissecting, Bame as no. s»3o, hut with half spear jMunt 

3942. NEEDLE, Dissecting, will, full spear point, with double cutting edge 

3944. NEEDLE. Dissecting, with bar] n shaped point, with t\%.. cutting edees 

39 16. NEEDLE, Dissecting, hook shaped 



.50 



3962. PAN Dissecting, of heavy tinned metal, japanned, with metal loop's for fastening limbs of ani 

QOfi „ mate dur.n« disse.-t i«.n. Dimensions, 290x190x30 mm deep 41 

^y^e W p?S. 8ame .^ N °" 3962 « 1,Ut " Uh b0tt0m ' " v ' red With Witt, to which small object 



3966. PAN, Dissecting, of seamless agateware. Di 



40 

s 

.50 



'■.'•- paw-' t™" 1 "*- UI wanness agateware. Dimensions, 300x200x3(1 mm deep 40 

•'" ^^TESt?"* " N ° 3M6 ' but with , '"""»' -.n,. wnh, '.rk, !o whiih inaU objects 

lO^c discount, in lnt\« «f 10 +-^. *r„ ' wu^J'Jim 



RAZORS, Section. 



see 



discount 
Microtome 



in lots of 12 from Nos. 386247, 



Knives 



3074. SAW, Bone, of steel, nickel-plated, parts s,,,ara,l, lor BteriJ 



total k-iigth, 300 mm 



tzation. Length oi blade, 200 mm; 

3.75 



17$ 








ft Hi,.. 

«. mr m \ 
is 

dp. talM 

thick it code 

:■ . 
btt ivaA 

. ...a 

- 

perdoa J| 
J 

.. J 
J 

. J| 
j 

i 



w*"3 



CENTRAL SCIENTIFIC CO., CHICAGO 



, U. 8. A. 



DISSECTING 




Nos. 3984-8. 




No, 3980. 



No. 3982. 



(' 
No. 3996. 





No. 3990. 



Scalpels are carried in throe grades. 
Grade C is made from a good grade o 



SCALPELS 



39xo. 



for the ordinary elementary laboratory work of the student 
t.rade I is made from carefully selected steel evenly honed. 

need laboratory work by either stud< 

best English st'eH, tempered with the 
boned. They will take and retain ai 
»s. They can be used in the most pre 

SCALPELS, REGULAR SHAPE 



f steel, carefully ground and sharpened. They are suitable 



Gr'X l fi. 1 ! ,, 'T ,,, 'f : ;; K T , ''^ i . :,, T^ ,,ryw,,r,< by either student or inatructnr; 
Grade A ,s made of the best English steel, tempered with the greatest care 



They are well finished, and can be 



low ground and finely honedT'The/^l take'Vnd' ZXSttgZSZ toSS*" "" k * 

mosn jehea to dissections. They can be used in the most precise wort intoe pri£!e 



edge such as is demanded for the 

or rosea rch 



3982. 



3984. 



SCALPELS. Grade C, with black wood handles. 
No 

Length of rutting edge, mm 

Each 

SCALPELS. Grade C, all steel, easily sterilized. ' 

No 

Length of cutting edge, mm 

Each 

SCALPELS, Grade B, with ebony bandies. 

\o 



3988. 



1990. 



Length of cutting edge, mm 

Each ; "" g 

SCALPELS, Grade A, with ebony bandies. 

No * A 

Length of cutting edge, mm 25 

Each ' g 

SCALPELS, Grade A, all steel, easily cleaned and sterilized. 

No ^ 

Length of cutting edge, nun 25 

Eac « '.'.....'.'.....'.'.'.'.'.'.'..'.'..'.'.'.'.'..'. .80 

wir QftA SCALPELS, SPECIAL SHAPES 

••••■">. SCALPELS, Grade A, with ebony handles. 

s, . vl '' B 

Lengt h of cutting edge, mm 35 

Ea<:1 i .80 



< 

.60 

C 
38 

.80 

C 

38 

.80 



B 
38 

$0.30 

B 
.38 
.55 

D 
45 
.60 

D 
45 
.80 

D 

45 
.80 



c 

35 

.80 



Note— io% discount in lots of 12, 20'.; discount in lots of 144 from ail list prices on this page. 

179 



D 
10 

.80 






I 











SCISSOKS 



CKXTK 



Ai. sni:\Tiri«' 00., CHICAGO, P. a A. 





No. 4010. 




No. 4030, 



i 










4IKIL* 



•mm 



4006, 



4008, 



4010 



4012, 



4022. 



4030, 



SCISSORS, DISSECTING 

Dissecting scissors are carried in two graces, A and I', and in three degrees oi fineness, desig- 
nated as fine, i linm and heavy. 

Grade I'. s.-issors aro made of ordinary cutler] steel, and are suitable for ordinary student labora- 
tory work. 

Grade A scissors are made of the best grade of cutlery steel, nickel-plated, and are suitable for 
precise and delicate work in the advanced and research labo atory, 

SCISSORS. Grade B, Heavy, nickel -plnied. with sciew lock, with straight, sharp points. Length, 

125 ...... $0.50 

10'i discount in lots of 12, 20' % discount in lots of 144. 

SCISSORS. Grade A. Fine, with screw lock. Fine, straight, sharp points. Length, 110 mm. .80 

10'; discount in lots of 12, 20' [ discount in lots of 144. 

SCISSORS. Grade A, Pine, wit li screw lock. Fine, sharp points, curved upwards. Length. 

1 in mm 1.00 

10% discount in lots of 12, 20', f discount in lots of 144. 

SCISSORS. Grade A, Fine, with screw lock, line, sharp points Lent at angle to side. Length, 

11" i. mi 1.25 

10' ; discount in lots of 12, 20' ; discount in lots of 144. 

SCISSORS, Grade A. Medium, with screw lock. Medium fine, straight, sharp points. Length, 

115 mm ,80 

107c discount in lots of 12^ 20% discount in lots of 144. 

SCISSORS, Grade A, Heavy, with screw lock. Heavy, straight points, one sharp and one blunt. 

*" V, ■ A C D 

Length, mm ,.,- ,-,, i;;, 

Eacn i io 1.20 1.50 

10', discount in lots of 12, 20% discount in lots of 144. 

SCISSORS, Grade A, Heavy, with slide lock. Heavy straight points, one sharp and one blunt 

iT'i: 1 ''• mm 115 125 

Eacn 100 1.40 

107 discount in lots of 12, 20% discount in" lots of" iii." 

^lf^^nnT' 6 ^ 6 ,. 01 ? 6011116 ' for the m08t delicat « ™ rk - Vary fine, aharp points, witt 
all metal handle. Length oi cutting edge, 10 mm; total length of seissck 140 ...... '.! 4.00 



ISO 



1 H 1 


K 


^H 


J- t 



n 



• « 




MIX 



w of isan 



- 



Ud IR :.V: 



[I .:•■. 



tutfi 



upwards. 



>lt to afe 






mM 



hu| 



io.i ■ 






'? 



ait* 
' LOO 



• . • 



rt r* 



If 



CENTBAL SCIENTIFIC CO, CHICAGO, U. S. A, 



DISSECTING 





No. 4036. 




I 



No. 4038. No. 4044. No. 4046. No. 4048, 




No. 4054. No. 4056. No. 4064. 




No. 4060. 
Z SECTION ™p' "*' G , er " ,a " S " Ver ' Wi,h bli "'° ""« — "*" """"• ""' - «* 

£ sbSon ss "■;;■ "!"" ,v r"":!' "" th ' m - ^^"--^ ,;<;,,, „,„. wiJe 2 

^taS^s. m ^.? b r B f. haB . d ? e . a,,d .!. erfo ™ t . e . <i bmvi 18 • ■ ■" ""• "» •""■j'-s 

SECTION RAZORS, sec Microtome Knives 6 ° 

6 - s ^^,^l!^l^;:!; ;;;;^: pIatod : w : th .^;— . j ! int ; . . — n : ;;•; ;;- f ■ - *» « -y 

4064. TENACULUM ebony handle, steel shank, with tapering sharp hook. Length 160 mm 55 

10' /c discount in lots of 12, 20', discount in lots of 144 from list price Sl&. 403*4064.' 

DISSECTING INSTRUMENT CASES 

4072. DISSECTING CASE, Leatherette, of best quality hrown leatherette, almost equal to leather in 

idstener, and loops for 6 instruments F 35 

W% discount in lots of 12, 20' ; discount in lots of 144. 

40,6. DISSECTING CASE, Morocco, ,,f genuine morocco leather, two Cold, lined with velvet, and hav- 
ing CAamoia flaps, button fastener, and leather U.ps tor 11 instruments 2.50 

10' /( discount in lots of 12. 

40,8. DISSECTING CASE, Morocco, similar to No. 4076, hut three-fold, with loops for 17 instruments 

• • • • •••• .,,,. ....*., 3 en 

lO'/t discount in lots of 12. 

181 






I 



I 



A 















DISSECTING 



CBNTBAL sriKNTiric CO., CHICAGO, P. 6. A. 




No. 4066. 




_.»F 



■ - 



........ >-f«V • 





No. 1098. 



No. 1100, 



DISSECTING INSTRUMENTS IN SETS 



The following sets have been made up of the instruments which havi proved mosl popular for work 
'" botany, oology^ anatomy, and histology. We will make up special sets to meel anj requirements, 

es in i be precedi ng list. 

T, consisting of No. 1072 Bingle fold Leatherette Case, with the following Grade 
nents: No. 3898 Poceps, No. 3932 Needle, No. 3934 Needle, No 1980B Scalpel. 
■s and No. F66] Bule 145 



using preferably the cases in the preceding list 
DISSECTING SET. 
I '• and < ' lustrum 
No. 1002 Si issora 

10 '' discount in lots of 12. 20', discount in lots of 144. 
■him,. DISSECTING SET. consisting of No 1072 single fold Leatherette Case, with tb. f..ll..wintf Gm.Ip 

nstruments: No. 3898 Forceps, No. 3948 Needle Holder No 3950 Needle Holder, 



1090. 



In'.iO. 



No. 3980B Scalpel, No.- 4002 Scissors, and No. F661 Rule ,'....'., ..... ' 1.60 

mccrr-Trvr. *™ l0< ' * iscwmt in lots of *2, 20 | discount in lots' of' 144* 

dissecting SET. consisting of No. 1072 Bingle fold Leatherette Case, with the following Grade 
B "-truments: No. 3904 fc«n.-, M ,s. X... :\wg Forceps, No. 3948 Needle Holder, No. 3050 Needle 
Holder, No. 3984( Scalpel, No. 4004 Scissors, and No. F66] Rule 3.15 

mcorr-P 10 '' discount in lots of 12. 

ng SET, ...msisting „f \., l0 76 two-fold Morocco Case, with tl.r following Grade A 



j»trnmenta: No. MM Forceps, No. 3906 Forceps, No. 3924 Cartilage Knife, No. 3948 Needle, 
Kis^ 



ini's. 




1100. DISSECTING SET. Anatomical 



10' , discount in lots of 12. 



Grade V instruments- w^o^i, Ug "' No ' ,,,7,; two-fold Morocco < !ase nn.l t ho following 
3924Carti lag K Tf No^? ^v,,,,,.. \„. ;;■„. Forceps, No. 3890 Artery For,,,.*. N«. 
M88CScXf \ ' -".Mr s , S* ^ 6 " !£' J? 56 Seekei ; "" 1 '' enaculum, No. 3988A Scalpel, No 
N„. F661 Rule l "' 1, No ' t012D Scl88ore > »«■ ••'•'-" Triple Chain and Hooks, and 

, , Q 75 

10 4 discount in lots of 12. 



1S2 



^^ 



CENTRAL SCIENTIFIC Co., CHICAGO, U. 8. A. 



DISTILLING 



iL% * 



■ 
hit rnjiintt| 



J\ 



■ 
follofiaj! ft* 1 






r«3 
d and H*° 

,,v F • 




" if 



4124. 
4125. 



4124. 



No. 4120. 




No. 412±A. 



DISTILLING APPARATUS FOR WATER 

Note:— Tlu» U. S. Internal Revenue Office requires that 



No. 4125A. 




4120. DISTILLING APPARATUS. Acme Automatic Water Still. 




DISTILLING APPARATUS. Barnstead Automatic Water Still, the standard outfit for produc- 
ing chemically pure distilled water for laboratory uses. The internal construction is shown in 
the illustrations above. The raw water entera at A and flows around the steam pipe in the 
condenser, cooling and condensing the Bteam an.! at the same time being heated by the latter 

to a sufficiently high temperature to drive off the dissolved amm a and other gases which 

escape as the water flows into the ..pen pipe at P. This pipe connects with the boiler into 
which the water enters and ia quickly converted into steam by the gas or electric burner. The 
strain thus formed passes up through the threat <; and into the condenser. Pure distilled water 
tree from dissolved gases, is discharged at B. The rate of How of cooling water should bo 
regulated so that it becomes as hot as possible in the condenser without permitting any large 
amount of vapor to escape uncondensed at J. The top of the still and attached condenser are 
easily removed by turning the thumb screws at the top, permitting easy access to the boil' r 
for cleaning. 

In the gas-heated type a very effective radial burner of generous size is enclosed in the base 
beneath the tubular boiler, thus minimizing the loss of heat. As a result, with gas costing 

$1.IMI per thousand cubic feet, distilled water is produced at the very low rate of 1%C per 

gallon. In the electrically-heated type cylindrical electrical heaters project vertically into the 

boiler where they are completely immersed, thus yielding practically all of their heat to the 

water. They will last indefinitely, and, when necessary, renewals may be obtained and are 

easily inserted by the user. 
The stills are built of heavy copper, coated inside with pure block tin. All parts are beautifully 

finished and nickel-plated in the one and two gallons sizes; the five -gallon size ia galvanized. 

.Stills are provided with short legs for standing on the table or on a shelf. Dimensions arc 

given below for the various sizes. 

No A C D 

Capacity, gallons per hour 1 2 5 

Height, inches -4 -«', is 

Dept h, inches 8 '• 13 

Width over all, inches 18 18 24 

Energy consumption of elcctricallv heated type, kilowatts ... . 2.4 6 

Each, with electrical heater '. 75.90 121.00 

Each, with gas burner 60.50 96.80 165.00 

Note: — In ordering electrically heated stills, be sure to state voltage. Note also tlu.t special 

wiring is required on account of the large current consumed. 
Extra Heating Units, Electric, for No. 4124 Barnstead Stills. 

No , r G 

For .still No. 4124 V ** 

Number of units required for complete still J J* 

Each . 65 ° 9 ' 00 

Note: — in ordering, kindly specify voltage. 

183 









DISTILLING 



CENTRAL SCIE 



vrnic CO., CHICAGO, r. 8. A 

















? 
















„ 

T 

No. 4136 (shown mounted Jf -~**» 

on wall bracket). No. 4142. No. dl38. 

4136. DISTILLING APPARATUS, Peerless Automatic, with boiler *n shaped thai the steam is forced 
through the watt to its eentei where it passes in a compact body into the condensing tube, 
thus reducing the amount of condensation on the Bide walls of the still, and producing dis- 
tilled water at a very low expanse for g:i-s. Tin parts are readily accessible for cleansing. The 
boiling vessel is of cast iron and not easily burned out or injured by rough handling. The 
condensing tube is of heavy tinned coppei, sufficiently large to ins. ire pertYet condensation 
with a very small stream of water. Finished in aluminum bronze and lacquered brats. With 
gas burner. Withoui wall bracket. 

No... A B 

Capacity, gallons 1 3 

Dimensions, inches 24x18x12 26x26x16 

Shipping weight, pounds 10 60 

Eaca • • $25.00 50.00 

2222. Burner, Kerosene, for use with No. 4136, when gas is aot available 7-00 

4138. DISTILLING apparatus, Ralston's New Process. May be used on any st and does not 
require water under pressure The storage of the distilled water within the still preventatha 
reabsorption of gases. Although not entirely automatic, it is so constructed that it cannot boil 
dry; it requires little care or attention. It is mad.' of copper aud pure tin. apacity, from 
1 to 3 quarts per hour, depending on the amount of heat used. Weight, 7 lbs.; diameter. 9 

inches; height, 14 inches 15.00 

4142. DISTILLING APPARATUS, Stokes Automatic, steam heated! These stills have' t m i features which 
render them unusually effective in the production of pure distilled water. First, they utilize 
the heat generated in the still to preheat the incoming water to the boiling point, thus requir- 
ing a very emal quantity of live steam to keep them in operation after once started. Second, 
by preheating the feed water before it enters the distilling Chamber ammonia and other gases 
are liberated and permitted to escape into the atmosphere through an opening in the condenser 
Provided tor this purpose, preventing their reabsorption bv the distilled water. The distilling 



Xm^wSel' anda^l -""I ™ f^^C^^^ the two conncctionlTor 

of St leas? 27pound? PP Teady % ° * Qp " Ca P»^« are based on a steam pressure 

NO . _ j, 

<'apaeity per hour, jralluns. '.■;.';.'.*;; .,£ '- in 

Beight, feet . ' - » •' JX 

Weight, pounds "' f£ 

Each u '10 275 325 

30.00 75.00 150.00 200.00 

181 






^ 



^nresu 



u>»> 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



No. -ua 

•■ 

aa-J pro, 
for (to: . 



J 



■ 

that it oW* 



d «»p- 
1 lh«.; *■* 

point, tin "J 

i, ltd *t*£ 

gin ike *g 

lily ** "32 

'• Th,n 2fl 

... 



C 

» 

3k' 
Uft« 



. 



4144 



4148, 



4149. 



4152 



4153 



4158 



DISTILLING 





No. 4152. 




No. 4153. 



No. 4144. 





No. 1148. No. 4158. 

DISTILLING APPARATUS, Stokes Automatic, of same general design as No. 4142, but with 
double burner for illuminating gas. Capacity, :l i gallon per hour. Height, 24 inches; shipping 
Wdight, 50 pounds. With bracket for attachment to wall $27.00 

DISTILLING APPARATUS FOR SPECIAL USES 

DISTILLING APPARATUS, copper retort, tin lined, with removable head, connected with pure 
block tin condensing worm, enclosed in zinc vessel, with proper inlets and outlets. 



A 

15.50 



'.. 



9.00 



B 

1 
20.00 

B 

1 
12.50 



•_• 
24.40 

C 

'_' 
15700 



D 

3 

32.75 

D 

3 

19.75 



E 
5 

37.75 

E 
5 

22.50 



No. 

Capacity, gallons 

Each 

RETORTS only of No. 4148. 

No 

( lapacity, gallons 

Each 

CONDENSING VESSEL only of No. 4148, see Condensers No. 3240. 

DISTILLING APPARATUS," for the destructive distillation of heavy oils and other liquids or 
solids requiring a high heat. The distillation may be made by live steam or by direct heat, 
with or without agitation by hot air blown through as desired. The still is of heavy copper 

with brass titi nig-:. Capacity, l <- gallon 20.00 

DISTILLING APPARATUS, similar to No. 41 oU, but larger and heavier, with cover bolted on 
and jointed delivery tube. 

No ' A B 

Capacity, gallons 1 2 

Each 30.00 46.75 

DISTILLING APPARATUS, Hortvet's, for determining volatile acids in wines or vinegars, de- 
signed by Dr. Julius Hortvet of the Minnesota State Food and Dairy Commission. (See Jour 
nal of Industrial and Engineering Chemistry, Vol. I, No. 1, for January, 1909, page : l.i 6.00 

185 


















DISTILLING 



CKXTKAI 



S) ., i:NT ii'W CO, CHICAGO i 6 A 




No. 41(12 



No. 4166. 



No. 1164. 



No. 4192 No. 4194. 





Ih- 




No. 4173. No. 4174. No. 4176. No. 4180. No. 4186. No. 4188. 



4162. 



No. 4168. No. 4170 No. 4172. 

the determination of the per- 

ili nli-ohol lamp, 
S16.75 

DISTILLING apparatus Por the detenu ination oi wnmonia in water, see Water Examina- 
tion Apparatus. 
4164. DISTILLING 



DISTILLING APPARATUS. Salleron's. of copper, for 086 in the deternunati. 
rentage of alcohol in wine, beer, cider, etc. Capacity, , pint. Complete .wit 
hydrometer reading from to 35 degrees Trail.' and 1 ■ graduate! cylindei 




1 1 66. 



Note: For Water' Bath for use with No. 4164, Bee No."14262, 8 Inch. 

DISTILLING RECEIVER. Bruehl, for use in collecting successive fractions in vacuum distilla- 
tion. Especially valuable in organic laboratories and in petroleum and creosote oil work. The 
seven glass receiving cylinders, 30x120 mm, are held in a revolving metal support which can be 
turn.. i to bring each vessel in turn under the delivery tube by means "i a ground-in glass 
tube. A delivery tube is ground in the upper tubulature, in which the end of the condenser 
may be fastened by means of :i rubber stopper. A Btop-cock in the lower tobnlature provides 

Connection to the vacuum pump. Diameter of glass jar, l.~>0 nun; height over all, 270 nun. 

Complete as illustrated with 14 receiving cylinders 15.00 

DISTILLING TUBE, for fractional distillation, plain form; length, 9 in.; diameter, T * in. .35 

10' ; discount in lots of 12. 
DISTILLING TUBE, with one bulb? length, B inches; diameter, T v inch -45 

10' , discount in lots of 12. 
DISTILLING TUBE, with two bulbs; length, 10*6- inches; diameter, T . inch - 50 

10'; discount m lots of 12. 
DISTILLING TUBE, Pyrex, especially valuable because of its heal resisting quality Length, 
12 inches; diameter outside, about 1 inch 

DISTILLING TUBE, Glinky's, with glass valves. Length over all, 15 inches 

DISTILLING TUBE. Hempel's, filled with -lass beads. Length over all, 16 Inches 

DISTILLING TUBES. LeBel-Henninger's. 

No B 

Number of bulbs 3 

Each 1-80 

use. DISTILLING TUBE. Young's Form, Unproved, with 20 disks ami 21 constrictions. Length over 



4168. 


417o. 


4172. 


1173. 


4174. 


117'-.. 


4180. 



1.00 

2.00 
2.50 

D 

6 
3.50 



LI 88 



4102, 



all, L8 inches 
DISTILLING tubes, with pear-shaped bulbs! 

No 

Number of bulbs 

Length over all, inches , 

Each 

DISTILLING TT 
DIVIDER. Plain 



4.00 



s. Length, 4" ... inches 



petroleum, see Oil Testing Apparatus 



4194. DIVIDER, Spring. The popular Yankee polished steel spring divider, 3 inches long 



A 


B 


4 


12 


10 


20 


2.00 


4-50 
.45 




1.20 



is-; 



CENTRAL SCIENTIFIC CO., CHK'AdO, U. S. A. 



DRAWING 





No. 1215. 




No. 1-04. 



No. 1218. 





No. 1220. 



No. 1222 



DRAWING INSTRUMENTS 



4200. 



DRAWING BOARDS, pine w 1. with side ledges clamped. 

No 



Each 



A 


B 


16x22 


20x24% 


$2.00 


2.50 



4204. DRAWING DIVIDER, steel spring bow divider. Metal handle, steel points; length, ::■■ inehea. 

10' A, discount in lots of 12. 
DRAWING INKS in the following colors: blue, brick red, carmine, gre«, & S £Z£lJ!£ rvn & 

black 

In ordering please state the color desired. 

DRAWING INKS in oicely finished hardwood tray. Choice of five different "^iiel *** ™J 

list under No. 4214 

In ordering please state the colors desired 



1214. 



4215. 



L218. 



DRAWING INSTRUMENTS for elementary work, of brass, in, rfoth cover ed case 1^ ed m th ve 
,,,. Contains ruUng pen, 5-inch; compass, 4 %-inch, with fixed needle point, pen and pera 
points and lengthening bar; and plain dividers, ..-, -inch 



el- 

I 
85 



10% discount in lots of 12. 



1220. 



WING INSTRUMENTS, of German silver with steel points, in cloth covered case fined with 



DRAWIN 
point 



10% discount in lots of 12 



4000 




187 













DRAWING 



CENTRAL SCIENTD1C 00., CHICAGO, I - 1 



ft 






a 




a 



No. 4221. No. 4226. 



No. 4230. 



No. 1236. 



No. 1244. 




No. 1242. 




No. 4246. 







No. 1252. 




No. 4248A-B 



4221 
4226, 

4230. 



4232. 
4234, 
4236 

4 242. 



4244 
4246, 

4248, 



DRAWING PEN, Bow. steel spring, with Bteel points and metal handle si 35 

DRAWING PEN. Baling, spring blade, metal bandle '35 



BLACKBOARD DRAWING INSTRUMENTS, a s,r of four pieces, consisting of a 24-i 
square, a 36-mch straight edge, a 24-inch triangle graduated in inch . and a 15> . inc 
tractor «_* 

STRAIGHT EI 
PROTRACTOR 

blackboard compass, .„■ u,„„i, i5 inches "lonftwith" crayon* holder' ud nihtefoot.'.' 
drawing PENCILS. Faber, polished. 



inch T 

h pro- 
per set 5.0C 

DGE only of No. 4230 1M 

""!• of No. 4230 2.70 

JO 

(1H 
.08 



No. . 

Each 



411 
.10 



RULE. Parallel, < I „ my. Length, 12 inches uo 

SCA ^ E : T : riang ? lai '; '"T"'" '•;"'•■.. '■'';"■ grated •"< i- Lnches'in 1 tfhij the "othi i ■'.' .rlges have 



TRIANGLES, Celluloid. 
No 



Longest ijide. inches t 



Each 



42.-.L', 



4 2 r,6 



T SQUARES, pearwood blade ami head, fine quality 
Length, inches .... • ' 



6 
.30 



B 

,:n\ .In 

B 
.50 



C 
15 

.40 



Each 



24 
.45 



D 
45 

8 
.50 

30 
.50 



t!S ' Btee J' t 0T drawin « "iw to smaller ai*es. lumbers are oot standard 

Note '-io disco mt n intl'^'ioV'"' *£***" ««*«•■ W,,ll h ° le * numbered from 1 to30.. 3.00 
note. 10 I discount xn lots of 12 from list prices of Nos. 1224, 4226 4236 and 4248. 



188 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



DRILLS 




No. 1258. 



No. 4260. 



No. 4264. 



i S; ■:. 



)>. •-• . 



• 



pel 









10 



i 



th* otkr i* 1 



ftfi 




No. 4272. 






No. 4266. 



RILL Hand, sin- -k eear length 10% inches, with 8 steel drill points from '•„. to >',, incn 
SmTVATO to K- S3R holds either Anted or ronnd shank drills. Fran, all steel, gri 

^DR^POINTS for" No' oK' pia* Vopd **£' ' wiy be"^^^ ^ Nos. 4251 




; ■ 


4282. 


■ 






3143. 


- 


3144. 


45 fl 

I 




in 





No. 3143. No. 3144. No. 4282. 

4258. DRILL, Breast, double gears, capacity of chuck to U-inch, two sped-; adjustable breast ph.t,. 
spin. Ik- runs in a hardened steel cone hearing .. . . .. .. ••■■••• ■ • ■ ■ ; • ; ■ ; ■ • " "• ■ •• • •'• ' " - ', 

4260. DRILL, Hand, single gear, length. 10% inches, with 8 sted dnil points f.,,,,, <,, ; to >W, ....h. 

50 

4201. EXTRA DRILL POINTS Cor No. wmv, pi" ro « u " ■»»"—■ ~» — ' Per set 50 

and 4264 Drills. In sets of eight, Me to n; 4 inches ....... ■_- • ...... ,••••• ■■ «J JJ f 

4264. DRILL, Hand, donble gears, two speeds, capacity of chuck to % uch, knurled nut, Wame_or 

malleable iron, japanned. • 

4266. DRILL, 

b 

4267. EXTRA 
4272' DRILLS,lFwis£ straight 'round shank, for wood or natal % -, % 

Diameter, inch** Me * %J J| ^ G 8 JJ .& .75 

Each ■ • • • • • • ■ • ' b*™k » stool wire eaee, mounted on neat 

4274. DRILLS, Twist, straight round shank. No* . tj,s» ub sU.1 J^ fof ^ ,„,,. 
iron base which can also be used as a Stubs Steel ana wire w«*s i 9QQ 

oratory shop ; • ■ • • • • • • • • • ' " " : " ' "•' ' " ' " | t V Vealcd in tubes. Mounted on 

DRYING APPARATUS, Tauber's, with 2 U tubes and 4 jars mtn mm 2Q 00 

boa rd as shown 

DRYING OVENS, see Ovens, Drying. CombasUon Apparatus.. 1.25 
DRYING TUBE, Vanier's, for zinc, as used in Iso. 3 13 ^ Van. er ^ Combustion Appar- 
DRYING TUBE, Vanier's, for sulphuric acid, as us.-d ... No-^«« 2 .00 

Fo^ other DRYING TUBES," see Calcium Chloride Jars. 
For DRYING JARS, sec Desiccators. 

189 






I 






EBULLIOSCOPE 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A 










No. 435L 



No. 4362, 









!.:.')1. EBULLIOSCOPE, Contassot (Patented), for determining directly without calculation the per- 
centage «it' alcohol in beer, wine, vinegar and other alcoholic liquors. The method used i> that 
of a comparison between tin- boiling points of pure water and the liquid under examination 
However, instead of reading the temperatures of ebullition from ;i fixed thermometer scale a 
movable scale i^ provided, which is graduated t<> read directly in percentage of alcohol by 

tt'lltllS. 

iii making .-i determination, a fixed amount of pun- water is placed in the boiler, the alcohol lamp 
is lighted :uii| placed under it and 1 1 1 « • condenser is damped in place As Boon as the mercury 
columu in the thermometer has become stationary the graduated scale is moved t" right or left 
until its zero mark i- opposite the end <>t' the mercury column. The scale i- tin n fixed in place 

by :i set-screw, the boiler removed an. I the water replaced with a asured amount of t l ■ . - 

liquid under test. When the mercury column lias again become stationary, its position on il»' 
scale indicates directly the percentage of alcohol in the liquid. 

The ebullioscope is accurate and reliable, being used officially in the government laboratories of 
Prance and other European countries Many of them are in succc iful use in this country. 
The complete directions, which arc furnished with the instrument, make it possible for anyone 
t.. become familiar with its use in :i short time They cover practically sverj application and 
contain precautions which preclude the possibility of errors tin.- 1.0 differences in altitude, 
changes in atmospheric pressure, etc. 

The instrument consists of a tin lined copper boiler with handle attached, which is inserted in a 
perforated jacket securely fastened to a., iron support stand. To the cover of tins boiler is 
attached the right angle thermometer of glass, i„i,| i, v a brass arm carrying the movable scale. 
f. "'! ,l,x condenser, provided with an outlet tube and a stop-cock for drawing 01 for regulating 
tne flow of cooling water, is also attached to the cover. The brass arm holding the movable 

scaie, the boiler e.over and the c lens,-, is mounte.1 to slide on a vertical support rod to which 

it may be clamped by means of a set screw. 

Tho outfit includes a small brass akdhol la,,,,, with two extra wicks, and a glass cylinder for 
n.c^uu,^ ti„. wa ter and the samples to be tested. All parts are of highly polished ami lac 
quered brass, exc-,,, the support stand which is of japanned iron. The instrument is well made 

ith ,'! m T ,, '" , t , " : "»" l; """"'- : '"-l presents a very aeal appearance. In wooden cat 
with complete directions for operation ami for the examination of the various types of 



43:»L\ 





H»0 



1 



1J^™^<^^ CHICAGO, U. S. A. 



ELECTRICAL APP 




No. F-W53 



Removable 
Coil System 



3h!itH|& 

- 



■I tamtl 

■'■' ■•■'■'■ ■ - 

itutart 

littk 

I ippfial 

■ a 

of tn> k* 1 

iug Af ■• 






a:; 1 -' 



robr- 



Id* 



{» 



ELECTRICAL INSTRUMENTS, ALL KINDS 

BATTERIES, Primary and Storage, sop general heading Batteries 

BELLS, Electric, see general heading Bells. 

CENTRIFUGES, sec general heading Centrifuges, 

CONDENSERS. Paper and Mica, see Catalog F of Physical Apparatus 

DEMONSTRATION ELECTRICAL APPARATUS, see Catalog F of Physical Annaratiw 

ELECTROLYSIS OF WATER APPARATUS, see Lecture Apparatus ™ ySlCal A PP aratus - 

ELECTROLYTIC APPARATUS, see No. 5140. 

F3609. ELECTROMAGNET, 5 ohm resistance, for instrument making si nn 

ELECTROSCOPES, see Radioactivity Apparatus. 

ELECTROSTATIC APPARATUS, see Catalog F of Physical Apparatus. 
FURNACES, see general heading Furnaces. 

W453. GALVANOMETER, D'Arsonval, Wall Form. This Galvanometer is a superior instrument, com- 
pact in design, and well finished in every detail. 

The Magnet is laminated, giving a strong, uniform and permanent field, which is concentrated by 
a soft ii. Mi core. The instrument is mounted on a finely finished hardwood board. 

Cod System. As noticed from the illustration, one of the principal features of this Galvanometer 
is its REMOVABLE coil SYSTEM. The coil is suspended in a frame and forma with it a 
TJMT winch slides into place l.y means of guides int.. a good electrical contact. It is there- 
fore posible, by securing any number of coil systems, to have a universal instrument with only 
the additional cost of the extra system... Also, if any adjustments or repairs arc to be made 
on tin- suspension system, the frame ran he removed and laid ll;it on the table 

Each galvanometer is supplied with a 250 «h m DEAD BEAT Coil, with a plane mirror of K-inen 
diameter. Extra toils are listed below. 

The Suspension. The upper suspension is a phosphor-bronze ribbon toee No. F4r>ii) The lowi r 

suspension is a copper helix. 
The Reading Device consists of a telescope with achromatic objective and a hirhrnme scale 

nmuMted upon an adjustable arm, which may be entirely removed when not in use 
The Housing is of cast aluminum, combining strength with lightness, and is detachable by 

loosening two thumb screws, giving easy access to the interior. A large window is provided 

for viewing the moving system. 

Mounting and Leveling. The galvanometer is suspended on the wall by means of two suspension 
loops on the hardwood board which supports the magnet and housing. These loops are pro- 
Vided with leveling screws and, with a third leveling screw in the center of the base board, 

provide a convenient means of leveling the instrument. 
Sensibility. From the mean of a number of readings the sensibilitv in megohms was found to 

be as follows: 

With dead beat coil of resistance, ohms 5 250 fiOO 

At working distance 3.r> 33 4fi 

At one meter distance 7.3 68 1 00 

thermo- Whentstone hydrogen 

Suitable for use with couple bridge electrode 

Complete with 250 ohm Dead Heat coil, reading telescope and scale, and jeweler's screwdriver. 
• 50.00 

191 



■■:■ ; •• ■ 






ELECTRICAL APP. CENTRAL *'\ KXTI PIC CO., CHICAGO, V. S. A 








No. F4462 




No. Fll r j8. 



No. F4464. 



P4454. GALVANOMETER, D'Arsonval. Table Porm. Bami as No. F4453, bul mounted on a heavy tripod 
i "i tabic use , $55.00 

C 

500 

15.00 

C 

1000 

15.00 



F4456. COIL SYSTEMS. Dead Beat, for Nos. I 153 4. No \ B 

Besistam e, ohms S 250 

Each 15.00 15.00 

P4457. COIL SYSTEMS, Ballistic, for Nos. 4453-4. No A B 

Resistance, ohms ISO "0 

Each 15.00 15.00 

F44:.s. galvanometer, L. & N., Type R, n high sensitivity, high resistance instrument of rapid 
period, particularly designed for resistance measurements by the Wheatstone bridge method 
and foi thermo-couple wort It is also well suited tot precision measurements with the hydro 
gen electrod The instrument is mounted on a bakelite base with large levelling -nv« . 
lv protected by a cylindrical housing finished in dull black japan. A targi window in the 
housing permits observation of the working parts, A concave mirror L3 nun in diameter with 

;| radius of eun iture of meter is attached to the coil for use with a lamp and seale suel 

;is «'ur N«». i-'4 •".}•; described on page l '.».'*. 

No 

Coil resistance, ohms 

Sensith ity, mi gohms 

Period, s< conds 

Eacn 60.00 60.00 

F4-}f.i', GALVANOMETER, Portable. Student's, with Inclined Scale. This is a pivot and jewel type of 
moving coil galvanometer with pointer and scale giving a deflection of one scale division on « 
current produced by one volt thru i;l\.-.uu ohms. The scale is uniform and deflections aw 
closely proportional to current. This galvanometer has the exclusive feature :mmng instru- 
ments of this general description of having mounted upon its top three push button keys, th.? 
use oJ which will protect it fnnn damage which might otherwise result from exi ssive currents, 
ot the three push buttons, the first eonnects a high resistance with th galvanometer, the second 

a resistance one-tenth as great as the first, and the third connects the galvi meter directly 

2?.wt' J" tins H.aM.ier it is possible to secure a quick indication as to the direction in 
which the Wheatstone bridge is unbalanced, and it enables the atudenl to secure an approxi- 
mate balance before connecting the unprotected galvanometer into the circuit. With diree- 

Tunis I f ■ I" US!' iQCA 

P4464. 



a 

in 
l'ii. i 



B 

;,ini 
WW 





Fur other Galvanometers, sec page 204. 



102 






CENTRAL S CIENTIFIC 00, CHICAGO, U. S. A. 



ELECTRICAL APP. 



B 



8 

■ 



.... 

1 ID 'lllMT 

. 

A 

i 

» 
LOO 

[fftflfff* 

I 

*** 

- 




No. F4546. 



No. F4482. 



GALVANOMETER ACCESSORIES 




,.' 



.• 



lamcter. 

To operate the lamp a 6 volt storage battery is most satisfactory. However, we can sinroiv an 
adapter tor operating the lamp on a 110 volt circuit, either A. C. or D C $28 50 

P4547. Lamp and Housing, only of No. F4546, with 6- volt, 21 e. p. lamp \\ n 00 

F4548. Adapter for operating 6-volt lamp on 110 volt circuit ! 60 

F4.-49. Lens converging, unmounted, 1 meter focal length. Can be attached *t'o galvanometer window 
witti a bit or soft wax «,. 

F4475. UNIVERSAL SHUNT, suitable for use with any galvanometer,' and YhcVefore' far 'more usefu. 
than the ordinary type of shunt. The total resistance is 5000 ohms, which is sufficiently- high 
t«»r use with any of the galvanometers listed in our catalogs. It is arranged for shunt powers 
<>r iio, loo and 1000, the different adjustments being made- bv use of a single plug When 
Hie plug is at the zero position the main circuit is complete, hut no current can How'throuL'h 
the galvanometer. Mounted in a brass case with wood base and hard rubber top 25 00 

F4482.D-ARSONVAL REPAIR KIT. Consists of a neat wooden box containing two pairs of forceps 
tor handling suspensions, a watchmaker's screw driver, suitable for small screws on anv gal 
vanometer, 6 upper phosphor-bronze suspensions (see No. F4511) and 3 lower copper BUS pen - 
Sions (No. F4483), all conveniently accessible. For use with No. F4453 Galvanometer.. 4.00 

F4483. LOwjsjs SUSPENSION only, copper, spiral form, as used on No. F4453 Galvanometer " 20 

F4492. GALVANOMETER MIRROR, plane, % inch diameter 45 

F4493. GALVANOMETER MIRROR, concave, 1 meter focus, V 2 inch dia meter 1.35 

M511. GALVANOMETER SUSPENSION RIBBON. Phosphor Bronze, 0.001x0.013 inches.. Per foot .15 
F451 2. GALVANOMETER SUSPENSION RIBBON, Phosphor Bronze, 0.0007x0.005 inches.Per foot .15 

193 



ELECTRICAL APP. CENTRAL BCT KXT1FIC "P.. CHIPA. ■■ I IT. S. A. 





No. 4701. 



No. 4708. 





No. F3G65. 



No. F3G81. 



17U4 






1708 



F3665, 



Piiiisl 



GENERATOR. Electric Charging and Plating Dynamo, for charging storage batteries ami elec- 
troplating. Tins la a shunt-wound dynamo with bi -polar field of the ring type, easl solid 
with thi Frame. The coils :ire form wound, carefully taped and shellacked; thej a entirely 
safe from mechanical injury or breakdown. The armature is of the drum type, laminated,! 

wound — it does no1 beat. The commutator is of hard copper, fully insulated with mica. 

The brush holders are of nevi design, of the radial type, mounted on :in adjustable poke. Tin 1 
brushes are of woven wire, Belf-adjusting — thej do not spark. The bearii . in oi bard bronze, 
nicely fitted; workmanship throughout the best. Finished in black enamel. Fitted with 2 %■ 
inch tint pulley. Beight overall, 6% inches; length of shaft, 9 inches; w Gen- 
erates 7 volts, "ll amperes, at 2 r. p. m S33.00 

GENERATOR, Experimental Dynamo. A shunt-wound dynamo particularly desirable for rxperi- 
mental purposes It will light to full power twelve 6 volt 3 c. p. lamps. The construction is 
essentially the same as that of No. 4704, and it possesses the same excellent features, bul is de 
Bigned for a smaller energy output. Length of Bhaft, 6 inches Weight, 9 pounds. Occupies 
space 6x4% z6 inches. At speed of 2200 r. p. m., the outpul is 36 Watts (6 volts, 6 amperes 
12.00 

HEATERS, see general heading Heaters. 

HOT PLATES. Bee general heading Hot Plates. 

INCUBATORS, see general lieadiny Incubators. 

INDUCTION COIL, equipped with a patented mechanical circuit breaker, which i< mounted in 
dependency on a heavy piece of enameled slate. This makes the construction very rigid and 
increases the efficiency of the coil. The secondaries are built in sections and each section is 
wound in layers. Three special means of adjustment are provided all.. win- ., wide range of 
regulation, so that the coil is adapted for a large variety of work, i .mplete with s double 
pole, double throw knife switch. The 150 mm coil will produce a heavy 150 mm spark with 
an input oi 4 volts, 6 amperes u'4 watts); the other coil takes a proportional input. 

Xo h 

Spark I. -Myth, mm y„, 

Each ;;;;;;;;;:;;;;; ::;;;;;: :::::::::::: 50.00 8&.oo 

^SPSS^J?^ "HI, n.l.iu.iui.le vibrator oi interrupter, commutator and condenser, wound 

^y^^m^y 11 ^ 5 " r,,iU:,nly S,,, ' l We W0UBd With •'•"«' — -' M0UntCd "" 
No p 

spark length, mm...".;..';;;;;;;; A ,. ?„ f fl « 

8.00 12.00 15.00 20.00 

194 






■WtW 






H 



cektoai, acmwrmc on. Chicago, u. s. a. 



ELECTRICAL APP. 



t_ 



. 




Nos. 4504-4513. 

CENCO D'ARSONVAL TYPE D. C METERS 

After nearly a year of development work in bri MtltRS 

BWe performance under severe conditions and 
possible selling price for a good instrument 
rect current moving coil ammeters and volt'.., 

a^srywKSA^iyr" from every *** ° f *~ *» * ■=« sns 

*tho^!£« 58ft" ** * Wi,, ^ ain US ■**" P~tly 

insures aniformity of air gap in all instruments g d to UmfOTn " insi,,e wi,lt1 '. which 

The Pole Pieces and Core are carefull 





full seal,, deflection. mJnenCy 0t tallb ™tion. The sensitivity is approximately L>U millivolts for a 

ease is handsomely finished with h,?l u„ ,„I ,- I T^VniJn .r " , "' 1 1,,s " 1;,ti "S. "'"t.-rial, and the 

«0A ALTERS Ce D ^ meter ' V °' tmetei "* ™>*»»««. »« W "*• 

No 

Range, amperes, zero to ''...... ' ? n 9- 

Smallest division, amperes ................*'.'."" oj *5 

m. AU>^' O^wiiidoubie scale: • -Rang.,- 0-io ^e.' in f ^ ' itft m an ,^°? 

Range-, volts, zero to ...'...' .' '.." '. '. ' '. . . " .15 15 i fn o^n 

Smallest division, volts „,„ 1 ^ 2 g° 

4511. VOLTMETER, banco; ,it, double scaie. 15 *°° 16 '°° 17 '™ 22 ' 50 

No 

Hang,-, volts-, zero to ....'...'.".'.'. " t*.? e ,„,. 

Number of scale lines ' ' *iff 150 :J5 

Each ' ' 1)0 

unit , WMETER ' Cenco ' combined instrument with ranges (MO volts and 0-10 amperes in 0.1 
isions 1? g Q 

195 



ELECTRICAL APP 



CBNTBAL BCIENTIPIC 00., CHICAGO, U. S. A 






I 



No 492 . No. 4494. No. 4496. 

METERS, POCKET D. C. 

These meters are extensively used for rapidly measuring the voltage and am pi of batterii 

They are exc lingly dead beat. Thej can also be used as polarity indicators I ny direct current 

B ince thej "ill no1 give a reading unless the terminal at the bottom is in i icl with the poi 
terminal of the circuit undei test Each instrument is packed in a cloth bag in a paper carton. 

4492. AMMETER. Rangi 0-40 amperes $1.00 

1494. VOLTMETER- age 0-10 volts 1.10 

4496 VOLT AMMETER. Range 0-10 volts and 0-4 nxperea 1.30 





Model 155. No. 4524E. Model 156. 

METERS, IMPERIAL— ALTERNATING CURRENT. 

METERS, Switchboard. Standard electrons nstruction, hand calibrated scales, which, 

;i- mi .-ill A. ( Meters, cannol !>•' used with great a< 1 icy over th< Brsl § 25 pei tent of 

their range quality jewel and pivol bearings; brass case, fin 1 in bal ■name-land 
dusl proof. Diameter, 1 inches. 

4524. AMMETERS. 

No H C D E F 

Range, amperes 3 5 10 15 30 

Smallest division, amperes o.l OS 0.25 Oi 

Eacn S14.85 14.85 14.85 16.20 16.65 

4526. VOLTMETERS. 

No C E 1 

Range volts ::,, r 250 

Smallest division, volts ,..-, 5 

Eacn '...........'.'.'.'.'.'.'.'.'..'.'. 15.30 18^00 19.80 

tutt-t^c « ^ METERS, WESTON— ALTERNATING CURRENT. 

mjj 1 LKb, Portable, Model L55. '!,,>,■ instruments are perfectly dead beat, extremely sensi- 




4532. 



4.148. 



_. pivniN. 1,-wci. .1 Hearings 

ATvr^Tr^n ;; W ' Cases ' Dimensions 7x7%x3% inches. 

5J5S^' 2'i? • m P«M 31.25 1540. VOLTMETER, 0-125 volts 33.75 

Aiviivitjiijtc, 25 amperes 31,25 

instruments are of a high sta 

>r a minute or permanent ly, mi\ 

id beat, and are provided with i 

h of i ase, 3.15 inches. 

4550. AMMETER, <>-50 amii 
AMMETER, 0-25 amperea 22.25 4556. VOLTMETER, 0-130 ^.lt*. 2i°0 

196 










I 













Model 310. 




CENTRAL SCIENTIFIC CO PHTPirn tt o 

^^UJ.^CHICAGO, U. S. A. ELECTRICAL APP. 

METERS, WESTON- (continued). 

WATTMETERS, Portable, Single-phase Model 310 

4584. WATTMETERS Single-phase, double TO Itage and current 
ranges. Rated voltages of 200 and 10 volt , w n 

Normal amperes, series g 5 5 V (1 

Normal amperes, multiple...! "5 10 ■■<> 

Maximum amperes, series... 5 10 an 

Maximum amperes, multiple. in L >0 411 

Kalowatts. field <ni Is in series O.o/O.i'o l/as o, , 
Kilowatts, field coils 111 

multiple 1/0.5 2/1 4/2 

No. of scale lines 100 100 |n.i 

Each 5123.75 123.75 123.75 



lei 136. 



Model 45. 




Model 1. 



led saM 
bibdw 



E 
15 
S 
lfiJ "1 






M 



wtnsH 

I 
am 



;" 



affcal ] 



•i 



• ■" 



::•••■"' 



1600. 
4602. 
4604. 
4606. 
4608. 
4610. 
4612. 
4614. 
4U16. 



4626. 
4630. 
4636. 



4638. 
4640. 




N 

No. 4608 Meter has an external shunt" 

MTLTJAIWyrB TEB, range 0-100 ma. i„ 1.0 ma. divisions 41 „,, 

7 JS5J55' range " -"' am P e «* '» <».05 ampere divisions . 1, S 

UHSS5- ra,,u " " 1: ' i ""' ,,ri ' s in "• ' :i "'i'-- divisions ::..::: s-g 

^SES r «»ffe 0-25 amperes !„ 0.i> ampere divisions .. £"g 

{Sttt^SSSj ,;,,,t - r " ° r *° an, I ,er " s in '»•* am Pere divisions ^°° 

vn^ X J^? ETER - r:, "«" () -"° mv ' in ° -' '- • divisions ] *f™ 

VOLTMETER, range 0-5 volts in 0.05 volt divisions ' lit 

VOLTMETER, range 0-15 volts i„ .,., volt diviSon. " f™ 

VOLTMETER, range 0-150 volts in 1.0 volt divisions V. S'f£ 

JMOTE.— I)u„id.. Scale Voltmeters of the above type will be furnished at a price of M.25 in ad'di- 

""" '" tne price of the highest range. 
METERS, Portable, Standard, Model 1. These meters are adjusted and calibrated with 
greatest (; , re. and when used properly give exceedingly accurate results. They are direct 
waaing, portable, permanent, and "dead beat," ana are, in fact, the recognized standard in- 
AMm""" 1 laboratory and general testing. 

amSt?t?S" range '" ; ""l"' res , »" "- 1 ampere divisions, readable to 0.01 ampere 81.25 

SmTTirrl 1;, "" r "'" am P ei *e*> in 0.5 ampere divisions, readable to 0.05 ampere 8L25 

M1LLIVOLTMETER, zero center, double range, 10-0-10 and lon-o-100 mv, supplied with key by 

wincii either range may be employed 68 75 

Any of the above MILLI VOLTMETERS may be supplied equipped for Shunts for ampere read- 
ings at an additional cost. 

VOLTMETER, ran ye MO volts in 1 volt divisions, readable to 0.3 volt 68.75 

VOLTMETER, double range, 150 volts readable to ".1 volt an. I 15 volts readable to 0.01 volte. 

93.75 

197 



■-. ■' 




ELECTRICAL APP. CI 



JEKTBAL SCIENTIFIC CO, CHICAGO, V. s. A. 



2 



« 

s 




Model 24. 













No. 4674 (Vertical). 



No. 4674. 



No. 4674 (Horizontal) 



METERS, Switchboard, Model 24. The- small round pattern meters arc expressly designed 
t<i meet the demand for good but low price Instruments for use on switchboards. The total 
diameter ol the front is 6% inches and the total depth i inches They are carefully designed 
to secure the highest degree of durability and reliability; they are absolutely dead beat, and 
their indications can be relied opon within 1%, The cum- are finished in black japan and are 
neat in appearance. 

4652. AMMETER, 0-10 ampert - in .'-' ampere ili visions $24.75 

4654. AMMETER, 0-25 arap< res in ,5 ampere <l i \ isiona 25.50 

4656. AMMETER, 0-50 amperes in 1 ampere divisions 25.75 

1658. VOLTMETER, 10 volts in .2 volt divisions 26.50 

4060. VOLTMETER, 0-25 volta in ,5 v.. it divisions 26.50 

4662. VOLTMETER, 0-50 volts in 1 volt divisions 26.50 

1664. VOLTMETEE, 0-130 volts in 2 volt divisions 27.25 



4674. 



1 



METERS, WESTON (continued). 

METER. LECTURE TABLE. D. C. 

GALVANO-VOLT-AMMETER. Combines sis different electrical m.-asuring instruments: 
i 1 1 ( ralvanometer. 

(2) Milli-Voltmeter, range 25 25 mv. in 1 mv. divisions. 

(3) Mil- Ammeter, range 25-0-25 ma. in I ma. divisions, 

(4) Voltmeter, range 5-0-5 volts in 0.2 volt divisions. 

(5) Voltmeter, range 125-0-125 volts in 5 volt divisions. 

(6) Ammeter, ran^.- u.vu iTi amperes in 1 ampere divisions. 

'I'll' 1 '■'•••" is i" Hi- .-ntor of the scale so that no time need l.e wasted in determining the posi- 
tive terminal ot a circuit. It is s«. mounted that it may be used in eithei oi THBEE POM 
riONS— vertical, horizontal, or inclined at a eonwmmt angle. (These positions are shown in 
tne illustrations above.) The working parts are fulK exposed to view and all connections may 
readily he traced. It is an extremely sensitive instrument, and bavin* no suspensions, mirrors 

E&EIA?5?52KL N .2 ()F VOLTAGE, AMPERAGE AND RESISTANCE OF BATTERIES; the 




i:»s 






m 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8, A. ELECTRICAL APP. 






NO. 4716, 




No. 4720. 






4710. 



4717. 



4720. 



47l'4. 



4 7l'«i. 



4730. 
4731. 



No- 4724. No . 47i6 , Nos 473Q 31> 

MOTORS 

MOTOR, Porter Battery No. 1. A. standard article, perfect in ,vnrv detail of design and con- 
struction, an. I accurately made. Nicely finish..! in black enamel, l 100 h n 1 .>-3 volts " 
amperes, .j.jOO r. p. m.; size, 3 »/ix:iVix3»4 inches; weight, 1'.. lbs .".'.." 34,25 

MOTOR, Porter Battery No. 2 Bimeu No 4710. but 1/90 h. p., 3-6 write, 8 amperes, 4000 
r, p. m.; size, 3%x4x4*4 inches; weight, L' ;! , lbs \ ' 7 2 5 

MOTOR, Universal. This motor may be used on 110 volt either Alternating (Co .vein) or Direct 
Current. Will develop approximately 1/50 h. p., is efficient and will not heat up when oper 
atmg on either circuit. It is constructed in a substantial manner, having laminated fields 
and armature and a twelve-section copper commutator. It uses a &-inch carbon brush an. I is 
equipped with compression grease cups and bronze bearings which insure- perfect, lubrication. 
It weighs 4V» pounds, is 6% inches high and consumes about the same amount of current as ,,.,,• 
8 candle power lamp 12.00 

BATTERY RHEOSTAT, for regulating the speed of small ru..t..rs, and also for use with minia- 
ture battery lamps. This rheostat is nicely finished with nickel trimmings and rubber ban- 
die. Resistance, to 3 ohms ! 80 

MOTORS, Alternating Current, series wound, for light work and intermittent service in the lab- 
oratory. Especially valuable for operating shaker*, stirrers, rotating electrodes, etc. For IK) 
volt 00 cycle circuits. 

£°V ; C E O 

**• v 1/lOu 1/50 1/25 

Speed at full load, r. p. m 2200 1800 Isnn 

Diameter of V-gn»ove pulleys, inches % 114 [1/ 

Shipping weight, lbs *. In 15 24 

Eacn 12.00 15.00 18.50 

MOTORS, Alternating Current, split-phase induction type, for constant speed and continuous 
service requiring the expenditure of more energy than can be obtained from \... 4746. For 
use on 00 cycle circuits. Pulley is grooved for Vi to ,, ; in. Ii round belt. 

No \ C E G 

f- p - % * -<> 1/12 % & 

Speed, r. p. m 1725 1725 17 1725 

Diameter of pulley, inches 1^4 1% 1% 2% 

Shipping weight, lbe 20 L'4 _'<; 86 

Each, for 110 volts 17.00 19.00 20.00 25.00 

Each, for 220 volts 18.00 20.00 21.30 26.00 

199 



-■-> 







ELECTRICAL APP. 



< HNTISA1 srllNTII TO ")., OBIOAOO , n. 8. | 














4748. 












1776. 

i , i i . 








No. 4Ti8. 



Nos. 4776-7, 



No. 1811. 





No. 4810. 



No. 4816. 



I) 


i 


H 


1 LOO 


1 ".(I 


1, 


2200 


18 


lMlil 


% 


1', 


Vk 


ID 


15 


24 


512.00 


15.00 


18.50 



MOTORS. Direct Current, series wound, similar to 1746, but wound for II" trolta direct tar 

rent Suitable foi lighi work and intermittenl sen 

Mo 

II. P 

Speed, r. p. in 

Diameter «t V-groove pulley, inchee. 

Shipping weight, lbs 

Each 512.00 

MOTORS. Direct Current, shunt wound. Pot purposi s n quiring constant speed over long periodsol 
time. Useful for operating blowers, vacuum pumps, staking machines, small grinding mills, 
etc. Pulley is grooved for % to & inch round belt Si e D is compound wound; the othen 
shunt . 

X.) \ 

II. p l 20 

Speed, r. p. in 1725 

Diameter of pulley, inches 1 ' » 

Shipping weight, 1 1 is I "> 

Each, for 110 volts 19.00 

Each, for 220 volts 20.00 



B 

1/12 

1725 

1% 

22 

21.00 
22.00 





D 


K 


U 


1725 


1725 


2 


"i . 


2 


28 


23.00 


28.00 


24.00 


29.00 


lllc\ B 1 


. 8 , 3 and 



-isio. COUNTERSHAFT, U inch in diameter and L2 inches long, with bearings and pulleys l, 

4 inches in diameft The pulleys are bored and grooves turned true with the shaft, to which 
they are Fastened with set screws, so that their position on the shaft may be changed Deed iu 
connecting small engines and motors with other machinery 2.50 

4814, speed reducing gear. An improved device by which the high speed of an engine or motoi 
is converted into a slow, powerful motion. The round plate may be removed, if desired, and 
direct connection made to shaft. Geared *^ to 1. Pulleys grooved for A inch round belt. Tm 
fast running pu ley has diameters J. 3 and 4 inches, and the Blow running pulley diameten 

2 ami 4 inches, thus -iv -iny a wide ran-'- ol Speeds 7 '°° 

4816. SPEED REDUCING GEAR, similar to Xo. 4814, bul with thd gear enclosed in a case which is 
filled with grease so that the gear will run silently and without attention for a long tima 
Gear.'. i \s to 1. Pulleys grooved Cot ,, inch round belt The fast running pu ley is * lI "' ! 
in diameter an. I the slow running pulley has diameters I, L%, - and 2% inches, thus givinga 
wide range of speed * t " lO.oO 

For other MOTORS in addition tu those listed, see Nos. 2361, 2362 ami 12860. 

200 






!• - I 




No. I8ii 



CENTRAL SCIENTI FIC CO., CHICAGO, U. S. A. 



ELECTRICAL APP. 




No. 4826-4835. 



I • .' 



F 

- 



I 



ft 



MOTOR GENERATORS 

A. C. to D. C. 
FURNISH DIRECT CURRENT WHEREVER THERE ARE ALTERNATING CURRENT MAINS. 



For the conveniens of institutions which have available only alternating current and which need 
rwot direct current tor such purposes as electrolytic analysis, operating Induction roils for M-tn 
lyfllS, charging storage batteries, etc., we offer the motor generator sets listed on this and the l 



source 
analys 
lowing page. 



a 

trum 
this and the t'ul- 




jmparauve nniount or energy 
delivered by one of these outfits from a consideration of the fact thai a hand-feed arc lamp, such as is 




connected in parallel to the generator for use si mul ta DOOUSl v, the total current drawn from the "cu- 
eratoriS the sum of the currents in the several units. 



A generator should always be selected for the maximum service which it may be called upon to ren- 
der, since the difference in initial cost is comparatively small as compared with the cost of replacing a 

burned out coil. 

The outfit shown on the following page, with switchboard equipped with ammeter and automatic cut- 
out, are strongly recommended, especially for charging storage batteries! since it is impossible to dam 

age either the generator or the battery by connecting the battery to the generator before the latter is 

started. 



Specifications. 



Generator shunt wound. 

Generator and motor direct connected and 

mounted on same base with flexible coupling. 
Motor is well ventilated. 
Radial brushes set on neutral. Reaction type 

brushholders used. 
Xo sub base required. Sets may be bolted 

direct to support. 
No starting box needed. 



Useful for battery charging. 

Generouff size bearings equipped with wick 

oilers. 

Heavy four arm bearing flanges with ample 
ventilating ducts. 

The voltage chosen may be varied 85% above 
and below normal rating by means of the 
field rheostat furnished with each set. 



4826. 
4327. 



MOTOR GENERATOR, A. C. to D. C. With single phase, 60-eyele motor, and generator wound 
for any voltage from 6 to 250 volts D. C. (State voltage desired when ordering.) 

Xo \ B e 

Output, watts 40 90 150 

Floor space occupied, inches 8x17 8x19 8x19 

Speed, r. p. m 1"25 1725 1725 

Shipping weight, lbs 80 90 105 

MOTOR GENERATORS, with 110 volt motor $70.00 78.00 88.00 

MOTOR GENERATORS, with 220 volt motor 72.00 80.00 90.00 

201 



ELECTRICAL APP. 



CENTRAL BCmmFlc «■<>. < ■HICAQO. U. 8. A. 




Nos. 4842-4848. 



















MOTOR GENERATORS, D. C. to D. C. 

Sets with the same features as those des< ribed on preceding page -ire listed for service on 110 or 220 
volts direct eurrenl for producing any desired direct eurrenl voltage. 

MOTOR GENERATORS. D. C. to D. C. With direct I -urr. lit motor, -hunt wound, fin.l generator 
wound for any voltage from 8 to 250 volts D. C. (State voltage desired when ordering.) 

No ■■ N B 

Output, watt- "' ' ,n 15fl 

Shipping weight, lbs 80 90 105 

4834. MOTOR GENERATORS, with 11" volt nOtOI $64.00 72.00 82.00 

4835. MOTOR GENERATORS, with 220 volt motoi 66.00 75.00 85.00 

MOTOR GENERATORS with Switchboard. Those motor generators will moot the demand for a 
self contained outfil for the laboratory, wh ich may I"' iiBed to furnish ili«' regular laboratory 
eurrenl and is especially valuable foi battery charging The outfits consist of a Motor Genera- 
tor Set similar to the type described on page 201, with the generator for 24 volts D. C, and a 
stool switchboard panel, mounted as in the illustration and having the following 

Specifications. 

Automatic cutout switch <>n sets with A. C Separate snap switches on sets with D. C. 
motors to prevent discharge ■•! lotteries mi'ims f..r m«>t..r and generator circuits, 

through generator. „ r _ ,„,„,„. Btarting Bwitch ,.„„„,.,.,< motor 

Snap switch on sets with A. <'. motors whii b to line through a Btarting resistance which is 

simultaneously opens and closes motor and cut out by turning --witch t m position as 

goncratm circuits. motor gains speed. 

Ammeter for reading charging current. Rheostat for adjusting charging current. 

Field rlicustat for adjust ing voltage. 

The field rheostat will reduce the voltage of anj set to per cent of its normal rating, hut the 
charging rate used must ool exceed the ampere rating marked on the generator name-plate. 

These outfits are shipped completely assembled with all wiring done except connecting the motor 
to the hue and the generator to its* circuit. All terminals are clearly marked to facilitate 
making those connections. The outfits will be found very simple to "install and easv to op- 
erate The motor of No. 4842 is supplied with two pairs of leads, one for use on 110. the other 
on 220 volts. 

No ■« pj, 

output, watts v.7.7.7.'.; ;;;;; ;;;;;;;;;; ; 250 500 

\ oltage of gene nit or .-,, ... 

Shipping weight, lbs ■'••■■■■■■■■.....,....'.'...'.'.'.'.'.'. 170 250 

4842. MOTOR GENERATORS, with single phase, 60-c.vcle motor. For use on 

either 111. or 220 « nits UQ QQ mQQ 

4846. MOTOR GENERATORS, with 110 volt. D. C, shunt wound motor 130.00 155.00 

4sts. MOTOR GENERATORS, with 220 volt, D. C, shunt wound motor 130.00 155.00 

OVENS, see general heading Ovens. 

PHYSICAL CHEMISTRY APPARATUS . , 

xxx.nioxtt.jt Ar-x-AKATUS, see general beading Physical Chemistry Apparatus. 

202 



"'.•*; - -*- 



m 



^m 



t'KXTKAL SCIENTIFIC CO., CHICAGO, U. S. A. 



ELECTRICAL APP. 



■ 



ft*, 



- J 



B 
ft 

90 

":oo J 

"00 [|| 

•Imiiiri 

.ui 

tawing 



ti til 



nil ratit; 
•rator wtp I 

■ 



B 



40.00 
30.00 



■ 

i 






4856. 




«!«** 



No. 4856 (Shown without Cover). 
POTENTIOMETERS 

POTENTIOMETER, L & N, Type K. For .Measurements of potential differences in which the 
utmost obtainable accuracy and precision are desired, this potentiometer is the best thai can be 
bought. Because of the numerous occasions for aerate measurement of potential differences 
in many different kinds of investigation, the value of the instrument to the user is much in- 
creased, since it has an exceptionally wide range which makes it suited to measurement of 
both low potential differences such as those of thermocouples, and, without :,. -ess,,, -ies, ,,f all 
potential differences up to 16 volts. In the laboratory of physical chemistry it is especially 
satisfactory for the measurement of electrode potentials and temperatures. The accuracy with 
wbieh electromotive force can be measured ranges from .02% to .1',. the latter figure apply- 
ing t... measurements of very small potential differences. 

The measuring circuit of the instrument consists of 15 coils of 5 ohms each, adjusted to 
.01% accuracy, connected in series with a slide wire. The potential difference to be measui 
is applied through a suitable galvanometer (see No. F4460) to a contact brash bearing on a 
series of studs, through wbieh connection is made between the coils above mentioned and a 
contact which can be moved to any point on the extended slide wire. When the current 
through the measuring circuit has been properly adjusted and the sliding contacts so placed 
that the galvanometer shows no deflection, the potential difference being measured has the 
value indicated by the settings of the movable contacts. To facilitate adjustment, three tap- 
ping keys are provided by means of which resistance may be introduced into the galvano- 
meter circuit without disturbing the settings of the contacts. An auxiliary dial should be set 
to the certified value of the standard cell voltage. An ingenious arrangement of circuits per- 
mits changing the range of the instrument to one-tenth its normal range merely by shifting a 
plug. As a working battery, a single lead storage cell (see No. 1042) or two No. 6 dry cells 
in series (see No. 964) or two Edison cells in series (see No. 1048) may be used. 

The case of the Type K Potentiometer and its dust-proof cover are of polished mahogany. The 
top of the instrument on which the various parts are assembled is a thick plate of highly pol- 
ished ebonite. The extended slide wire is wound on a molded cylinder and the contact which 
bears on the slide wire is mounted inside a cylindrical housing (it* bakelite which serves at the 
same time as a shield against the accumulation of dirt on the slide wire. 

When the Type K Potentiometer is used with a sensitive galvanometer for the measurements of 
hydrogen electrode potentials, the attainable precision is so great that, unless the most extreme 
precautions are observed in control of temperature, pressure, and purity and strength of sola 
tions, the information given by the readings will be very little better than that obtained with 
less refined apparatus. 

The investigator who takes pride in the excellence of the instruments comprising his equipment 
will feel that his laboratory is not complete without a Type K Potentiometer. 

Complete as described, with regulating rheostat incorporated in the same case, with complete 
directions for use $275.00 

203 



■'■':■■.' 



5£ 



ELECTRICAL APP 



, ■ 



CENTRAL s< 



tBNTlPIC - ■".. CHICAGO, D. ft \ 









No. 4860. 



No. F4460. 



4S60. POTENTIOMETER, L & N, Students'. This is an instrument especial!} designed fur use in the 
students' laboratory, but is useful also for everyday potential measurements, [n order to 
avoid making the instrument expensive bu I at the same time to embody in it the highest 
quality attainable, the manufacturers have omitted such refinements as contributed only to 
convenience bu1 which had no bearing on accura<-\ ..f measurement. As a result this instru- 
ment i- much simplified in construction as compared with the Type K Potentiometer (see No. 
1856). In :m instrument intended for students' use, this simplification baa the advantage that 
it makes necessary on the pari of the student a celar understanding of the circuits whirh 
adds much to its educational value. With the students' potentiometer measurements may 
be made of potential differences up to 2.3 volts. There are 22 steps of .1 volt each and a 
slid* wire having ■*» total range of .1 volt on which a continuous variation of potential may be 
made. The calibration of the slide wire is guaranteed to be within one-half per sent, of its 
range, i. c, to JMMi;. volt. This figure represents the numerical probable accuracy of any read- 
ing. The 22 coils ar< sdj i to equality within one-twenty-fifth per cent. Binding posts 
are provided which permit a connection to the slide wire only through s pair of cn<l coils 
each of which has 4..". times the resistance of sii.b- wii These extension coils may be short 
circuited by means of a switch provided on the instrument as shown in the illustration. In 

this manner it becomes possible to US6 the Slide wire as the Variable ratio in a Kolib ausih 

bridge for the measurement of electrolytic resistance. This feature makes it a double purpose 
Instrument and therefore especially valuable in a stmlents' laboratory pf physical chemistry. 
Each instrument is accompanied by a direction card secured in the cover, showing connections 
both for measurement of potentials and for resistance measurements. 

A polished mahogany case and cover are provided. The electrical parts are all mounted on a 
highly polished ebonite plate and the workmanship and finish are of the best throughout $90.00 

Note:— When No. 4860 is used in a Kohlrausch bridge, No. 4743A is the proper resistance box 

to Use in connection with the slide wire. 



F44fiU 



GALVANOMETER, L & N, Combined with Lamp and Scale, especially suitable for use with 
tin- Type K Potentiometer for measurements with the hydrogen electrode. This is a single 
unit instrument which combines a moving coil galvanometer and a mirror attache! to its coil 
with the necessary lamp and scale to indicate the detection of the coil. I -f its con- 

struction by which a beam of light is employe,! in place of the usual pointer in B portable 
instrument, much greater sensitivity is secured in a resilient mounting. The result is that 

great stability is obtained without the sacrifice of sensitivity The combination instrument 

may therefore be set up without the painstaking leveling required in instruments of the usual 

f»rm in which the coil hangs from an upper support but is not held in position by means of a 

taut lower snspt-nsmn. This U r :i i vano.ncter has s resistance of 1000 ohms which makes it 
especially suitable for gas chain measurements, it has a period of 3 seconds for a complete 
vibration, and its- sensitivity is 2 mm (on its own scale) per microampere ^.00 



-Jul 



J 

■ 



N for ska i 
io it thetyj 
woJt tb i« 

Went ri 
v h caek aril 

' itolBjIrj 

r per cent rfa 
rat? of urntl 

air of aiflfl 
1I5 osrbrtf' 
illtrtnui 3 1 
is a Kiiha* 

ring court*. 



":-VfBAL SCIENT IFIC CO., CHICAGO, U. ft A. 



ELECTRICAL APP. 



No. 1866. 



No. 4870A-B. 



4866. 



4887. 

48«is. 
4870. 



No. !870C. 
RADIOACTIVITY APPARATUS. Bee general heading Radioactivity Apparatus. 

RECTIFIERS 





readily 
™aHerna1&g~"ci^ J« u»e«l on either 110 or 220-volt 

CHEMICALS for Xo. 4866, per complete charge r 

GLASS JAR for No. 4866, for replacements 

aii' 
h 
pa 
th 

I 

m 

i 

fil 

a 

■SC^KFTfi ,r any eIe< * rona arc cmittP,l > ,,1 «' v ; "«' immediately attracted to the filament 
' t 80 .. tha . the . S as '•'•'"••""* non-condncUng. Since the direction of a current is OI - 
porta to the direction m which the negative electron a travel, it is evident that £e current 
passes .lunng each alternate half-cycle from the graphite electrode tc the tungsten fflamlnt 
fcrough the bulb. We therefore have in the circuit 'of the bulb a pulsating SSSi^SSS 

This Current is especially adapted to battery charging hut may ho used for many other purposes 

so.li as in electrolytic experiments, elect m-plating. tor running small motors etc 
Tungi.r Bectifiere are designed for 1 IS volt, 60-cycle circuit, but may he used on from 105 to 126 




I 



rhi* ■ • 

tbsi 1 
,i.«] 

taoa i* 8 * 

rhieh a*™ 





4S71. 



motor. 1-urnished with cord and plug for attachment to any Incandescent lamp socket 

No v fi 

Output, full load, watts i 5 o- i ' ,- 

Amperes, tall load 2 il 

Volts, full load "" -^ ?2i* 

eight, inches s i , ,-, 

Depth, inches ?g ™ 

width, inches ;;..;; ;:;:;;; ;;;;;;; Jg j y 

Shipping weight, lbs 12 ga 

Each 18.00 28.00 

Tungar Bulb only, renewal 4.00 8.00 

205 



C 

450 

6 

75 

14 

32% 

10% 

SI 

130.00 
8.00 













.t,„ ,,, VTI ,,| scn-A'i'iiK" CO.. CHICAGO, r B \ 

ELECTRICAL APP. < EN I H.M. W in.:wirn 





Nos. F4703-5. 



Nos. FJ711-13. 



RESISTANCE BOXES AND WHEATSTONE BRIDGES 

In the construction of our resist aim- I we um high grade rubber plates for the tops, of mffleii 

thickness to insure a firm anchorage for the brass bare, and the best obtainable wire. 

All .'nils are wound bifilar in anifonn layers and are practically from inductance and capacity 

so that any of the boxes may l»e ns.-.l in conduct ivit y experiments with alternating ■•urn-ntx. The mils 
are securely fastened t<> tin- t<ij». so tliat there is ii" 'iam;.-r of the ^| Is breaking loos, and destroying 

the colirieetioii'- 

Our plugs are provided with knurled hard rubber tops moulded on, which prevents removal. The 
plugs are carefully fitted, giving good contacts, and are placed sufficiently far aparl to insure easy 
manipulation. The brass blocks are heavy and separated bo thai the Insulation between may be 'leaned. 

We guarantee, without reservation, all i.om-s i,, I,, accurate within the per ceni claimed, and 

any boxes will be replaced that show faulty construction or >l<. no1 come up to the guarant I accuracy 

when compared with reliable standards. 





F4703. RESISTANCE BOX, Standard Design, for individual student use. We believe tins I. ox will be 
found to be superior to any s-olil at an •'qua I price. The total resistance is ill "inns, divided 
as follows: o.i. 0.2, 0.3, 0.4, 1, 2, 3. 4, 10, 20, 30 and i" ohms. The coils are guaranteed accu- 
rate to y* of 1%. For detailed description of construction, Bee above $16.75 

F4704. RESISTANCE BOX, same as No. F4703, but with guaranteed accuracy, 1/5% 19.00 

F4705. resistance BOX, same as Xo, 4703, but mil. total resistance of l.lll ohms, divided as fol- 
lows: 1, 2, 3, 4, Hi, 20, 30, 40, 100, 200, 300, 100 "Inns. Guaranteed accuracy, I •"'. .... 20.00 

F4711. resistance BOX, standard Design, with traveling plugs. The blocks are of ..ew and im- 
proved form, which enables the coils to be held more (irmly in position, and lessens the danger 
of imperfect contact between eoila and blocks. The traveling plugs add greatly to the useful- 
ness of the instrument, making it available for the con.,,.,, i-.,u . . i the E. M. P. of batteries 
and other tests by the potentiometer method. The total resistance is 1,111 ohms, as follows: 
0.1, o.2, 0.3, o.4, i, 2, 3, 4, 10, 20, 3ii, 4o, 100, 200, 300 and inn. Pot detailed description of 
construction see above. Guaranteed accuracy. 1/5* 55.00 

F4713. RESISTANCE BOX, same M X«, F4711j liu , „;,,, ^U] resistane,. 11.110 ohms, a- follows: 1. -• 

3, 4, 10. 20, 30. 40, 100, 200, 300, 400, L000, 2000, 8000 and 4000 57.00 

206 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



ELECTRICAL APP 



5 

Old \i. gpl 

'nnvatt TV^i 



- 



- '• 





















oh* * 









hi* 



„**- 




No. F4720. 




No. F4739. 





No. F4733. 

,^, RESISTANCE. BOX, L. » N Dial Decade Typ. In Ufa box the. are £■**•£ 

decade, consisting o one coil ■ f^K^ "arranged thai an, resist. e fro. to nine 

units resistance each ( -. «J, ^uu ana -< i «' . turninc the indicating handle to the sue- 

cessive positions of tl te « .. - 1 < . „,. the resistilI1 . ... m each decade eir- 

in the preceding one, and the total res w a variations may be ob- 

cuit. In this ma nn.T i -stances of: *™£dm£ benea^e top plate where they are pro- 
tained quickly and accurately. The contacts are oeneaw £ t £ ting h , T1 ,u,. bear upon the 

tected from dust and dirt. uult.j.l, I,.. > * . t •< » J , >pnt (lmvn :it SUi . h 

contact Btuds, each leaf "^"•."JWjg 1 ' " 'j ,' k in ,. ates the proper -.ting of the han- 

an angle as not to wear grooves in the stir dfc A U » | > N fn ,. UlIliliate any 

dle ,„,. each position. The rests anees are wou n 1 bififcr ^upon *o ^ ^ ^ 
inductive effect, and are accurate to 1/10 per com. > $50 00 

,, 90( goo and 9000 ohms. •jfcimeia&B BRIDGE ' Combined. Polished har.lwoo.l mahogany 
F4731. RESISTANCE BOX and WHEATaTONi. oxiv ^^ q{ n<?w ( , ( No . 

finished box with hard rubber top %-in« 1 th k- I lea ^ b ^ 

P4711) are osc.l. For other -l-ta.ls o '" < l *££• P.g, arp tw ,, v ,. in numb er, viz: 1, 2, 
„ uml „. r . i, io and 100 ohms one whs < hi rhi . m , ;l suremen1 is therefore from 

P47,, RESISTANCE BOXand W^ATSTONBB^ 

of the finest materials and first elass w » contraction are ae described on page 206. The 

sign (see No. F4711), and the other details of on t ^ ^ ^ ^^ ^ ..^ 4(U , ^ 

rheostat coils arc sixteen in number, VIZ . 1, -. . • 10Q and 10(ln onma on each side. 

3000, 4000 ohms. The bridge ^"•J^^uSi 'o 11,110,000 ohms. The binding post. 
The total range of measurement is therefore iron , iltimim contacts for battery and 

for battery, galvanometer and •g^.^JRSdS Sections are ^0%°* 1o& 

galvanometer are cnnvemcntl> V U ^; ^ lug8 . Guaranteed accuracy, 1/10*.... 80.00 

fines on the top of the box Has two^ JjaveUngJ ug Resistance Boxes -25 

F4739. BRASS PLUG. With knurled rubber top, asusea 






BB 






































ELECTRICAL APP. 



CBNTBAL sriKNTiFIC C O., CHICAGO, U. 8. A, 





No. F4743A. 



No. F4750. 



F4743A. RESISTANCE BOX and WHEATSTONE BRIDGE Combined. L & N Dial Form. This hoi is 
of ihr sain.- design and construction ;>s No. F4720, bnl is proi ided with five dials, one of which 
controls the ratio coils, the others serving for the introduction nf resistance in "t 1 ohm 
from I to 9999 ohms. Ratios oi .001, .01, .1, 1, 10, LOO and 1000 may be established between the 
two arms by means of the i itio dial. When a Kalance i s obtained 'lie total resistance is foun>l 
by multiplying the ratio dial Betting by the -■"" of tin' resistances indicated by tin' other four 
dials, Accuracy of rheostal coils, 1/10 per cenl ; ratio coils, l 20 per cent $70.00 

F47d0 TESTING SET, L. & N., Portable, a complete self-contained outfit for resistance measurements, 
Tli.' instrument consists of a five-dial Wheatstone l.ridgc of the type described under No. 
I ' 4 7 » ■• a . mounted in thi same case with a dry battery and a ru§ I galvanometer of the pointer 
type with suspended coil system. By means of switches conveniently located, tin- internal con- 
stions may be quickly ehanged for different types of measurement. By the use of an addi- 
tional switch tin- contained battery may l.i* disconnected and an external battery used, A 
hinged cover, in which is contained n wiring diagram with directions for operating, may be 
locked shut t<. protect the working part-. A stnip haii. II.- is provided for carrying. .Many uses 
will be found for such a set. The range covered by the coil resistances (] to 9,999 ohms by 1 
ohm) and ratio arms (.on l to lOOi » in multiples of 10) enable the Testing s.t to !„• i.m',1 for any 
purpose from the accurate measurement of small laboratory resistance to the measurement of 
insulation resistances up to a few megohms. It maj be also used in locating faults in tele- 
phone circuits by the Murray or Varley loop method, and for locating "opens", by the ad- 
dition of a buzzer and telephone receiver. 

The resistance coils are guaranteed to an accuracy of 1/10 per cent. The galvanometer has a 

coil resistance of only 200 ohms, and is sensitive to 1 megohm. In ease oi breakage of suspen- 
sion, the movable system is easily removed for repairs. 

Dimensions of ease, 8%x7%x4% inches; weight, 8 pounds. Complete with I klet of informa- 
tion and directions for use 100 00 



P4752. Extra Battery for No. F4750 

For Bttzzer and Telephone Receiver, see Physical Chemistry Apparatus. 

208 



.75 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. ELECTRICAL APP. 




No. 10436. 




No. F4763. 




ilJom " 
wiBUejBdli 



HcdWiWite: 

ni 

•■ 

faerM a*i 

tv uV « «l 

nil Men v 

■ ■ 
•rriig. to!* 

f breaks rf * 



tbbooUrt 



; 











No. 4960. 



No. 4967. 



10436. 



F47^., 



4960. 



4967. 



WHEATSTONE BRIDGE for Conductivity Measurements. Extended Coil Type, as developed 
at the University of Illinois. The bridge is of the usual slid.- wire form with a half-meter 
scale graduated on the upper half from 475 to 525 cm and on the lower half from to 50 
cm in 0.1 cm divisions. A wire of very low thermal coefficient but of high resistance lfl 
Stretched over the scale, and a sufficient amount is wound on two spools, placed at the ends, 
to make 1000 cm of total length, exactly divided as to resistance. By means of removable 
plug contacts, the bridge may be used either as a half-meter or as a ten-meter bridge. In 
this way the resistance of a'solution may be approximately determined on the half -meter 
BCale the plugs then removed and the exact point determined on the ten-meter Bi sale. •Bj 
using this bridge, readings can be readily made with an accuracy of 0.01 of 1 per cent. §40.00 

WHEATSTONE BRIDGE, Standard Slide Wire Form, of simple construction. A resist.nnce wire 
one m.-ter long is mounted on a scale graduated in millimeters, and provided with ■ sliding 

knife ed JOntact. The strips are of brass with no soldered joints and provided will, B Binglfl 

gap in each of two arms of the. bridge for known and unknown resistance < '/"'l'><; '' «'»»' nec- 
essary binding posts and full directions, on finely finished hardwood board, 12.5x110 cm. 6.00 

For other WHEATSTONE BRIDGES, see general heading, Physical Chemistry Apparatus. 

RHEOSTAT, Carbon, for use in battery testing, calibrating electrical instruments, phot. try, 

and -inv experiments in which a UNIFORM VARIATION of resistance is desired. Consists 
; f !■■ I "ar li.. inches square and % inch thick, mounted between eastings in a trough 

of asbestos slate so that pressure can be placed on them by a screw, thus a lowing a range 

nsistaace of from about 0.1 ohm to 8 ohms o, re, Mnn ^™f** e ZSKTvJu 

load for constant duty, 200 watts. A momentary overload of from ,00 to 10«»0 watts ma^b. 
applied without danger of injury 

BESS?. WSM .-»SSSS^ 

in the table below will be correct to within o%. 

Those r he„ st a, S are sabstantiaUy ***** - ^eleaf ^^"ScfK utaKof 
with oxidized wire of negUg-bia tamw a tare '°*«™* ,»' ! rl ,„,. r in scrirs Kitl , th , ,,„,, 

desired ranges. 



4.M.17 



I* 



No 

Approx. resistance, ohms. . . 
Max. cur. capacity, amps.. 
Each 



A 

6.00 



B 
1435 

M 

6.00 



C 

715 

.77 

6.00 



D 

357 

1.1 

6.00 



E 
177 
1.5 

6.00 



F 
6.00 



G 
44 
3.1 
6.00 



H 
22 
4.4 
6.25 



K 
11 

6.2 
6.50 



L 

5.6 
8.7 
7 00 



M 

2.8 
L2.3 

7.50 



20!» 






m 



ELECTRICAL APP. CENTRAL BOTENTIFIC CO, CHICAGO, U. & A. 




4:»6:» 






4973. 




ft#J 

CENTRAL SCIENTIFIC CO. | pA^ A ° Q 

NO. 4973. 

RHEOSTATS, Cenco Laboratory, Water-Cooled I' nut applied foi . In order to extend the 
usefulness of our laboratory rheostats we bave designed this form of wat< ih ,\ 

have applied the principle to the ftv< "i our air-cooled rheost Lts rated J" larg 

currents. The design is bas«d upon careful experimental work ? an. I the wa1 oli <! rh 

when supplied with tap water at the rati "i ap] mately l Utei pei minute, -u be caps 
of absorbing four times as much beat aa the equivalent aia cooled rheostats, In th^ manner, 
the current capacity of the rheostat is doubled and the beat dissipation oi thi 12-inch tubes 
incomes 1.73 k. .v. in laboratories having a water supply available, ve highly amend this 
form for exact control of current in experiments where the n quiremente exceed tho?< which 
arc met by the air cooli -l form of rheostat. When these rheostats are used without water cool- 
ing, the maximum current should not exceed 10 percent of the rated vain Th< water-cooled 
rheostats are provided with tubulations as ehown In the illustration, weld' I inti I plates 
which in turn are welded to the ends of the rheostat tub Tin- entire unit is white enameled 
ami the inside of the tube is covered with a protective coating to guard against rusting. In- 
(•Mentally, sizes A ami B are useful as laboratory water heaters, the A size hi iny attached to 
a 220 volt circuit and the B size to a 110 volt circuit. By connecting the entire rheostat aero* 
the line and adjusting the flow of watei for a definite rate, the temperature of tl tflowing 
water will be remarkably constant so that it may be used for maintainin it tempera- 

ture in connection with refractometers, polarimeters and other apparatus. No. »69A rheostat 
is also useful as an air heater on i 110 volt circuit, while two of thi se rhi ts in series will 
accomplish the same purpose on a 220 volt circuit Thes< applications of rh< i 'kethem 

extremely useful devices in the laboratory for drying of glassware and Othei purposes calling 
for a current of heated air. 

No A B C D E 

Approximate resistance, ohms 44 22 11 6 

Maximum current capacity, amperes. .. , 6.2 8.8 12.4 17.4 

Each §9oo 9.25 9.50 10.00 10.50 

RHEOSTATS, Dodge Design, providing a system of wiring whereby a Uenco Rheostat may be con- 
nected either in series with the load or as a shunt across the line, the change being made simply 




limited by the ratio of the load resistance to the total resistance of the circuit. The current 

through the load is varied in the same proportion. Bv tins connection it is impossible to obtain 

very small currents and voltages. By closing the switch and therebv shunting the rheostat 

across the line, a potentiometer effect is secured by means of which the voltage and current 

may be varied from zero to a maximum amount, which is the same as the minimum of the series 

connection. In this manner one secures the full value of the rheostat and in a simple fashion 

can run the entire range of voltage and current. Current rating is for continuous service with 

moderate temperature rise. Overloads of 50 per cent, and more are permissible on intermittent 
service. r 

The rheostats are mounted upon a base of asbestos slate (transits), provided with binding posts 
for connection to Ime and load, and with single-pol» single-throw switch. All connections sre 

plainly indicated on the base, and the rating in ohms ami amperes is stamped upon the slider. 

For maximum vrttoll"*//. ][ [[ [[[[[ " \ [ [] [[ \ \ ' ; \ ^ * Q /,,, ggO 

Approximate resistance, ohms n \ 4 vl 17; 

Maximum current carrying capacity, an pcres \\\\\\\ 6.2 SU 2.2 LB 

n 12.50 12.50 12.50 12.50 

210 






<r- 






CENTRAL SCIENTIFIO CO., CHICAGO, U. S. A 



ELECTRICAL APP 




No. 4982. 










■ ■ 

I 

ipiun 

- 

i 

■ 






D 

4 

10.00 

jt be vr 

.tto 

=■; ■ ' 

mo**™ 

nth b'»H 
1] fonn«f*J 

c i\ 






12J9 



■J\ 



4982. 



4900. 





r 

_ ._ _ ^ 

No. 4990F. Nos. 4990B-D. No. 4990A. 

RHEOSTAT, Cenco-Forsythe, Water-Cooled (Patent applied for). There has always been a need 
f<W a rheostat of large current capacity which should remain small enough in dimensions to 
avoid its becoming unwieldy. The Cenco-Forsythe rheostat meets the requirements by a very 
ingenious method of connections suggested by Dr. W. E. Forsythe of Nela Research Labora- 
tory. The limitation on the ordinary tube rheostat is the fact that the maximum cuirent is 
usually carried when the sliding contact is near the end of the tube. The result is that only a 
few of the turns of resistance wire are in actual use. By the application of the Forsythe con- 
nections, both ends of the winding are employed in carrying current, and consequently it be- 
comes possible in the same rheostat to carry twice the maximum rated current for a simple 
rheostat of the same dimensions. It is accomplished by a switching arrangement and two 
sliding contacts which causes the current to divide at the ends of the rheostat winding, part 
ot it passing out through the one sliding contact and the other part through the second sliding 
contact. The use of two sliding contacts also permits very fine adjustment of the current, a 
feature not found in a simple rheostat with a heavy win. ling. By putting the rheostat wind- 
ing on a 2<J inch tube, which is water-cooled in the same manner as No. 4969 Rheostat, and pro- 
viding means for making the Forsythe modification, it becomes possible with one of these 
rheostats to carry four times the current which the same winding on an air-cooled rheostat of 
the Bame dimensions would carry. In listing the rheostats, we have indicated the maximum 
resistance values of each kind both as a simple rheostat and as a Forsythe rheostat. Corre- 
sponding to these maximum resistance values are indicated maximum values of current which 
can be continuously carried. 

No A B C 

Approx. maximum resistance, ohms 20.2 & 5 10.1 & 2.5 5.1 & 1.25 

Max. current capacity, amperes 10 & 20 15 & 30 20 & 40 

Each $15.00 15.50 16.00 

RHEOSTATS. National tapered (i. e., having the first step of greater current-carrying capacity 
than the others). These are inexpensive, variable rheostats for use in the laboratory where 
small current carrying capacities, comparatively small iesistances and small wattage consump- 
tion aif lu'M-ded. (For rheostats of large resistance, high current capacity and maximum dis- 
sipation of energy, see Nos. 4967-4982.) A rolling contact insures long life to the resistance 
element. 
No A B D F 

Maximum amperes, first step 1 2 4 6 

Ampere capacity, with entire rheostat in circuit.. 0.5 1 2 3 

Total resistance, ohms 80 40 20 13.3 

No, of steps 228 250 252 140 

Each 6.00 6.00 6.00 10.00 

211 






ELECTRICAL APP. 



OBNTEAX SCIENTIFIC OO, CHI< iGO, D. ^A. 









No. F3865. 



No. F3867. 



No. F3871. 



No. F3873. 



F3865. TRANSFORMERS, Laboratory. For use on 110 Volt A. C. Circuit* to give alternating currents 
at from 2 to 28 volts, which will operate all classes oi small electric apparatus < A.C.orD.C), 

including induction coils, motors ami small lamp-. 

These transformers arc indestructible, being enclosed in a steel shell, and operate on loo to 125 
volts, 60 cycles. The windings are embedded in an insulating compound making them imper- 
vi.ms to moisture and cementing the entire winding into one solid block. 

They are equipped with a new voltage regulator, which e limina tes the necessity of a rheostat 
for controlling tin- secondary voltages and permits of the voltage being varied in steps of two 
volts. Voltages i. 6, 8, 10, l-» and 18 are obtained by connecting to binding posts on the 
transformer without the use of the voltage regulator, and any of tln-so six different voltages 
can be used simultaneously. 

Each transformer is furnished with plug and flexible attachment cord for connecting trans- 
former to line circuit, as well as set ondary terminals on thi ondan, side, and bears a name 
plate giving complete enumeration of the various voltages obtainable from it. 

No B C 

Capacity, watts ion 150 

Dimensions, inehes 5x4x3$ 5^4x5x4 

Weight, lbs v 11 

Each S6.00 7.50 

F3867. TRANSFORMER, Laboratory. To meet the demand for a transformer of smaller capacity thai 
those listed under No. P3865, there has been developed a transformer of tl - .tne general de- 
scription but smaller and having a voltage regulator giving eleven different \ oltagcs in steps 
of L'lj, volts, starting at 2% and going up to 27% v. .Its. It is 3 :t , x;: x :; inches, weighs 3 pounds 
and is designed for au output uf ."o watts 3.20 

r:is71. TRANSFORMERS. step-Up. These Transformers r«>pie>,-nt the highest type of construction, snd 
are perfect in every detail. Constructed with a magnetic shunt control to protect them from 
all undue current surges, hesigned to nmunt to any alternating current circuit No imped- 
ance coil or other resistance necessary. Can be used for Wireless Work, Generation of Ozone, 
Testing Insulation, Electrostatic Separation, High Frequency Experiments, etc. 

For operation on voltages ranging between 100 and 125 A. ('., 60 cycles. Current regulates as 

per table below. No " rj C 

Kilowatts 1 

Secondary voltage .....'.'.'.'.'.'.'.'.'.'.'.'.'.'..'. 10 000 20,000 

Primary amperes ., t ' u 9 >_'i ., to 14 

Height, inches I,, P4 

Width, inehes [[' - g 

Length, inches j 10 

Weight, lbs II J 6 

Each '...'.'.'.'.'.'.'.'.'. 28.00 40.00 

F3873. TRANSFORMER Step-Up, rfniilar to No. F3871, but without the magnetic shunt; especially 
weight, 13 lbs. .'?!. W ° Capad1 * * kw -i secondary voltage, BOOOj sine, 9x^x6 inches: 

F3875. ^^^^W^dactlye, for use with NV. r:'.s 7 l-3, connected in shunt arn.ss the primary 
terminals for prevention of inductive kick backs in the primary circuit Per pair *50 

212 



I- 



m&L. 



an 



E«4» 



CENTBAL SCIENTIFIC « O., CHICAGO, U. 8. A. 




I making tkaj 

««{t • 

1 ii &* t] 
kriiaflttr 
■J iiffeal 

for fOU«tuj; 

m it. 



B 
MO 






smaller a^i\ 

- 
rent voltipai 



to protect \\a* 

■ 
■■- 

furrent r*** 
B 



000 



3 


I 

00 



i 
It 






,-••• 



F: 



ELECTRICAL APP. 





No. r3S79E. 



No. 5100. 




Nos. 5302-3. 







Nos. F3405-6. 



No. 5106. 



No. £112. 





No- 5113. No. 5114. No.r.116. 

F3879. TRANSFORMERS Bell Ringing. Designed foi ringing bells and buzzers and operating annun- 
ciators, burglar-alara .systems .and gas lighting systems. They are intended fur connection 
directly t ; . the 10-volt, 60-cycle A. C. mains, are absolutely fireproof and mav be shor^i c ed 
imNdimtely without burning them out or impairing their efficiency. Dimensions, IfalO.f.xl 1 cm. 



5100. 



5102. 



Secondary voltage g.lJ on 

Capacity, watts !!!!!! 60 

Weight, lbs - , 

Each gg q"q 

WATER BATHS, bee general heading Water Baths. 

ELECTRICAL ACCESSORIES 

ATTACHING PLUG, fusel. iss, Edison, black moulded material with separable plug (No. 5116). 



C 
6-12-18-24 
100 

9 

8.00 



107o discount in lots of 10, 20% discount in lots of 100. 



33 



5103. 
5106. 

5112. 



6113. 



P340S 



F3406 
P3409. 



• r »114. 
5116. 



attaching plug for multiple work, porcelain. One end fits any Edison receptacle or socket 
and the other is provided with Edison socket for incandescent lamp. At the side is a separable 

plug (X... .-.lliii lor attaching a lamp cord which will be in multiple with the lamp in the 

Bocke * 90 

ATTACHING PLUG for series work. Same as No. 5102 except that the lamp cord ivili be con- 

necte.l in series with the lamp in the socket 1 40 

CUT-OUT, Standard Plug Fuse. Double pole, Edison sockets, slotted porcelain base7 for 125 

volts, SO ampere-. Without fuse plugs .33 

10% discount in lots of 10. 
FUSE PLUG, Edison, Repeater (patented), containing six links each of which may in turn be 

moved into the proper position to replace the one previously burned out, by turning the handle 

at the top. When all are used up, the link holder may be unscrewed and a new set of links 

quickly inserted. Xo 

Carrying capacity, amperes 

Each 

RENEWALS for No. 5112, consisting of <5 combined links .... .Each 

For FUSE WIRE Bee No. 14438. 

LAMPS, Incandescent, see general heading Lamps. 

POLARITY INDICATOR. Indicates instantly the negative and positive poles when connected 
in circuit, size, 2.5x9 cm. Nickel-plated shell which covers and protects the glass tube from 
injury. For voltages up to 50 2.70 

POLARITY INDICATOR. Same as No. F3405, but for voltages from uO to 600 2.70 

POLE-INDICATING PAPER. When two electrical leads, or terminals, are placed dose together 
upon a piece of the moistened paper, the negative pole shows a red stain. In books of 25 strips, 
7x1 <"> Per book .15 

For PUSH BUTTONS see Nos. 1198-1200. 

For RADIO APPARATUS, send for CATALOG W. 

RECEPTACLE, to lake No. 5116 Ping, for oj.ru wiring; porcelain .45 

PLUG, for No. 5114 Receptacle, with two finger contacts; black moulded material. Used also on 
Nos. 5100, 5102 and 5103 30 

213 



B 


C 


I) 


E 


6 


in 


15 


30 


.35 


.35 


.35 


.35 


.20 


.20 


.20 


.20 












ELECTRICAL APP. 



CENTRAL s ( ii NTIKK -<>. CJ1ICA0O, D B. A. 









No. 5120. 



No. 5118. 





No. 5128. 



No. 5128 
Shell. 




IT 

No. 5130. 



No. 5124. 




No. 5134. 




No. FJoil 




No. F3542. 





No. 5132. 



Nos. F3561-3. 



No. F3543. 



5118. 
5120. 

5122. 

5124 
5128. 



5130. 



F3541. 

P3542. 

F3543. 

F3544. 

F3561. 

F3562 

F3563. 

5132. 
5134. 
5136. 



receptacle, Key, for open wiring, Edison; porcelain base, brau ell si.10 

RECEPTACLE. Keyless, for open wiring, Bdisonj porcelain 28 

10'; discount in lots of 10, 20', discount in original package of 250. 

RECEPTACLE, Mounted. No. 5120 Receptacle mounted on :i \\ i bast 10x10 em. with bind- 
ing posts. Suitable for use with any Eo'ismi l.asi- iniau.lesceni lamp 1.40 

RECEPTACLE, Miniature, porcelain, for X... sismi I..- n,|.s 18 

10% discount in lots of 10. 

SOCKET, key, E.lhon, l.rass, for use on lamp oord; may also be used » % inch I. P. si ze male 
thread. Of new design, having the two parts «f the Bhell beld together bj a threaded bn 
ring which is readily rmiuvnl when the socket is to be rewired. Illustration Bhows construe- 
tion clearly) go 

10% discount in lots of 10. 

SOCKET keyless, Edison, porcelain, with two finger contacts for use with No* 5100, 5102. '103 

ami >1 14 in place of the separable plug .42 

10% discount in lots of 10. 
SPARK COILS, Bee Induction Coils, 

SWITCH, Knife, porcelain base, single pole,aingle throw, 25 amperes. Base about ;:>- em.. .35 
SWITCH, Knife, porcelain base, single pole,double throw, 25 amperes. Base about 3.5x10cm .50 

««t^ H ' Knif6 ' porcelain *•*'' ,louhl " H".«i«ir> throw, 25 amperes. Base about 5x6.5 cm. .55 

switch, Knife, porcelain base, double pole, ble throw, 25 amperes. Baaeabou elOcm .80 

SWITCH, Wood Base, l point, about 6.5 cm in diameter . .20 

SWITCH, Wood Ba^e, 2 point, about 6.5 cm in diameter .22 

SWITCH, Wood Base, 4 point, about n.:. cm in diameter 40 

^wtt™ t> *Z1 dl T unt in lots of 10 from Ust prices of nos.' fbmi tonm 

^^jSmSsssS'.^ " ,, . ,:n ,i - f ° r i25 - its « ,: -* « « *» «*■ -^a 

S TS:^ *>V 250 vol* oV less," 10 ampere'curre^ 

T ^^U^ e :: ] ' ,t]l ^ : ' 1 Lnch wi ' 1 "' «"**. bVsV qnaMtyj wm'noV dry" out." in" quarter 

TELEPHONE APPARATUS, see ' CATALOG ' F of Physical Apparatus ^ ^ ^ 

WIRELESS APPARATUS, see CATALOG W A PP»*»»- 

For other ELECTRICAL APPARATUS t», , «^ 

ArrAHATUS, sec Physical Chemistry Apparatus. 

214 



J 



r 



S41 



■ 




CENTRAL SCIENTIFIC PO amnion tt o . ™„ 
"* -u., CHICAGO, U. S. A. ELECTROLYTIC 



APP 





i 



No. 12860 (Shown 
in use). 



X: ? ■ 






No. 12860 (Shown 

with Flexible 

Shaft). 



I 




J 



No. 5150. 




NO. 5140B. 



X: • , 



5140. 



0. 



P. ill 



' 









"' ' 



." 






m 






* t ^ 






]0 i»P* 



■ ■■' 






h- 



No. 12860 (Shown in 
Use with No. 12861). 

ELECTROLYTIC ANALYSIS APPARATUS 

ELECTROLYTIC OUTFIT Braun, for the quantitative separation of metals. Extensively used 

this method in less than half an hour. The apparatus is equipped with a motor mounted at 
one sufetO which a line shaft is attached, from which each unit is driven bv a Z *U fric 
tion device enabling the operator to use one or more units at one time. The speed is ref- 
lated by a rheostat. _ A separate rheostat controls the current supplied to the individual 

be' If Th nit T A ''v inc [ iv i du ^ S V' if<h - ? e I 0lvillg am,des and K a,,ze cathodes should 

bo used. The ammeter, line shaft, bearings, switches, etc.. are all enclosed in glass to pre 

vent coming n i contact with acid fumes. The lower portion of the cabinet is covered with 
aluminum and the binding posts are also made of this material 

Direct Current is necessary and where Alternating Current oi.lv i, ,,bt ; ,inabl,. a Motor-Gen- 
erator Set should be obtained. (See Nos. 4826 to 4848.) 

Complete with ammeter, rheostats for motor and units, and Btands for beakers, with instruc- 
tions tor mounting and operating. Without platinum.electrodes. No., A I'. 

Number of units ' ' L . . 

Each S188 00 217 00 

^T r -Pn LATINUM ELECTRODES . for use with Nos/siittVlVsw/iea Xos. 10806C and 10812B. 

ELECTROLYTIC SUPPORT, with glass rod mounted on japanned iron tripod base, ring for 
dish with three platinum contact points and clamp for anode. Binding posts are provided 
on both ring and clamp. Height of rod, 11% inches; diameter of ring, 2% inches. 6 00 

St™5° LYTIC SUPPORT, same as No. 5148, but with two clamps with binding posts 5.Q0 
12860. ELECTROLYTIC ROTATOR, Cenco Variable Speed, consisting of a 1/50 horse power motor, 
carefully selected for the excellent characteristics, fitted with a voice containing a secondary 
shaft. The speed of this shaft may be varied by moving a friction-driven disk attached to ft 
across the face ox a metal disk on the end of the motor shaft. In this way the speed may be 
varied from zero to the maximum speed of the motor, about 3000 r. p. m. f rind the direction 
of rotation may be reversed without stopping the motor. Two interchangeable chucks are 
supplied with the rotator, one for holding a 6 mm glass rod for stirring purposes, the other 
for holding the wire or stem of an electrode. Two binding posts are attached to the frame, 
one of which being grounded is u?ed to carry the current to the rotating electrode; the other 
is insulated from the frame* and has an adjustable chuck to receive the connection and the 
stationary electrode. A clamp of special form is attached to the yoke by which the rotator 
may be .lamped to any support stand. By means of Flexible Shaft No." 12861 listed below, 
the motor may be swung to one side, away from conflicting apparatus or out of the range of 
corrosive fumes. 

Complete as described, with connecting cord and attachment plug, but without support stand, 

flexible shaft, stirring rod or electrodes. No A B C D 

A. C. D. C. 

For volts 110 220 HO 220 

Each 35.00 37.00 35.00 37.00 

1*861. Flexible Shaft, 12 inches long, for use with No. 12860, with guide to orovide bearing for lower 
end. Can be attached to support by any ordinary right angle clamp (see our No. 2914) 4.00 

215 



514S. 



5150. 






..., cmia'tiimc 00 CHICAGO, I' B. A. 
ELECTRO-TITRATI0N CENTRAL SCIEWTIPW <>., , 




























No. 10312. 



Fig. 1. 

Diagram Showing Electrical Connections. 



10312. ELECTRO-TITRATION APPARATUS, Ceneo Wendt, Improved Form, for determining the end 
point in electro-tit rations, and foi determining the concentration of hydrogen-ions (pH) in 
solution to the fir?1 decimal place 0.] | • 1 1 . rhis apparatus resulted * i « >ni .t suggestion by Dr. 
Gerald I*. Wendt, of the University of Chicago, that an Electro-Titration Apparatus be devel 
oped which would l"' simple in form ;"i<! economical in price, and which could I"' readily use*l 
by the analytical chemist or th.- bacteriologist, unfamiliar with the complicated and sensitiYC 
apparatus used by the physical chemist for his mon precise determinations. 

The Method 

The method i^ that made use of by Sildebrand and others in which the potential existing between 
the hydrogen (or platinum) and calomel electrodes, which depends upon tl stration of 

H, on or metallic Ions in the solution, \< balunci*d against that of >i dry cell by means of a 
variable resistance. The -i/' 1 and direction of the galvanometei deflection indicate to the 
operator the proximity to equilibrium and the proper direction to move the rheostat slider to 






secure it. Tin- voltmeter reading gives the potential of the system at the end point, which is 
characteristic foi each reaction. By plotting the readings of th< voltmetei against the 
amounts of reagenl added, a complete history may be obtained of each reaction, and 
potential corresponding to the end point determined Ensuing titrations may be carriei 
quite rapidly Bince the voltmetei s< rves as a guide to the stage of the reaction and thus 



vents the operator going past the end point. 



the 
ried on 

pre- 



Applications 

The fact that titrations may be made ami the end point accurately determined in solutions in 
which interfering r.d..rs, turbidity, precipitates, or other dissolved material preclude the use 
of indicators, makes the Electro-Titration apparatus invaluable to the analytical chemist. The 
rapidity with which determinations of hydrogen-ion concentrations may be made, without the 
necessity for titration, in culture media, body thuds plant juices, etc., renders it equally vat 
5J"**e i" the bacteriologist, biochemist, and plant physiologist. Plant control is easily effected 
by n- i^c in those industries in which reactions are carried out on s large scale at a certain 
tmit.- Mci.hty or alkalinity, and it is beiny successfully employed for this purpose in Textile 
Dyeing Plants, Dye Manufactories, Bleaching Plants, and Gelatine Factories. Bv the use of 
this method, investigations have been or are now being made and important eonduaions 




(Continued on following page.) 

216 













I I 






CENTRAL SCIENTIFIC CO., CHICAGO, . s. A. ELECTRO-TITRATION 




- u 



rh ttuA 
I ma- 

admttifcl 



B i««l « <*£ 
ail H**.' 

^ nu-1'- ""J, 
ile »« * 

^■•^■23 

*r**n 

L 



ELECTRO-TITRATION APPARATUS, Cenco-Wendt-Continued. 

General Description 
The essential parts of the Wendt Electro-Titration Apparatus are the electrical assembly con- 

of Bakelite; and tl, chemical assembly. .J^V^^S^Z^Z clTl" o^ 
tterese'voir tor potassium eMoride solution, th, .null support rod, with eSS .„ the ■ t-' 
trodes , and the central .support rod with special enameled rapports Cor beaker and reservoir 
and t with clamps for the reservoir and burettes. The parts ire mounted on an Con base eov' 
eredwith a coating of durable white porcelain fused-on, which provides a work table whirl. 

can be kept dean and m unaffected by chemical reagents. The i selain base is designed s „ 

that the pa. up,,,, which the instrument board is mounted is raised about one-half inch above 
the reel -t the base, making it impossible for chemical reagents to creep beneath it and short 
circuit or corrode the connections. 

Electrical Connections 

The connections are shown in the diagram on the pr.-c, ig page. The apparatus is completely 

wired, it being necessary for the operator merely to fasten the connecting wires of the two 
electrodes to twa binding posts on the instrument board. 

Essential Parts 

The voltmeter is made expressly for the Wendf Apparatus by the Weston Electrical Instru- 
ment Co. It has a scale 4% inches (110 mm) long, graduated to read to 1.2 volts by m.iii volt 

divisions. For the convenience to the operator, p|[ units are indicated on the lower side of 

the scale. 
Tin minor scale ami knife-edge pointer enable readings to be made to 0.001 volt by estimation. 
The galvanometer was designed and built by us for the Wendt Electro-Titration Apparatus. Its 

sensibility and other characteristics are properly proportioned to harmonize with the other 

parts of the electrical system. 

The rheostat is of our Cenco slide-wire type, with resistance sufficiently high to permit the dry 
cell to remain permanently connected across its terminals. The number of turns \a such thai 

an accurate setting of the slider can be readily made. 
The hydrogen electrode is a modification of the rJildebrand type in which a platinum electrode 

ut' small surface area is used to reduce the time required for saturation. 
The calomel electrode is a modification of earlier type-, combining the good features of Beveral, 

such as the Btop-cock in the siphon tube, the bent v\u\ of the latter and the tubulature at the 

top with ground stopper. 

The porcelain enameled support for the beaker is provided with adjustable damps so that vari- 
ous size beakers may be used. 

Same method of continuous stirring is necessary in electro-titrations and in II ion determina- 
tions. For those laboratories which are not already equipped with motor stirrers, we recom- 
mend our No. 12860 Cenco Universal Motor Stirrer, which may be damped on the centra] sup 
port rod at the back and, by means of Flexible Shaft No. 12861, ;is shown in the illustration 
on page 216, provide proper agitation of the contents of the beaker at any desired speed. 

Other items not included with the outfit which must be supplied are the burettes, beaker and 
stirrer, \W strongly recommend the use of standardized burettes, since the accuracy of the 
determinations in electro-, as in other titration work, depends upon the accuracy with which 

the volumes of the reagents are measured. 
All parts of the apparatus are beautifully finished, the instruments in dull japan (rubber finish), 
and the support rods and clamps in polished nickel-plate. The combination of black instru 

mints an. 1 nickel (dated metal parts with the white porcelain covered base presents a beauti- 
ful appearance, making the instrument one which harmonizes with those in any well-kept 
laboratory, chemical or biological. 

ELECTRO-TITRATION APPARATUS, Wendt. Improved Form, as described above, complete 
with glass reservoir, hydrogen and calomel elect rodes, necessary clamps ami supports and with 
complete directions for use. Without burettes, beaker or motor stirrer $150.00 

10252. ELECTRODE, Calomel, Wendf s, only of No. 10312 7.00 

10284. ELECTRODE, Hydrogen, Wendf s, only of No. 10312 6.00 

Note: — For a complete explanation of the principles underlying elect ro-titrat ion, and for de- 
tailed directions for their application to various chemical determinations, send for Bulletin 86. 

12860. MOTOR STIRRER, Cenco Universal Friction-Drive, for use with No. 10312 for maintaining con- 
tinuous agitation during titration. Complete with connecting cord and attachment [dug, but 
without stirring rod. 

No 



A B 

A.C. 

110 220 

35.00 37.00 



C D 

D.C. 

110 220 

35.00 37.00 



For volts 

Each 

12861. Flexible Shaft and Guide, for use with No. 12860, enabling the Stirrer to be turned to one 
side, where it will not interfere with the working parts of the apparatus. The guide is 

attached to the central support rod by means of the right angle damp furnished with No. 

101512 



I 






4.00 



217 



'■ ■ ■■ 







EXTRACTION APP. 



OENTHAL SCIBNTOTO CO., CHICAGO, U. S. A 



4V 



I 



4 



IP 



4 











No. 5168. No. 5170. No. 5172. No. 5174. 



No. 5180. 



No. 5183. 



No, 5194. 



5180. 



5181. 

5182. 
5183. 
5184. 

5194. 



5195. 

5197. 



5198. 
5 1 99. 
5200. 
5201. 

5202. 
5656. 



Nos. 
5197- 
5202. 



EMERGENCY KIT, B66 First Aid Cabinet. 

5160. EMERY CLOTH, in Bhectfl 9x11 Lnch< 

N(( _ 

Per sheet $0.12 

Per quire - 30 

5162. EMERY PAPER, in sheets 9x11 inches. 

N O0O0 

Per sheet -^ 

Per quire 1-20 

5168. EUDIOMETERS. Bunseu's. with platinum electrodes. 

Capacity, PC 

Graduated in. • ■.• 

Each 3.10 

"170 EUDIOMETER. Bunsen's, wit I. platinum electrodes iduated to 500 mm in one mm divisions 

• 3.00 



.... 

18 

2 30 

ooo 

.05 

1.00 




,12 

2.30 

00 
.05 
1.00 



1 

.13 
2.50 



.05 
1.00 



i 



2 

.15 
2.80 

1 

.05 
1.00 

100 

1-, 

330 



EUDIOMETER. Hoffman's, see Lecture Apparatus. 
5172. EUDIOMETER. Mitscherlich's. with glass stop-cocK and platinum electrodes, Graduated to 50 

CC i n 1 -, t >• 1-00 

5174. EPDIOMETER, Ure's, U form, with platinum electrodes, 50 cc; graduated in .... 3.20 



EXTRACTION APPARATUS 

EXTRACTION APPARATUS, Bailey-Walker, consisting of a metal condenser, small glass flask 
of special shape, and a small glass siphon cup. This is one of the must compact forms of extrac- 
tion apparatus ami can be usi d for any kind of work. The flask is light and can be accurately 
weighed and easily cleaned. Made according to the design of Bailey and Walker, of the Bureau 
of Chemistry, United States Department of AgricultUTi Si Journal of industrial & Engin- 
eering Chemistry, Vol. VI, No. 6, for Juno 11»14. page 197 b.00 

CONDENSER ..nl v i. f Xo. 5180 , 4.40 



FLASK only of Xo. 51 .so 

SIPHON CUP m.lv of Xo. 5180 



.80 
.80 



GOOCH CRUCIBLE, Porcelain, 25 cc, with holes for -..-pension; for us.- with No 5180, for per- 
colation method ... .50 

EXTRACTION APPARATUS, Knorr's, modified by Walter & Goodrich. Complete with Con- 
denser No. 5195, extraction tube, perforated nickel lower disk aud flask for mercury Beal with 
holes for ether return, but without spring or upper perforated disk. • Circular No. 69, 

Bureau of Chemistry, United States Department of Agriculture | 5 - 25 

Extra Parts for No. 5194. 

CONDENSER only of No. 5194 with adapter sealed on 3.50 

EXTRACTION TUBE, improved form, without projection- ... -, in disk. Without wire spring 
or disk .60 

SPRING for Xo. 5197 to press sample against lower disk! ." .'. ,3 ° 

DISK, upper, for No. 51!»7, of ii i,-k. -1 "' . . ^, .25 

DISK, upper, for No. 5197, of platinum... at market price 

DISK lower, for Xo. 5197, of nickel AO 

DISK, lower, for No. 5197, of platinum .' ... Vat market price 

EXTRACTION PLASK, improved Corm, aa used in No. 5194, with tun hole's in nech for return 

flow of ether .70 



218 




M 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. EXTRACTION APP. 



PICKEL ELECTRIC EXTRACTION APPARATUS 



o 

K ft 

oo 






l#.~~* 




Walker. ! • 












.k v ' 

\ 



c 
N( Sectional Diagram Showing 

Details. 

5*03 EXTRACTION APPARATUS, Pickers, designed by the late Dr. J. M. Pickel of tbc Feed Lab- 
oratory of the North Carolina Department of Agriculture to permit the more rapid and 
convenient handling of routine extractions of feeds in experimental station work. Not only 
, nter rapidity secured through the use of tins apparatus, but also greater economy is efj 

f,,u,l due to the small amount of ether required (15 cc , the recovery of % to £ of £» "* 
the small amount of space occupied by each unit, permitting 20 to be used at one time on a 

Tl^' •,n , ;!u S Tmen\ 0t for l ro , c'overing the ether is very ingenious. The detail; of a single unit are 

l lo fthe line drawing, wh-re H will be noted that the metal Wjdenee. ends : m an ee- 

etntricaUv located point. An ether recovery cup of metal rests on the crucible below this 

noii When the apparatus is turned to the position shown, the ether condensing on the 

; 'drips Hirough the small funnel upon the sample in the special ; *^™J™ b ^ 3 

he extraction is completed, the apparatus is turned a JfJ J^g^f *£ the bottom of 

ether drips into the recovery eup. The residue in the crucible and the fat in the bottom 

an outlet which may be connected by rubber tubing to the sink A ^catch oa i 

from the horizontal pipe to catch any leakage J™"i the stnp^ oiks and ^ J . fted 

trough. A wooden bench furnishes "PPort for th eh t p late Ik o ^^ 

when one desires to remove the extraction tubes and ma> be h Mg ov e g 

trough, when not in use. When the outfit is permanenth nm. :f ; It th ** aet eco . 

sets of glass cylinders with special alundum extraetion crucibles, etner . r 

condensers, iron piping and BUpports. ^ B 

No '.I 110 220 

*For volts $275.00 275.00 

5203C. EXTRACTION APPARATUS. Pickel. coasting 'jj'^fg^S^ ^ -» "^ ™° 
glass cylinder, alnndum crucible, metal condenser andh eUw recover) cup... ^ LM 

52031). ALXJNDUM CRUCIBLES only of No. 5203C, for replacement ^^ 1M 

5203E. GLASS CYLINDERS only of No. 5203C, for replacement 

219 



m 






EXTRACTION APP. CENTRAL BOBNTIFIO CO., CSICAOO. UJB. h 









t3 C» 







!?•■• 



I 




No. 5204. 



No. 5206. No. 5212. No. 5213. No. 5214 C. No. 5214D. No. 5216. No. 5218B 



5206. 



5207. 



so 



209. 

5210. 

5212. 



EXTRACTION APPARATUS. Reed 'a, of polished copper, Eoi bark and n 1 extra Wideh 

used in tanning laboratoi i mpietc with Soxhlej spherical eondenaei $42.50 

EXTRACTION APPARATUS for Rubber Insulating Material, aa recommended by the Joint Rub- 
ber Insulation Committee, Cona its of a glass flask of special size with eond< of the Cottle 
or Underwriters' form and glass siphon cup, naadi to the exact specifications of the 
Committee. See Journal of Industrial and Engim « Chemistry, Volume IX 5 r . 

March L917, pag< 310) '....'. ' 300 

CONDENSER only of No. 5206 "' 2 ioo 

FLASK only of No. 5206, of Pyteac Glass. Numbei in original ,72 Each .32 

Per original case 

SIPHON CUP onh of No. 5206. Takes an 80x22 thimble 



20.73 
.70 



EXTRACTION APPARATUS. Soxhlefs. complete with No. 5646 Flask, No. 5213 Extraction 
Tube ami No. 5215 Allilm'.- Condenser, fitted with fine grained cork stoppers for 1 



No 

Capacit] to top ol siphon, cc 

Eeighl of siphon tube, nun 

Approximate inside diameter, nun 

Suitable for extraction thimbles, mm 

Length of condenser jacket, inches g 

Size of flask, cc inn 



B 
75 

7li 




210 

113 
50 



- "•.-::: 12."ix43 



Each 



5213. 
5215. 

5214C 



3.50 



8 
150 

4.00 

2.00 
1.40 



10 

4.50 
2.40 
1.50 



52HD. 



5640. 



EXTRACTION TUBES only of No. 5212 15Q 

CONDENSERS onlj of N "... 5212 ] Eaen ' liQ 

CONDENSERS. Soxhlefs, for use with No. 5212, see tS 2.;4. 

EXTRACTION apparatus, Butt's Extraction Tube. Pyrex Glass, designed especially for 
cottonseed meal. The stem ia large enough to permil vapors to flow uj» into the tube and con- 
densate to Hom downal the same time, tn a aeries of testa, this form of tube was found to be 
more efficient than the type usually employed foi cottonseed meal. Bulla mai be extracted 
also with entire satisfaction. The extraction thimble (80x25 or si»x22 mm) should be rap- 
ported by :. eoU oi wire 01 a roll of gauze. This tube ,na> l.<- used in place of No. 5213 in 
me usual Soxhlet assembly en 

EXTRACTION APPARATUS. SmaUey's Extraction Tube! as' nsed hj the SouthVrn Co'tios Oil 
ompany. This tube, wbjfc retaining many of the goo, I features of the Soxhlet, has the ad- 
vantage -.i lower cost of manufaetun- and decreased frarilitv 1 7"> 

EXTRACTION FLASKS only No. 5212. " 

< lapacity, cc 



Approximate diameter of nock! mm! .'.'.'. l oS 

To take cork stni.tn'r, No 7', 

Por-l, 



Each 



1 r.O 
32 
18 

.20 



5216. 



Forother EXTRACTION FLASKS, see Flasks' Extraction 

■SfSS^^ W -ith a,, iointag nd. 

piew with three ii, t >ks gmiin.l to lit extraction tube. 



.-218B. 



X... 

Capacity to top of Biphon.cc 

Each 

6 00 



B 
75 

7.00 



->22ulJ. 



M SSb1S?JSSS^S ^'"'•'^Hop^-WrbioUo cTde , ™und I. 1 

v:,,,r ,, SI ' f 'iV ^ orTflask f " r mercury seal, preventing any eak of eth. 

•»"'. Capadtyd il:!:i!. 100 ce I '" M; a PP rorim ate inside diameter of extri n tube, 3 

"^HS!!^ ^foVmeVeu^siaiinpml 

For extra Flask, for Extraction' Appara^s, ' aee 'iksM Extraction: " 

220 



250 
35 

20 
.22 

Com- 



8.00 

fit 

r 

a 

7.50 

t 

7.50 



M 






t. 



M 



^^H 



r I 



! 






^ 



J 







l. 



5*13 

oppmfo 



3-50 in 
L30 m i 

1J u 

mm i {bout K 



- . 



- 






B 

- 

- 

|L 






■Kfcar 7 



d»l 










CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



EXTRACTION" APP 







No. 5245. 



No. 5222. 



No. 5226. 



No. 5232. 



i 



No. 5238. 






No. 5249. 



No. 5255. 



No. 5256. 



5222. 



522G. 

5227. 

"228. 
5229, 
5232. 



5233 
5235. 
5184. 
5238. 

5239. 
5235. 
5245. 



5249 



"i2.-)5. 



5256, 



EXTRACTION APPARATUS. Teas', for the extraction of tanning materials, 
sociation of Official Agricultural Chemists. Consists of a heavy copper 



as used by the As- 
avy copper flask of one liter 



capacity, fitted with ground in copper extractor lined with tin, and a tin lined copper Soxhlet 
^ v'.^Y !" C tu ^\P r <^d for removal of percolate and for Hooding the contents of 

the extract. on tube. Height, 18 inches; diameter of flask, 7 inches $27.00 

CONDENSER only of No. 5222, see No. 3234. 

E ^ RA . C "° N , ^Pf**™* Underwriters' Laboratories Improved Form, with glass siphon cup. 
(See Standards for Rubber Covered Wires and ('aides,' ' 1018 I 3.35 

CONDENSER only of No. 5226 " 2 20 

EXTRACTION FLASK only of No. 5226, of Pyrex Glass , 32 

SIPHON CUP only of No. 5226 .......... ". .76 

EXTRACTION APPARATUS, Wiley's, consisting of nickel-plated copper condenser, tin lined. 

special form, with suspended porcelain Gooch crucible, arranged to fit into straight glass tube 
with ground flange, rendering the use of stoppers unnecessary. Both residue and extracted 
matter may be easily weighed 7.40 

CONDENSER only of No. 5232 600 

GLASS TUBE only of No. 5232 [[ .90 

GOOCH CRUCIBLE only of No. 5232, with hob's for suspension 50 




GLASS SIPHON CUP only of No. 5238 90 

GLASS TUBE only of No. 5238 90 

EXTRACTION THIMBLES, Alundum, for the extraction of soaps, fats, food, robber, etc., by 
both organic and inorganic solvents. Very rapi.l, practically indestructible and readily (leaned 
by ignition. Medium porosity carried in stock. Fine and coarse porosities can be supplied on 
short notice. Thickness of wall, approximately 1 nun. 



No 

Length, mm.. . 
Diameter, nun 

Each 





FlatBotto.11 




Bound Bottom 


A 


B C- 


D 


E F 


55 


70 80 


90 


100 127 


35 


25 30 


19 


34 45 


.80 


.70 .75 


.60 


.90 1.00 



EXTRACTION THIMBLES, Seamless, made from the same material as first grade Analytical 
Filter Papers and rendered fat-free by a special chemical process. Can be used repeatedly. 
No ' A B C D E 

Length, mm 90 80 80 '.'4 123 

Diameter, nun 19 22 33 43 

Per box of 25 3.15 3.15 3.55 4.40 7.10 

EXTRACTION APPARATUS, Riihrig, for the determination of fat in milk and dairy products, 
by the Boese-Gottlieb Method, adopted by the Association of Official Agricultural Chemists. 
With side-tube and stop-cock for withdrawing solvent. Unstoppered and ungraduateoT. On 
wooden base. (See Association of Official Agricultural Chemists "Method- of Analysis", 1920 
edition, page 227) 3.50 

EXTRACTION APPARATUS, Biesterfeld modification of the R.ihrig Tube, for the estimation 
of fat in condensed milk and milk powders bv modified Roese-Gottlieb method. (See Jour- 
nal of Industrial and Engineering Chemistry, Vol. IX, No. 12, for Dec, 1917, page 1111) 4.00 

221 









EXTRACTION APP. CENTRAL BOIBMTDTO CO, CHICAGO, V. B. A 













NO. 5260 



No. 5261. 



I 



I 






EXTRACTION APPARATUS HEATERS 

5260. EXTRACTION APPARATUS HEATERS, Cenco Electric, suggested by TV. II. IWs, consisting 
of a boa of asbestos hoar.] itransite) 80x20x12 cm, across the bottom of which are placed 
longitudinally six heating coila of resistance wire. A galvanised iron shelf or pan. placed 
just above the heating coils, entirely rh.s.s off the heating chamber and prevents any pos- 
sibility of ignition of inflammable vapors by the heating coils. The ash atoa board top, which 
js removable and is reinforced with angle iron to prevent warping, has six openings, 2% 
inches in diameter, with removable covers, for extraction flasks. By means of two multiple- 
point snap switches, the six .oils may be connected i seeutively in the I ^ired 

and varying degrees of heat obtained, which will pem.it the us, of ai >lven1 wlu.se boil- 
ing point does not exceed that of water. By removing the top, the extraction Husks mav 
be placed directly on the pan which may be us,,l either dry as ., hot plate or. filled with water, 
as a water Lath. Ry supporting the Basks above the openings in the top, the instrument be- 
con.es a hot-air bath. Nickel-plated end support rods are provided with sily ad- 

justable ,n height equipped with wire spring damps for holding the extraction tabes, which 
can he opened with one hand. Any type of extraction apparatus mav be ased with this 
heater, as all parts are adjustable. 

Specifications 

Length over all, including legs, inches o d /« pm \ 

Height to top of box, inches g 03 ™ 

Height to top of support rods, inches ,,, m cni i 

Diameter of holes, inches j J f. "\ 

Power consumption, maximum, watts 

^^^^t^^^^ ° f — H -d and separable plug for a. 

No ' 

For volts ' A °. 

Each HO 2*> 

$90.00 90.00 

.".264A. EXTRACTION APPARATUS HEATPR ru^ ■ ., 

222 



UMMH 



-'*: ".:-_ 



of thai is 
isktif orpn,: 

■■■"■' 
•st« board st' 

\t c 

; rival iti 
itnetu fa* 

■ 

Taction ■ 
be *: 



■ 









9 



aribkp* 
A 
90.00 

with i»'^! 

.or J* 

nlli 



CENTRAL SCIEN TIFIC CO., CHICAGO, U. S. A. 



FERMENTATION TUBES 





No. 5276. 




No. 5278. 
No. 5286. 



No. 5280. 
No. 5288. 




No. 5282. 



No. 5281 (Shown in Use). 



No. 5290. 





No. 5292. 



No. 5294. 



5276. 



^u^^^^^^^^'i^^ sc ° ge,K " aI hcadi " g Hot Plates ' Electric - 

FERMENTATION TUBE, Durham, consisting of a Gx% inch (150x18 mm) test tube in whic 
is averted a 2x% inch (50x6 mm) tube. (See Durham "A New Method for Demonstrate 
the Production of Gas by Bacteria," British Medical Journal for 1898, page 1387.) 






5278. 



Per dozen 
FERMENTATION TUBES, Smith's," on glass foot'. 



No. 



$0.55 

B 

140 

15 

.40 



52SO. 



5282. 



Length of closed tul..', linn ......! US 

Diameter of closed tube, mm. . io 

Each ;.;.".'.'." v/.'.'.y.v.'.'/.'. y.y. Js 

10% discount in lots of 12. 
FERMENTATION TUBES, Smith's, without glass foot. 

No A 

L "iigth of closed tube, mm 1 15 

Diameter of closed tube, mm 12 

Each jg 

10% discount in lots of 12. 
FERMENTATION TUBES, same as No. 5280, but without bulb. 

No A 

Length of closed tube, mm -] j- 

Diametex of closed tube, mm \9 

Each 



B 

140 

IS 

.25 



5284. 

52s.;. 



10% discount in lots of 12. 



16 



.10 



5288. 
5290. 

5292. 

5294. 



CHART, Frost's Gasometer, for measuring gas in fermentation tubes 

10% discount in lots of 12. 
FERMENTATION TUBE, Standard, as adopted by the American Public Health Association. 
Length of closed tube, 140 mm; inside diameter of tube, 15 mm; diameter of bulb, 38 mm. On 

glass foot. (See "Stan. laid Methods of Water Analysis," 1915, page 137) 50 

10% discount in lots of 12. 

FERMENTATION TUBE, Standard, same as Xo. 5286, but without glass foot 35 

FERMENTATION TUBE SUPPORT for single tubes. Of wood with brass clip for holding 

Jabea l.oo 

FERMENTATION TUBE SUPPORT, of metal, for holding 10 fermentation tubes. Can also be 
used for test tubes, ureometers, and any tubes not less than 5 inches long 3.00 

FERMENTATION TUBE SUPPORT, Stull, designed to overcome the difficulty and breakage in 
handling the fragile glass-footed fermentation tubes in washing, sterilizing, filling and incu- 
bating. The support is arranged so that the feet of the two rows of tubes overlap, thus en- 
abling more tubes to be placed in the same area on the incubator shelf. Made of heavy sheet 
copper with shelves and slots arranged to accommodate six tubes. With cover in place, tubes 
can be handled freely without danger of breakage. Provided with handles to facilitate re- 
moval from sterilizer when hot. Dimensions 11^x3x1 inches. Without glassware 5.00 

223 



*' 



FILES 



CENTRAL SCIENTIFIC CO., CHICAGO, r. B. t 






-•> 



-'!««;, 



5298. 



- 100. 
5302. 
5306. 






.'314 



.-).' !!.-», 



5316 



53211, 



5322. 



■ ■-..■■ -s;Ks'W*>: ■'"**>■.'* 



No. 5296 



H~-»~-... 




No. 5298. 




No. 5300. 

FIGURES, Steel, sec Dies No. 3820. 

FILES, Rat Tail, bastard cut. 

Length of eul portion, inches 

Each $0.12 

10 , discount in lots of 12, 20', discount in lots of 144. 

FILES. Triangular, slim tapers, single cut, for use in the laboratory for cutting glow tubing. 

Length of eui porti inches 

Each 06 .08 

10 r ; discount in lots of 12. 20 , discount in lots of 144. 

FILES, Half Round, bastard cut. Length i if portion, 1" inches 

10 r ; discount in lots of 12, 20'; discount in lots of 144. 
FILES. Half Round, . ;i I pinct w I rasps. Length of cut portion, 10 inches 

10'; discount in lots of 12. 20'; discount in lots of 144. 

FILE HANDLES, Bofl srood with I ei rule 

10'; discount in lots of 12, 



13 



5 

.10 



c 

.15 



.12 
.40 
.70 
.07 



FILTERING APPARATUS 





Nos. 5314-16. Nos. 5320-2. Nos. 5320-2. 

FILTERING APPARATUS. Berkef eld Type, consisting of a porous iSr^! with metal 

neaa Piece and outlet tube, andprovided with glass mantle for holding liquids. Extensively 

from !i, ' SS b fl™ d, 1 « f : ' 11 k '"" ls . fi lt ring serums, toxins, etc., and in separating bacteria 

filtr r ' h y ^'""''V'" *"* ; " connection with Filter^ Maaks No. 5664, attached to a 

X,,. ' ' r ""' a " s ° f exhaustl "g a^. Without flash or pump. 

Height of 'cVlinder; inches! ;.'! ! A 2 ? * ? f 

^ameter of cylinder, inches. ...'.'.'.'.'.'.'..['. % V J J 2 

ffltering Cylinders o„,V of x' Vhku.' M L9 ° "° 2 ' 50 si ° 

Each";::: A r c d f 

1.15 1.25 1.25 1.50 2.00 

GLASS MANTLES only of No. 5314, of Pyrex glass 

Size.' "inches";; m A B r P E ,, 

For cylinder No -'-xl 1 . *%xl% 6x2*5 HxJ^, 13^x4*, 

Each .... ABc D F 

.95 1.00 1.30 

Bulletin No. 31 of the 
Can be used in filtering 

Bts of :i . vlin.ler of brass 
fitted witli :i l'nsteur-Cham- 

[LTERING APPARATUS^ fnt ,, i'r , '' ain -« ra!,n, ' ifv of reservoir, approximately BOO Be. 17-W 
bougie for serum filtration ^^ Uns ' Bn £g's Design, same as No. 5320, but with special 

* 17.75 




■J 



r? I 



^- 



cektoal acnaramo co, ohicaoo, it. 8. a. 



FILTERING APP 



5328. 



5330. 



5340. 



5342. 



5346. 



5348. 




/ 



I 



Nos. 5340-2. 



No. 5346. 




No. 5348. 



Nos. 5328-30, 




No. 5352. 




No. 5354. 



FILTERING APPARATUS for Soils. Brigg's Design, similar to No. 5320, but complete with air 

EM t ; ,HM T 1 °V su,,sta,,ti: " ,,as "- This roakes ■ ~* - ; ™ £2 ^ 

use u, soil investigations. Capacity of reservoir, about 2,0 ,,, C plete a, Illustrated is. on 



FILTERING APPARATUS for Serums, Brigg's Design. same 
bougie for scrum filtration 



piete as illust rated $39.00 
as \„. 5328, hut with special 



39.00 

TI!n, !£V?fl ^ ^^^^^ P'ench ,nak,, for UM with No, 5320 an,, 5328. 
Length overall. If) mehes; diameter of unglazed cylinder, 1 inch 2.60 

^™ (Bougie), for Serums, Pasteur-Chamberland, French make, for „,'' with Noa 



2.50 



5349. 



5352. 



FILTERING APPARATUS. Fitzgerald's Constant Level, eonaiatiag of a 300 cc glass reservoir 
having a long glass rod fitted with a ground stopper for closing the lower opening when fill' 
ing the apparatus. The liquid to be filtered is introduced through the opening at the ride 1.50 

FILTERING APPARATUS. Tray Porm, consisting of glass tray with ribbed bottom and outlet 
a one corner. The entire surface of the filter paper is utilized, affording four times as much 
aiMrwg surface from the same sheet as in a funnel. Takes filter paper 12x12 inches Widely 
user for separating liquids from impurities where the weight of the separated material is not 
needed. Complete with supporting tripod as shown 

Filter Paper for X . 5348 Filtering Apparatus, in sheets 12x12 inches. 

A. For rapid filtration per 100 sheets 

B. Heavy paper for finer work per 100 sheets 

FILTER BAGS of felt. 



3.50 

3.75 
6.00 



Capacity, quarts 1 

Each !..:::::::::;;:;;:*;;;;;;;;;;;;;:; 1.40 



3 
2.00 



5354. 



5 

3.60 



FILTER BALLOON. Pukal, of unglazed porcelain, for filtering solutions from outside by means 
of a filter pump. Height, 200 mm: diameter, 125 mm; capacity, about 400 cc l 98 

FILTER BOUGIES, see Filter Tubes Nos. 5340 and 5342. 



I 



225 



jn. 
















FILTER CONES 



CENTRAL SCIBNTiFH CO., « tilCAUO, P. a A. 



;,:-,.; 



rc.ru. 



53C0. 



rc,Q2 



5366, 



.V.6S. 



.'369. 






No. 5356. 



No. 5360. 



No. 5362. 






c.s.co. 

No.~5366. NO. 5368. 

FILTER CONES, Alundum. for rapid filtration by Buction, for use in an 1. to whith 

thej are attached bj a wide band of rubber tubing Thej h a largi Itennj^ area and can 
be completely washed free from all soluble Baits, aa the entire filtering area is within the fn 

nel. They may b mpletelj cleansed by reverse washing and ignition, and used repeatedly. 

Complete with wire stand for support when nol in use. Medium porosity only carried in stock. 
Pine and coarse porosities can l>< supplied on short notice. 

N,» A B C D 

Capacity,cc -" •"'" r '" 100 

Diameter, inches l :i i -' ! -■ 4 1 . 1 

Height, inches Iftfl 1T ~ - ; k, 

Each $0-30 .60 .85 1.50 

Rubber Gaskets for us.' with No. 6. No A B C I' 

For filter cone, ec 20 100 

Each 05 .0". .08 .10 

FILTER CONE. Best American Porcelain, glazed il ighoul except rim, with hnl-s .-iln.ut 1,5 

Mini in diametei . 

Xo 3 

I liameter, mm 50 

Length of si.le, nun I ' 

Each 108 

FILTER CYLINDER. Best American Porcelain, unglazed, with flange, for filtering solutions by 
means of a filter flask. Length, 115 mm; diametei inside, l<i mm; diameter outside, 20 mm; 
diameter of tlange, 50 mm . . .96 

FILTER DISCS, Perforated, Best American Porcelain, with beveled edge, glazed with exception 
of edge ami bottom. Diameter of perforations] l mm. 

No 3 4 6 " 

Diameter, nun 22 25 v ■"'" 

Thickness, mm •' g .-, 4 4 

Each '.'.'.'.'.'.'.'.'.'..'.'. .24 .24 .36 .46 

filter dishes, Alundum, to fit the ton of a glass funnel, for rapidly filtering large amounts 
oi material, Especially adapted for organic work. Filters thoroughly, quickly and without 
previous preparation. Medium porosity caried in stuck. Pine and coarse porosities can I"' 
supplied on short notice. 

No A B r 

Diameter, inches -'-. 4 " 

Depth, inches ' „ s .. 1 

Capacity. .■«• '.'.'.'.'..'.'... .'.'. 400 300 50 

Eacn ; ; 2.00 1.25 90 

Rubber Gasket, molded shape, for No. 536SA, 400 cc - 50 

FILTER FLASKS, sec No. 5664. 

226 




H 



_i i 



- 
- 

<A<llBti: 



B 



R 

.01 



I 



J5 



* 



u, wuu 9 



<: 



; : 




No. 5398. 



^SeUelcBur 4 Sc^jj, ^ 



Bhr,nl*n4 



Falten-Filter No. 588 



12',, cm 



No. 5400. 



FILTER PAPER 



5380. 




jgftrt IVM-" 1 


.1381 A 




5381B 


^laz^Jwirt^ 


5390. 


1 




• 




- 




• 1 




1 


5391 A 


• 


5391 B. 




5398. 


■ »m 




B ■ 


5400. 


I 





up in packages of 100 sheets with baud and covers. 

Diameter, cm 7.5 9 11 12.5 15 20 25 33 40 I" 

Per package of 100 sheets. $0.10 .11 .15 .16 .22 .35 .55 .80 1.25 1.50 1.90 

107c discount in lots of 10 pkgs., 20' ; discount in lots of 100 pkgs. 

FILTER PAPER, Ccnco, same quality :is No. 5380, in sheets 20x20 inches (50x50 cm). 

Per quire 50 

Per ream '.....,. 7.25 

FILTER PAPER, Griffin Gray, a strong unusually rapid creped paper of uniform quality. Ex- 
ti osively used in the drug trade mid tor filtering su„'ar solutions. 
Diameter, cm 10 12.5 15 20 25 33 40 

Per package of 100 sheets 16 .21 .28 .42 .60 .78 1.20 

20 % discount in lots of 100 pkgs. 

FILTER PAPER, Griffin Gray, same as No. 5390, in sheets 20x20 inches (50x50 cm 1. 

Per quire 50 

Per ream \ 7,60 

FILTER PAPER, Chardin, for Agar Agar. The filters are folded and packed in hexes. 

Diameter, cm 32 :,o 

Number in hex 50 l'". 

Per box 2.00 2.00 

FILTER PAPER, Folded, S. & S. No. 588, excellent quality, free from chlorine and acids. Folded 
iu such a way as to protect the points from tearing Especially adapted to pharmaceutical 
and technical work on account of their rapidity, due to the amount of surface utilized. In 
boxes of LOO filters. 

Diameter, cm 12.5 15 18.5 24 32 

Per "box of 100 80 1.00 1.20 1.80 2.80 

227 



'•EXTRAL SCIEN TIFIC CO., CHICAGO, U. S. A 



CLNCO 

QUALITY 

FILTER 

PAP£R 






LNTPAL SCIENTIFIC Co.. 

4bO Last Ohio Sired 



I hi, n{; 



7?t'SA 



No. 5380. 



FILTER PAPER 




No. 5390. 



«ft 









FILTER PAPER 



I I WTBAL s.'IKXTIKK- 00., CHK ', l T S- A. 



P 



A.D.L. 
FILTER PAPER 

FOP 
QUANTITATIVE CHEMICAL ANALYSIS 

.JMI/.' "XtW 

ARTHUR D.LlTTLEi«c 

C»KMIDCt.NA« 

or CtmiM,ScieHrirKCo..CHicACu,USA. 









No. 5402. 

A. D. L. FILTER PAPER 

After somr years of experimental and research work, the laboratories of Arthur D. Little, Inc., of 
Cambridge, Ma—, have perfected a process of manufacture of double-aeid-waahed analytical filter 
paper resulting Ln a product for general quantitative work whose established merit di es then 

careful consideration. 

Special Features 

A. I». L. Filter Paper i- the only paper made, in the entire process of the manufacture of which 
onlv distilled water La used. As a result a cleai white paper <>i* extremely low ash content is prodm 

The manufacturers have succeeded in combining Ln one paper the qualities of retentiveneae and 
speed, making it unnecessary Poi tin- chemical laboratory to keep several grades o d washed papei 
for theii various analytical separations. Their success maj bi judged from the fad that A. I). I.. 

paper has a penetrability lying between 15 and 25 s tds for 100 cc <>i distilled wat< - compared 

with speeds of 10 to 120 seconds £oi other low ash papers, and yet will completely a barium ral 

phate even when precipitated under conditions such as to ider the precipitate ui Uy fine, For 

method of determining penetrability, see Journal <>t* Industrial and Bngineerng Chemistry, Vol. XIV, 
No, 3 for March, 1922, page 199.) \ D. L. papei is faster than any other paper of equal retentiveness. 

Tin' tensile strength wet) of A. 1>. L« papei is unusually high, being, in fact, greater than that 
of any equally rapid paper which has been tested. Tins makes it suitable for use in Buchner funnel 
work and eliminates the necessity for a specially treated paper for tins purpose, except for determin 
ing crude fibre, 

Tin- rigid inspection of the finished paper employed by the manufacturers insures thai only perfect 
paper reaches the consume] Mo other papei must pass such a rigid examination of each circle before 
being put uj. in boxes. \- a result a uniformity is attained, not found in other papers. 

DETAILS OF LABORATORY TESTS 
a s.unpi.. nf ].a].fr is taken for lalioratorj testa from t very 30 pound i u El comes from the machine The lab- 
oratory teats made on these samples as well as the limita t<.r iacb testa are a 

Penetrability i 5 25 aeconda 

KwtM.tion of Baso^ 1 xcellenl 

Ash , 

Art per 11 cm circle o.Oi 1 grim 

rhickness, inch 007 

Bursting atrength, Iba. per %q, in 12 minimum 

«... , .„ (a) Penetrability 

u r*<?^Li< u V u7> EW^i h,y . ia obta *™ d ">'"" Ul " Littl « <•'»'"' '""' rn»rrstMna the number of seconds which 
SJS^SSJSmSm^A^^, i;"-.thmu,h a 2 inch circle of tin- paper under a constant 

a Sanet?IhiH?S - Sj^^^S^^^HJ'^ ?"& ls obt » in «*- On th, other hand many runs of paper show 
te^dt^ P«etrabiUt, of the fastest paper, on the a Cwhicb are not 

t , ■ ... . (b) Retention of BaSOi 

a, to riv? amS ch 5h,I?l^taSSSl? « ? ul P hat * ia »|w«y ? precipitated ander the san aditions, and in rach a manner 

tor! test i 1. til L h i'l " u "" M ," r " Ih I btained u, nod practice No paper passea the labora- 

tory testa which will not hold th, ,,r....i,„tMe formed 11...1. r thos,- unusually severe conditions. 

rnvji. ». ... , - , < c > Thickness and Bursting Strength 

While the thicknesa figure la not wed aa a baai, for acceptance or re$c\ion. y ..t a„ effort Es mada to hold the 

in making a onif apex Most of 

1. Th.a teat baa 1 dlr< I hearin? upon 
e bursting strength of \ P L. paper 
(I for general laboratory work. 

The ,.p,r which has passed the m»*nJ^'3tt*S2££~*.-* . . 

ana 

spot 

d 

a 

5402. 

Size, cm ' " mcacrioeq aDOV *i '» sealed boxes of 100 circles. 

P«Sl£;^ ::::::::::: : :::::::: "0^ .0,14 .JL ,;| 8 JMI 

22 s 





TJ-J 



I ■ 



&mP*& 



mz 



Vrthar I 



Ml DVtOM 






B 

'fa; 

tail tvtj 

- 
id! equal 

gmtefc 
use iafiite 

ion uf rich cos 
rr papers. 



M Eki 



- 






■aft 1 



E^ 



11 

ooot 

•00 





:- 



5403. 



5404. 



54U5. 



CENTRAL SCIENTIFIC CO., CHICAGO. U. S. A. 



FILTER PAPER 





5406. 



5407A 



.1407 H. 



54 08 A. 



5408B. 



5400. 



No. 5403. 

No. 5407B. 

FILTER PAPER, Munktell Swedish No 00 n .im.M„ „ i 
content of am- analytical papeTSad" Thfc . E > "J* - ! "SP" Ulth *• '"— * ash 

water used in Us man u fa, tun', u-hii the pe ul ar^rlcter ofth "W^;. ?"Hj °* "- 
for its superior texture. Put up in birch-bark L J, I - t,U ' l : 1,mal "' COnditiona * counts 

each. P ark boxes ' containing hve packages of I drclas 

Diameter, cm 

Ash weight, grams ' *' H 

Per package of 100 sheets JOOOS .00004.". 

ash content, widely used in thTanah si i of ifn , fir t " d 1 - C i J™** ***** " f low 

be used satisfactorily for th^'nH^o^ oflZo. "^ &J^£g&2 Bari^^hSe 

Diameter" em ....... containing five packages of 100 circles cad,. "_ 

Ash weight, grams An * 1H . _ '- ' 

Perpackage of 100 sheets. ..::::: ^JJ 7 -™g> -MOM 

Ash weight, grams [] [[ [[ [[[]["][[[[[[[ ,',[ ]\ JL* ' ' . 

Per package of 100 sheets ^lT 151 

FILTER PAPF^M^US SfS u ^ sort £ d si2es amounting to $100.00or above. 

Spa^r rmldf^ t SWedlSh ; 1 f - *?' "" unwash -« I«M"", with less ash tl.:,„ any Otbei 

Diameter, cm 9 \\ 1 2 5 j- |g g 

Per package of 100 sheets 6 .72 .96 1.20 1.80 

fttt-pt? -oa^-p^V 111 ! i° T ° rders of asg0rt8d ■"■" amounting to $100.00 or above. 

t , n Bf , «T' No - 595, with P lain surface - This is a goo.l light paper made of the 

onas. r ree from chlorine. Put up in packages of 100 sheets 

Diameter, em 9 n 125 j- 

Per package of 100 sheets '.'.'.'.'. .24 .28 .30 .51 

FILTER PAPER. S. & S. No. 597, similar to No. 5407A, but a stronger, more retentive and con- 

f!Th?«t y JHfr/ a ii.»L pa r ,,er - f i2!L£« of ■aSF wi " I >B,s though a 15 cm filter in 80 to 100 „,d s . This 

is the standard grade for qualitative analytical work 

Diameter, cm 9 n y. j- 

Per package of 100 sheets ..'.....".".'.'.'.' M .42 .52 .74 

FILTER PAPER, S. & S. No. 589', Black Ribbon, washed with bydrtehloric and hydrofluoric 
i, c 'V , ° r * du f e th ° ash weight for quantitative use. This is the most rapid of the 8. A 9 paper* due to 
rwfj« 4 t^ure. It should be used for larger grained precipitates which do not readily pasa through tho 
S»i t . the paper such as Silica. Iron, Aluminum and similar materials. It should not be u r Barium 

ouipnate. Especially useful in Cement and Metallurgical Laboratories. 

Diameter, cm a 1 1 

Ash weight, grams .00011 .00017 

Per package of 100 sheets 1.70 2.00 

FILTER PAPER, S. & S. No. 589 : , White Ribbon, similar to No. 5408A, but stronger and closer 

S.tSifey' rp, . a ' nin K" a" ordinary analytical precipitates. This is the standard grade for quantitative 
analytical work. Not so rapid as No. 540SA. 

Diameter, cm 9 ]\ 

Ash weight, grams 0001 1 .0001 7 

Per package of 100 sheets 1,70 2.00 

FILTER PAPER, S. & S, No. 575, hardened niters, for use with the filter pump. This paper 
has I-een specially treated to produce a tough smooth surface which .lings closely to the side* »( the fun 
nel and \vill resist, when moist, a pressure of 2 to 3 atmospheres (29 to 44 pounds per square Inch). It 
is very durable even after continued use and precipitates may be scraped from it without destroying its 
surface, so that one sheet may be used for several nitrations. Corrosive liquids nu li as sornfiona of 
stannous Chloride, Antimony Chloride, Acids and Alkalies may be filtered satisfactorily with this r . 

Diameter, cm 7 9 11 

Per package of 100 sheets. ....'..'.'.'.'.'.'.'..',]'.,.'.'.'....... 1-20 1.70 2.00 

229 






FILTER PAPER 



, | vi'KAL 8CIENT1 • CHICAGO, U. 8^ 



WHATMAN FILTER PAPER 




V CCHtusf * y 

*X WHATMAN ^ '. 

f I LTE R PAPER 



/ •*••• M | |* J. 


40| <•*•-« \ 


KBJBCT THB BOX IF 
■AND It BROKEN 




9 <H)wma» 


V DBOOM 


OBAHM / 















No jg No. 5438 (Reverse Side). 

WHATMAN FILTER PAPERS n ei e develo»»ed during the war by Met w . a i,\ Baltten, 
Ltd , of England, the manufacturers oi the well known Whatman Drawing Paper. 

The acid-washed papers come packed in well made cardboard boxes, • labelled and sealed 

t prevent handling, each bos containing 100 circles, The qualitative papers are in packages 
of urn circles, wrapped in bundl- - .-ont-amiM}- 1" pa.ka 

The grades listed below offer as assortment from which we beliei • maj wlecl b papers 

able to anj type of analytical work For convenience, we give the aumboi oi the Bchleichei 
& Schuell, Dreverhoff oi Munktell paper corresponding to each Whatman number. 

QUANTITY PRICES. 

Upon orders amounting to less than $100.00 list Net 

Upon orders from $100.00 to $200.00 lisl 

Upon orders above $200.00 1 

(Orders may be assorted as to kinds and sizes, bu1 must be placed a1 one time.) 

5410. FILTER PAPER, Whatman No. 1 (S. & S. No. 595). :i high grade rapid filter paper for general 
qualitative worli and for altering ordinary precipitates when the ash weight of the paper 
of no consequence. Widely used in Sugai Laboratories and for the filtration of yellow Am- 
monium Phospho-Molybdate after digestion, in determining phosphorus in fertilizers. 

Diameter, em 9 11 12.5 13 18.5 

Ash weight per circle, grams tmo7<J .0011 .0010 .ikilM .v 

Per 100 circles §0.24 .28 .37 .51 .71 

FILTER PAPER. Whatman No. 1 (S. & S. No. 595). same as No. 5410, but in sheets, 46.5 z 57 cm. 

Per 100 sheets 4.45 

Per ream (500 sheets) 20.25 

FILTER PAPER. Whatman No. 2 (S. & S. No. 597). a qualitative paper similar to Sfo. I, bat 

stouter, retaining fine precipitates. Thia is the standard grade for analytical purposes. Widely 

used in the qualitative analysis of the alkaline earths, and in general where fine precipital 

of crystalline nature are to be filtered. Especially applicable to Fertilizer. Cement, Steel, and 
Ore Analysis. 

Diameter, cm 9 ! ! ]L > - 13 

Ash -weight per circle, grams , nlll -> 0018 -0024 .0034 

Per 100 circles. [[ u M m .74 

FILTER PAPER, Whatman No. 4 (S. & S. No. 604). a soft paper of more -pen texture than the 
preceding. Extremely rapid, but not recommended for use with the finest precipitate* B* 

peciallv adapted for the rapid filtration of gelatinous and large particle precipitates such as 

Feme Hydroxide and Aluminum Hydroxide; also useful for Pharmaceutical purposes, suehas 

the filtration ol truit juices, syrups, oils. etc. Widely UBOd in Copper and other Ore Mining 

Sugar and Cement Laboratories. 

Diameter, em q 11 l-:. « 

Per 100 circles \\\\\\\\\\\\\\\\\\\\\ .40 .50 .65 •*> 

230 



5411 
54 1 2 

.14 14 



5420 



. 1 




qnmuL Wma nn „»„._ ft & 



FILTER PAPER 




No. 5462. 



5430. FILTER PAPER, Whatman No. 
paper of low ash c 

Phospho-Molybdat 



££££& n^iir r- ■"iy*** »* <>>. 



initiations and for general quantitati 



a single-acid washed 



..... ■-»«-- ~"« '»' Bcnerai quantitative work when thr lnu-« «- « u •' u,u,ncTric ^»»c doter- 

usod in Cement and Metallurgical Laboratories ° thc 1(mest ** «« not important. Extensively 



Diameter, 
Ash 
Per 100 



5438. 



weight per circle, grams 

00 circles 





9 

.0002 
50.90 



11 
.0003 
1.20 




o-v.-.um-nuiuiuuium Sulphate, etc. 

Diameter, cm 

Ash weight per circle, grama niuu - «« 9 

Per 100 circles E ° 00 "" -000082 

1-20 1.70 



r 



11 12..-I 

.00012 .00016 .000". 
2.00 2.30 2.70 




Diameter, em 

Ash weight per circle, grams 
Per 100 circles 



5442. 



and Steel Analysis. 
7 9 11 i o 5 

.00005 .000082 .00012 .0001*6 
1.20 1.70 2.00 2.30 




15 

2.70 



washed paper, 

of its close 

I'herc possible. 

as Barium Sulphate when precipitated 'in 'edd S""^ ffiSSft** - filt0r *****> s » ch 
work where speed is not important. solution, and in general for precise analytical 

Diameter, cm. 
Per 100 circles 




5452. 



Diameter, em 

Ash weight per circle, grams' ' n 

Per 100 circles 00005 .000077 

2.20 2.55 




18.5 
3.60 



24 
6.10 



5402. 



._.„ particles of paper when scraped off. Can be used as "a Bul^'l "iVi'iVo ' t Z 
Dimeter cm ^ " 8UPP ° rtS ^ ^ * ° Wed U *« t0 P revent *- E^ *tt ^£ 

per^cir^les::::::.:;;;;;;;;;;;;;;;;;; L2 J L7 g 2.0J 2.30 2.70 

For Quantity Discounts, see Page 230. 

^il^ l *; API i? ° A ??* 0f J a P anne<1 tin > convenient for holding filters of different sizes Will 
take 6 sizes from 7.o cm to 18.5 cm in diameter 4.00 

231 



' 



^^ r~ 










FILTER PUMPS 



I i:\tk.\L SCIENTIFIC CO., CHICAGO, r . R. A. 




No. 5468 



Plate and Frame of No ;>468. 





No. 5476 



No. 5478. 



No. 5486. 





No. 5480. 



No. 5482. 





No. 5494. 







5468. 



54 76 



547S. 



5480, 



54 nl\ 



.14 Ml. 

5492. 

5494. 



FILTER PLATES. Bee Filter Disks. 

FILTER PRESS. Experimental Form, for making practical testa on a small scale. It is of 
•d construction, with parts of iron, built to stand a pressure of 150 pounds to the square 
inch, Both corrugated plates and extension frames arc provided, enabling either filter paper 
or cloth to be i tnplete with reservoir, hand pump of Iron with bras- tralvcs, presmre 
gage, siphon, brass dis _•■ cocks, two filter plates, three frames, filter paper and cloth. 
Weight, about 125 pounds ' $80.00 

FILTER PUMP, Aspirator, new design, of brass. Very efficient 

No A 

Length, inches .V 

Size 1. P. thread, inches '- 

Each 1.35 

107t discount in lots of 12. 

FILTER PUMP, Richards', of brass. 

No A 

Length, inches 7 

Size Of I. P. thread, inches i v 

Each 2.00 

10% discount in lots of 12. 
FILTER PUMP COUPLING, of brass, to connect No*. 5476 and 547S to a threaded faucet. 



B 
1.50 



B 

7 

% 
2.90 



C 

5« 

% 
2.00 



c 

13 

% 

8.00 



No 



B 


C 


'. 


% 


.40 


.40 



D 

\ 
.90 



For filter pump, I. P. thread, inches u, 

Ea <* :..::::::::::::::::: .40 

10 r " t discount in lots of 12. 

FILTER PUMP COUPLING, of brass, to connect Xos. 5476 and 547s with smooth faucet. 

N " A B C 

For filtei pump, 1. P. thread, inches U '. 



Each 



i 



.60 



.60 .60 

10'; discount in lots of 12. 
filter pump, of brass, «■>. base, with vacuum gage and stopcocks on inlef and outlet tub; 

, . . 15.00 

FILTER PUMP. Geissler's. of glass . ' . 120 

FILTER PUMP. Muencke's, of glass ........-■ l9 ° 

232 



I 

■ 



CENTRAL SCIEN TIFIC CO., CHICAGO, U. S. A. 



5.3U2. 



5515. 



5516. 



5520. 



FILTER PUMPS 



MRSURC 



VACUUM, 




JoiSCNARGC. 

No. 0502. 






NO. 5515. 




No. 5516. 




No. 5520. 




itop-cocks. . . 

™SS5 m™? With Rese ™*. ^r blast and suction, aee No*. WW 

L™ *SS » C , a K b0I \x for use With Gooch c™«W«s, see No. 6124. 

FINGER COTS, Rubber, Heavy. No. v n r. 

For ' u 

Per rfr^Vn ' mal1 medium thumb 

*" d ° Zen ■■■■ • • 70 .70 .70 

107c discount in lots of 144. 




FIRST AID CABINET. A neat metal case, 8xli'x.:'_. in.). ■ - .|. •■ .-,., containing: one 1 inch 
gauze bandage; two 2-meh gauze bandages; one 2-inch cotton bandage to hind other dressiolts: 




have about the laboratory for treating cuts and bu 



ni> Tomplete as ilcxvribe*! 



5.50 




The illustration at tin* loft is n photographic reduc- 
tion of one of our thousands of blue prints by which we 
insure the accurate reproduction of seinit ific apparatus. 
Metal and wood workers have long been accustomed to 
work from blue prints and sp eifieation sheets, hut the pre- 
war glass blower worked very largely by sight, feel 01 
habit. As a result there were no standards of size and 
no uniformity in design. During the past seven years we 
have made a careful search of the literature for specifi- 
cations and have consulted freely leaders in the various 
scientific fields until we have secured as correel and an 
thentic information regarding specifications as possible. 
This information regarding each item has been i DC< 
DOrated in a master tracing, the blue prints from which 
are given to the glass blower as his Instructions. The fin- 
ished articles are inspected and cheeked by :i duplicate 
blue print. A supply of uniformly made glassware of coi 
rect size and design is thus made available for discrim- 
inating laboratory workers. When special pieces are mad< 
to order, similar tracings are mad'- and filed s., that ac- 
curate reproductions may be obtained by resi arch workc 
at any time. 



233 



M 



FLASKS 



, 1. . n;Al. m 11. .Mil I' I <>., CH» \u«», U. £ 











No. 5536. 



No. 5540. 



No. 5542. 



No. 5550. 



No. 5558. 









554 - 



FLASKS, ALL KINDS 

5536. FLASKS, Flat Bottom, Resistance grade, with vial mouth. 

Capacity . ec 50 I 250 500 1000 

To take rubber stopper, No I 6 

Number in original < . . 190 l 2 L60 ."u 

Each S 0.13 .15 .17 .20 .29 

Per original case 22 23 16.20 24.48 16.20 13.05 

5540. FLASKS, Flat Bottom. Pyrex Glass, with vial mouth. 

Capacil 60 L2S 250 

To take rubber stopper, No • > l 3 

Number in original cas< L92 1( iu 

Each .17 .19 -2 4 

Per original case 29.37 29.53 31.10 

Capacity, cc luiiO 2000 3000 6000 

To take rubber stopper, No 7 8 9 in 

Number in original case [g ]•_• j_. 

Each .43 60 7 6 L60 " 

Per original case 13.93 9i72 8 .20 17.28 

FLASKS, Fiat Bottom. Pyrex Glass, with hc&\ 1 ring neck. 

l,;' 1 '-'","^ •;, 500 1000 8000 3000 

ro take rubber stopper, No ;, 7 s ■ • 

Number in original case ][[ ■',-, | » io 

Per original case M<62 1? g2 12 63 1Q 6g 

FLASKS. Round Bottom, Pyrex Glass, with rial mouth. 

No . _ _ ,, 

Canacitv cc A B c D F 

T.'t, k .: ;,,..... ,.,;,;,;,:, v , ™ -°:; 300 500 1000 

JS bW ****» 84" 144 84 4 30 

Per original case 18 22 - 28 - 37 - 56 

original ca,e 13 6Q 2g &1 2Llfi ^ Qg ^ 

FLASKS. Round Bottom. Balloon Form. Pyrex Glass, with short ring neck. 
< ;i pacitv cc 

To take rubber'stonneV No 2 °S 500 100 ° 2< •' , "' ,, •" 00 ° 

^en , ": , : , --•' -'-.-•: ::::::::::: l4 J 7 i J JJ S 

Per original case ' 28 - 38 -55 -78 .99 1-40 

3628 24.62 17.82 12.63 10.69 7.56 

Capacity, cc 

Diameter of flask in 22000 500< 

Diameter of iieck'insiiir/in ] '"' , 18 

Number in original case y ' *% 

Each 8 4 

Per original case' " 7.00 16.00 

50.40 57.60 

234 



8 

.40 
7.20 



500 

6 

.30 
19.44 



120 
13 

6 

3.30 
17.82 



I 
in 
IS 
1.75 

18.90 



5550. 



555 S 



H 

9 

U 

.79 
12.79 



1 8000 

11 

6 

3.50 

18.90 

79000 

201... 

4', 

1 

38.00 

38.00 






~^^^^B 



IffiifiBffifrifeltflii 



<i:\TKAL SCIENTIFIC CO., CHICAGO, U. & A 



FLASKS 



I 



4 



No. 5570. 







No. 5576. 



No. 5584. 



No. 5600. 



No. 5602. 




No. 5606. 



5570. 



'" • 



■ 



« ltt) u, 



- : 
: 

ia 

•19 
2933 JI]| 



9 

12 

BJ 



l* 



! 

.78 * 

12.63 111 



D F 

500 » 

4 I 

154 liB 



d 
10 



I 

Li 



09 II 

Sioi 



Ic 1 ' 



5576. 



1 25 
2 

120 

.15 

16.20 



50 

] 

276 

.16 



2.->0 

4 

160 

.17 

24.48 

125 

3 

180 

.18 

29.16 

2000 

10 

24 

.60 

12.96 



500 

6 
90 

.20 
16.20 

200 

G 

144 

.20 

25.92 

3000 

10 

IS 

.79 

10.66 



5578, 



5 .'si 



.-flu. i. 



5C02. 



5606. 



FLASKS, Erlenmeyer, Resistance Grade. 

Capacity, ce - (1 

To take rubber stopper, No q 

Number in original ease 190 

Each $ 0.13 

Per original case 22.23 

FLASKS, Erlenmeyer, Pyrex Glass. 

Capacity, ce 

To take rubber stopper, No 

Number in original case 

Each 

Per original case 39 74 

Capacity, cc |()(l(l 

To take rubber stopper, No 8 

Xuniber in original ease 3g 

Eacn 42 

Per original case 13 60 

FLASKS, Erlenmeyer, Pyrex Glass, with extra wide mouth. 

< 'a 1 ia city, cc 

To take rubber stopper, No 

Number in original ease 

Each 

Per original case 

FLASKS, Erlenmeyer, with Ground Glass Stooper, Resistance Grade. 

Capacity, cc ] o- 

Each 45 

10% discount in lots of 12. 

FLASK, Acetylization, with ground in condensing tube, for assaying menthol in oil of pepper- 
mint. Capacity, about 150 cc; length of condensing tube, 100 cm. (See United States Phar- 
macopoeia for 1916, page 296) 1.12 

10% discount in lots of 12. 

FLASKS, Assay Beaker Flasks, Resistance Grade, high form, with lip. 

Capacity, cc 126 250 500 

Number in original case 140 160 90 

Each 18 .24 .28 

Per original case 22.68 34.56 22.68 

FLASK, Cassia, with ground glass stopper, as used in the official U. S. P. method, for assaying 
< i 11 11:1 111 ie. aldehyde. Total capacity, about 200 ce; neck graduated to 10 cc in \' h , ee divisions. 
( Si-c United States Pharmacopoeia for 1916, page 289) 2.00 

235 



1000 

8 

50 

.29 

13.05 

250 

.". 

132 

.22 

26.13 

4000 

10 

12 

1.00 

10.80 

250 

8 

132 

.22 
26.13 

250 

.67 



2000 

9 

20 

.40 

7.20 

500 

6 

72 

.29 
18.79 

10 

6 

1.60 

8.64 

.-,(.«) 

10 

60 

.29 

15.66 

500 
.90 





















I 









FLASKS 



CENTRAL SCIENTIFIC CO., CHICAGO, CM 




■ -. 








No. :»608. 



No. 5616. 





No. 5621. 









No. 5622. No. 5624. No. 5632. No. 5634. 

5608. FLASKS, Copper, heavy, polished, with ring neck, Capacity, c< 500 1000 

Each ' $2.50 3.00 

FLASKS, Dewar, see Vacuum Tubes. 

5616 FLASKS, Distilling, Resistance Grade, with side tub* in middle of neck. 

« Opacity cc 125 250 oOO 1000 

To take rubber stopper, No 3 3 5 5 

Number in original <;i-<' 40 40 30 20 

Each 0.33 .40 .47 .79 

Pei original case 11.88 14.40 12.69 14.22 

5618. FLASKS, Distilling, Pyrex Glass, wit 1. side tube in middle of neck. 

Capacity, cc 50 125 25Q 

To take rubber stopper, No 1 :' 3 

Number in original case 48 U 

Each ; .45 .55 .66 

Per original case 21.60 21.60 12.96 

Capacity, cc -,,„i \ my] 2000 3000 

To take rubbei stopper, No 4 S 9 10 

Number in original case •>] u 6 6 

5 ach ..'.'.'.'.'.'.'.'.'.'.'.'.'.'.'. .77 1.30 1.75 2.35 

Per original case 13 23 1274 8 64 11.61 

llli S"tS2' S iS ^v ng ' £ arrett ' Pyrex Gl2LSS > for"distillationo£*ben Z ol,ca,.aeitv •_• -c 70 

....JJ. FLASKS, Distilling, Claissen, Pyrex Glass, for organic distillations. 

Capacity, cc l25 250 500 1000 

5624. FLABF 5 ~^'''---'-^ 1-60 1-80 2.20 3.00 

oils, 

and 

of gi 

! pawiy, re 250 

To take rubber stopper, No V 2 2 

Number in original ease.. -, f s 48 

Each ' 4 ' 7 q 

Per original case. ..'.'...'.'."" -*° a oa n | 30 - 24 

" ;; "- ^^'^^f^T^^^^ '&'&&*&'* creosote, (ta "cireular 11* 

5634 FLASKS DLsii linl wl°ii %*2 De^tment of Agriculture.) Capacity, 5 -, Ug 

230 




+m w— 



^^x***i 



CENTBAL SCIENTIFIC CO., Chicago, u. s. a. 



FLASKS 








• •» . 




C.3.C0. 



No. 5636. 



No. 5646. 



No. 5650 





No. 5656 




No. 5658. 





K 




C.5.CO. 




5636. 
5646. 



5650. 



5656. 
5658. 

5664. 






5670. 



No. 5664. No. 5666. No. 5670. 

FLASKS, Distilling, Ladenburg, Pyrex Glass, with three bulbs in neck. Capacity, ",00 cc $1.20 
Note: — Other types of distilling flasks will be made to specifications. 

FLASKS, Extraction, Resistance Grade, flat bottom, with wide mouth and vial neck. 

Capacity, cc .. 100 150 250 

To take rubber stopper, No 6 7 s 

Number in original case 120 100 160 

Each 18 .20 .22 

10' r discount in lots of 12. 

FLASKS, Extraction, Pyrex Glass, flat bottom, with wide mouth and vial neck. 

Capacity,©* 50 100 150 250 500 750 

To take rubber stopper, No 6 6 7 8 10 10 

Number in original case 168 120 108 120 60 48 

Each 16 .18 .19 .20 .29 .36 

Per original case 24.19 19.44 18.46 21.60 15.66 15 55 

FLASKS, Extraction, Knorr's, as modified by Walter and Goodrich, with two holes in neck for 
return How of ether. Capacity, 100 cc 60 

FLASKS, Extraction, Sy's Form, with trough for mercury seal and with holes in neck for return 

of ether. Capacity, 100 CC 60 

For other EXTRACTION FLASKS, see N08. "-209 and 5228. 

FLASKS, Filtering, Resistance Grade, Erlenmeyer form, of heavy glass, with side neck. 

Capacity, cc 850 500 1000 2000 

To take rubber stopper, No 4 7 8 

Number in original case 60 in 20 20 

Each 55 .63 .96 1.60 

Per original case 29.70 22.68 17.28 28.80 

FLASKS. Filtering, same as No. 5664, with glass stop-cock on side neck. 

Capacity, ce 500 1000 

Each . ; 2.25 3.75 

lO'v? discount in lots of 12. 

FLASKS, Filtering, Pyrex Glass, Erlenmeyer form, with aide neck. 

( apacity, ce 250 500 1000 2000 4000 

To take rubber stopper, No '' '' 7 9 

Xu1nberi110riginalca.se : " ; 60 - 4 ir ' 6 

Each 70 .95 1.45 2.40 4.00 

Per original ease! '.'/..'. .. 60 - 48 51 - 30 31 - 32 22A0 2160 

FLASKS, Gas Generating, see Gas Generators. 

237 
















FLASKS 



CENTK 



AL BOIBHTIFIC Oa, CHICAGO^ U. tL A 








I 




No. 5674. 



No. 5682. 



No. 5686. 



No. 5b9u. 



No. 5728. 




5074. 



-iHSli. 



568G. 

r.f.'.Hi. 



5098. 
5704. 

5728. 
5732. 




No. 5698, 



No. 5704. 



No. 5732. 



FLASKS, for Iodine Number Determination of Oils, Resistance Grade. Erlenmeyer form, with 
flaring lip ami hollow stoppei ground deep in neck to form reservoir. 

Capacity, cc 125 

Each $o.60 

FLASKS, Kjeldahl, Pyrex Glass, with long neck and round bottom. 

Capacity, cc ;:nn 

Tn take rubbei stopper, No g 

Total length, nun 

Number in original case go 



Each 



.28 



850 


."1 10 


.80 


1.00 


500 


800 


6 


7 




369 


36 


36 


.37 


.45 


11.98 


14.58 



Per original case 15 12 

FLASK, Kjeldahi. Copper, heavy, with H;.t hmt. -m. Diameter, J inches: height, 8% inches 
pacity, L0O0 •-<• " 4.50 

FLASKS, Low's, for Copper Determinations. Pyrex Glass, improved form, with flaring neck. 

SS^f 1 ** cc :•••■•, 180 250 

(Number in original ease 144 ins 

To take rubber atopper. No t, 

^ch :::::::::::::: * .30 

Per original case ; ; ; ; ; ; ; ; ;;;;;; ;;;;;;;;;;;;; ; 32.40 29.16 

F ^5 f 1 , ^ 6 ' of Pyrex . Glas . s - •'" »se in official Brown-Duvel Moisture Testei for detenu* 

Unit is £2 '"uTT , :'i' ;H ! t ^. 1 """ '"•• CSec Circular No. 72, Bureau of Plant [ndustry, 
united states Department «.t Agriculture.) 1.50 

^StaJIIfS-^Src ' l, " , ! ,lr W:,1K , '" 1 ,,s " iM Brown ^ Moisture TesteVVf or detenaiaiag 

5 ..■ . ' . Ste d r m,,1 " s - Ca Pa«ty of the inner vessel, :. ,-. See Bulletin No. 

n "' . 1 B " ,,au " f p,a,,t kdnstry, United States Department of Agriculture) 9-00 

in^ck Ca^^25?c^.^.^T e ^ r ^ "^ """'""^ ** l °° " ]vU " "TiS 
"^SW5^^ S«& ' 'conajete :.'■• an Erienm fe* -th 

Plant I^JyUaited Julii D^ 

238 



A * 






*c 



CENTRAL SC IENTIFIC CO., CHICAGO, U. S. A. 






No. 5736. 



No. 5742, 




No. 5762. 




FLASKS 




No. 5764. 



No. 5766. 



■;-. 












No. 5768. 



No. 5771. 



No. 5772 



No. 5780. 





No. 9757. 



No. 9761. No. 5788A. 



OE't " '. !L 



• 



VIM ■ 



. ' 






■ -i ■■■:■: 












raltt' 

111' 11 "* 





57Mo. PLASK, Sulphur, Pyrex glass, Bat bottom, with side neck heat at right angle, as used in deter- 
mining sulphur in iron and steel. Capacity, 2:>0 a-; neck takes a No. ." rubber Btopper. Num- 
ber m original ease, 40 Each $0.75 

Per original case 27.00 

5742. FLASK, Sulphur. Johnson's, Pyrex glass, with heavy ring neck taking a No. rubber stopper. 

I Capacity t" base of neck, 275 cc. Number in original ease, 108 Each .32 

Per original case 31.10 
FLASKS, Vacuum, see Vacuum Tubes. 

9757. FLASEL, Viscosimeter, for use with Kngler viscosimeter, graduated to contain 200 cc of oil at 
20° C. With government certificate 3,75 

m SMB. FLASK, Viscosimeter, same as No. 97o7, but without certificate 70 

9761. FLASK, Viscosimeter, Pyrex, for use with Saybolt viscosimeter, graduated to contain 60 cc of 
oil at 20° C 1.25 

5788A. FLASK, Viscosimeter, tor use with Ubbelob.de viscosimeter, graduated to contain 100 cc of 
kerosene or gasoline at 20° C .50 

5762. FLASKS, Volumetric, accurately graduated to contain, without stopper. 

Capacity, cc 10 25 50 100 200 250 500 1000 20<»0 

Each .35 .38 .40 .45 .53 .58 .67 1.00 1.80 

10% discount in lots of 10, 20% discount in lots of 100. 

5764. FLASKS, Volumetric, saute as No. 57oL', but with glass Btopper ground in. 

Capacity, ec 1<) 25 50 100 200 l\->0 500 1000 2000 

Each 58 .60 .62 .78 .85 .90 1.10 1.45 2.25 

10% discount in lots of 10, 20', discount in lots of 100. 

."»7<><i. PLASKS, Volume ric, with #lass stopper and two marks on neck, graduated both to contain and 

deliver. Capacity, cc 10" 850 500 1000 

Each .90 1.10 1.30 1.70 

10% discount in lots of 10, 20% discount in lots of 100. 

~>7ii8. FLASK, Volumetric, Foots Flask, graduated, for determining fatty acid in cottonseed by saponi- 
fication. Capacity of bulb, 250 ec 2.00 

5771. FLASK, Volumetric, Pyrex glass, with wide neck and mark low on neck. I'sed in fertilizer 
laboratories for Phosphoric Acid determination. Capacity, 2."0 cc; number in original ca« . 

108 1.00 

Per original case 97.20 

•"•77:'. FLASK, Volumetric, graduated to deliver 58.3 cc, for determining degree of alk alin ity i» feed 
water fur boilers 10 ° 

57HU. FLASK, Volumetric, Pyrex glass, with wide neck, for determination of insoluble phosphoric 

acid. Capaeitv, L»0() cc; diameter of neek inside, 1% mm; iiumhcr in original ease, 108.. .90 

Per original case 87.48 
J.J9 













FLASKS 



CENTRAL SCIENTIFIC 00., CHICAGO, V. S. A. 



<. > 









3 





No. 5784. 



No. 5786. 



No. 5788. No. 5792. 



No. 5812. 



No. . r )818. 



No. 5820. 



n 





NO. 5846. 



No. 0647C. 



No. 9647C. 
As used in the distillation of inflammable 
liquids of high boiling point. 



5784. 



:.7m;. 
5788. 



5792. 



i 3 1 -'. 



r.sis. 



5820. 



9017. 



FLASKS. Volumetric, Sugar, uitli two marks on neck, without stoppi 

Graduated at, cc * loo Alio 200*880 

Each $0.40 .60 .80 

FLASK, Volumetric, Sugar, Bates' Form, |»e:n *lia|-- with funnel top. Capacity, LOO cc.. .50 
FLASKS, Volumetric, Sugar, Kohlrausch Form, with enlarged mouth, and one mark on Deck. 

No v B 

Graduated at, cc ">0 200 

Each 50 .70 

FLASKS, Volumetric, GUe's Form, glass stoppered, with bulb La Deck and two m Used ex- 

tensively for making normal solutions, as the LOpei cent, extra volume in the bulb may be need 
for checking leaving an exact volume t' 1 " correction. 

Graduated at, cc 500 & 5 l""<nk nun 2 &220Q 

Each 2.00 2.75 4.00 

FLASKS, Volumetric, Precision or Normal, withoul stopper, graduated to meel the requirements 
of the United States Bureau of Standards. 

Graduatedtocontain.ee 50 100 lt.ii r.oo MOO 200Q 

Each 1.30 1.40 1.60 2.20 3.30 4.40 

FLASKS. Volumetric. Precision or Normal, same as No. 5812, bul with glass stopper. 

Graduated to contain, cc 25 50 L00 250 500 i" 2000 

Each 1.60 1.80 2.00 2.40 3.00 4.50 6.00 

FLASKS. Volumetric, Precision or Normal, same as No. 5818, bul standardized bv the United 
states Bur. an uf standards, with control stamp. 
Graduatedtocontain.ee mo -jmi ;.un iouii L'ooo 

^*S h 3.10 4.00 4.60 6.50 8.00 

xLASK HEATER, Ceuco Electric, with regulating rheostat bv means of which the heat may 
Im- intriiMrir.l nr diminished. Because of this feature, peculiar to the Cenco heater, it may be 
substitute,! to advantage for the Bunsen burner in manj Laboratory operations, such as the 
distillation i.t inflammable liquids, ashing of easily, volatile products, digestion and distillation 

in the hirUahl method, extractions, igntti f precipitates, etc. Diameter of opening, 2% 

and 

C P 

110 220 

"£?? HEATER " Electric Water : Bath." see* X-i' UJM.rDeKhoUnskyElectricaUy^Hcated Water 



imhe*; energy consumption, 250 watts. With clamp to fasten on'any Buppori stand, cord an 
separabh plug for attachment to any lamp socket. (For complete description, - 168 



Fit \ nits 
Each 



5846. 



FLASK HE^RS E1 . eCt , rlc t Hot Plat «- "" No. 7.-14 Heater. Combination Electric. 

latum ir0n ' Wlth tobeatM rtrips fastened to sides, and openings forvenfi- 



Diameter, inches 

Each . . . 



4% 

1.00 



5 



FLASK HOLDER, Suberite, see Cork Rings,' \V 3296. 

240 



1.15 



6 

1.30 



7 1 . 
1.50 



1.75 



|,ii., 
2.00 



CENTRAL SCIENTIFIC CO.- CIIU'AiiO, U. S. A. 



FLOUR TESTING 



18. 



'■ " i 110 at] 

I on* uik a tt 

1 

: 
,. a 

i-l twu mirk, 
iitbekilsanai 

II • --I 
oawrttk- 

."40 m 
420 » 

- 
| 

•SO 500 ' I 

SO 160 I 

16-00 ^ 

- 
■ 




No, 654. 



No. 5926. 



No. 10312. 



6906. 



652 



656. 
654. 

826. 



5926. 



10312 



FLOUR TESTING APPARATUS 

BALANCE, Porcelain Pan, for general "««;• *«■«; J"-,,, 4 ,, ;,. tillll llf tllt . s.ale pans which are of 

BALANCE, Baker's Scale same as No «48 tin x I graduated bean, has a range 

nickeled brass, L5 em in < Liameter a . Lo f ahaUni pan t . i* Uedj 

of 10 grams in ',„ gram divisions, an 1 I.. ass « l »J""™» . | 000 U11S . | eB aibUity is .war- 

conveniently fitted int.. a pr^eet.ng lnd do.. I • I > \ . ^sibility 1400 

anteed to be ',„ gram. Aetna! tests sh-.u a u ' g re £ er ^ "ith No 648 Balance. Scoop 

FUNNEL SCOOP and Counterpoise. a.T.irat.'lv a«l.]iistul, t.n um iQQ 

holds approximately one kilogram of ^■^l^'^ii'tj^'^itiii'i'Na 656 Funnel Scoop 
BALANCE, Hour Teat, consisting of No. 648 Balance mm in. 150Q 

apa Counterpoise . . .. - ••• ••• •••••• ■••••• j. ;' |M j ■ | :,; i iut.-Vp't»isr* f.'.r use in weighing flour for 

Weighing Scoops, of aluminum, with large "P*" fl ■ c .,,„„„ -, grams. 

protein tests; size Ii holds approximate^ 1- grama or nou , ^ R 

No \, 10 30 

Capacity, about, cc 1.50 1.80 

BALANCE WEIGHTS for' Flour' Testing, "^ ™^' * 

^bo^^id^ppIratus: ttSts&Z Ra». - ■— *■*■■ carbon Diox - 

COLOR^^E^^B^^nd Flour ^e^^^j^ 
EXTRACTION APPARATUS, see general ^f^^con^Jrs. m , 
FLOUR CONTAINER, of B^^^"^ Sghlypolished and tapered to a thin flat edge. 
FLOUR SLICK, of finest quality spun- steel, n »8"»y 1 70 

PDBNACE? Adta*** jge™*jl kKKSfl ] mBtS&tol the determination of the Hydrogen 

. HYDROGEN ION CONCENTRATION ^ffV^, lvincr the influence of aging, Improving, 
Ion concentration (pH) in flour •«•»»"" Vo the dough of any wheat flour there exiata 
bleaching and blending on the baking : a "' .[/.,„.,, the production «,f bread from thia flour 
an optimum concentration of hydrogen ions t i im t 1 N „ 10312 150.00 

will be most Buccesaful. Pot complete deacription wflw ^ "Infl«.-,.. o 

(See Journal of the American Ass—nuon t Cj re aM „ b H> Jesse n-Han S en.) 

the Concentration of Hydrogen Ions on th, Baking v<u 

241 



C 
125 

2.00 






FLOUR TESTING 



I i:\Tii.\l. SCIENTIFH 00., I fflCAOO. U. S. A 





No. 5930. 




No. 5962, 




NO. 5938. 





No jdHB. 




No. 1814. 



r 




No. 5933. 



No. 5960. 



No. 5970. 



:.!t;:i. 








C 


2 


30 




5Q 


4.25 


5.00 



5932. 



.vj:;:;. 



5938. 



5960. 



JARS. Chidlow Expansion, for t<-stiii£ tin- rising qualities of dough. 

N " A 

1 ipacitj . ci ii 

Graduated in, cc 

Each ...".."...'.'.'.'.'.".*. $3.35 

JAR. Chidlow Gas Collection, ff r:i.lu:.t...l t.. ISm ,-,. ,:, 20 ,, divisions Complete with accessor* 
bottles, tubing and rubber stoppers 112 5 

JAR. Chidlow Gas Collection, the graduat 1 jar only of No. ."mil 1 g o 

JARS. Proofing and Dough Mixing. Bee Jars. Stoneware. 

KNIFE f,,r mixing dough. Substantially made, with ebony handle and heavy hand forged steel 

Dla<k* l» lurlu's lolly . ' Qft 

**■' ■ • • • I ..■• .oU 

MAGNIFIERS for examining flour, bolting cloth, etc., see general heading Magnifiers. 
MILLS for grinding wheal samples, see Crushing and Grinding Apparatus. 
MOISTURE TESTERS lor Flour, sec No. 7360, etc. 

m A?p aSul. DETERMINATIONAPPARATUS - ™ l^eral heading Nitrogen Determination 

OVENS. Raking, see general heading Ovens. 

PANS. Baking, sanitary, rounded corners and bottoms. 



5962. 

3844B 

1814. 

3970. 



A 
8%x4% 
7%x3% 

••» 
.25 
2.70 



B 
9%x5% 

8%x4Vi 
3 

.30 
3.20 



Top inside, inches .'.'.'.'. 

Bottom inside, inches 

Depth, inches.. . . 

Each 

Per dozen . . 

_.. 

PANS. Baking, laboratory tvne Dpnth w s.. •. 

"- * «i '«»«« ai top, %. ii,,.,,' T^u^clz 1 :!'. ;:. '::<:: ■? * *?.js+" mt 3i 

POKCBLAIK BOWL ta 1IN . „ g o^^^^Z"" 

POKC ELAIN OOP. „„„,, „ S1 , „, g J d ^ 



00 

TOffl 

.20 
.40 

.30 



242 








5978. 
5979. 



CENTRAL SCIENTIFIC CO., CHICAGO, I & A. 



FLOUR TESTING 




Nos. 5978-9. 




Length, inches ••''■'•-'-•'."!"'"!"*'"! ±g 

Number of doors. . , 

l 0T1 ™ v T :::::::::::::::::::::::::::::::::: ^oo 

FOr220voltS 58.00 



524 

60 

3 

75.00 

75.00 



I 



;-,!,S L . 



. 5988 



:.!»v.» 




No. 5982. 

PROOFING CABINETS for Test Baking. Despatch Electric, of polished steel, with triads observa- 
tion doors and Despatch open Wire Heaters for one beat. Tin- walla are lined with asbestos 
board. Length, 29 inches; depth, ll indies; height, 1" inches; power consumption, 200 watts. 
' implete with Bnap switch and fused entrance switch. No A B 

I" 1 " VOltS 1111 L'L'n 

Each 30.00 30.00 

PROTEIN DETERMINATION APPARATUS, see general heading Nitrogen Determination Ap- 
paratus. 

SAMPLE MAILING CASES, of heavy cardboard with tin bottom and tin screw top. Thickly 
ated within with paraffine, with paraffined cardboard cap for top, so that the tube is air 

tight. Will nr.t lose or take on moisture in transit. 2 inches in diameter by 5 inches long. 

Shipping labels included per 100 9.00 

SAMPLE MAILING CASES, same as No. 5938, but 1", inches in diameter and 7% inches lung, 

will take a 4 oz. oil sample bottle each .12 

10', discount in lots of 12, 20', discount in lots of 144. 

243 



FLOUR TESTING 



ckvi-KAI. SCIENTIFIC CO., CH1CAOO, P. B> A 




CENTRAL SCIENTIFIC CO 



No. 12096. 



No. 12098. 









No. 13514. 



No. 12580. 



No. 6026. 










12096. 

12« ins. 






12580. 

13514. 

6020. 
6026. 



No. 6020. 

SCOOPS for Flour, see general heading Scoops. 
SIEVES for Flour. Bee general heading Sieves. 

SIEVE FRAME, without bottom, but with brass ring for holding bolting cloth. S inches in iliam- 
eter $U0 

Bolting Cloth. Silk, for making sieves, etc. Tin- well known Anchor Brand, Standard weight, 
lo inches wide. 

£'\ : - 2 5 7 9 11 13 IS 

M.sii per linear inch 50 64 B0 111 130 H* 

Per linear foot 2 .10 2.30 2 50 3.00 3.50 4.00 4.50 

SLICKS, Flour, see No. 5926. 

SPATULA, Steel, special 4 inch blade, with wooden handle, dee 1 particularly for mixing a 

small dough .all for gluten and absorption tests . .45 

For other SPATULAS, see general heading Spatuias. 

thermometer Bake Oven, of glass with 5 inch flanged metal scale with white rilled figures, 
mounted on round disk metal base with asbestos mat attached. Range LOO to 6 10 P... 2.00 

TONGS. Cylinder, for use with No. 5906 Baking Cylinder. Length, 2d inches, with special 
•i a " * , 2.00 




40.00 






244 






1 



I 





■ 



11 

IK » 
3iO l* 



irk ftf 



t DM* 

■ 






•: 



od i a 



CENTRAL SCIENTIFIC CO, CHICAGO, U. S. A. 



FORCEPS 





NO. 838. 




No. 6070. 



NO. 840. 





No. 1486. 



IS 



No. 6074-. 





No. 6060. 




No. 6062. 



No. 6080. 



V 




No. 6082 



«<- 





No. 6086. 




No. 6090, 




No. 6068. 



No. 6092. 



6036. 
6040. 
F2853 



F28."»4 



838. 

840. 

1486. 

6058. 



6060. 
6062. 
60615. 
6068. 





6070. 


h ffhi' 


6074. 




9182. 



FOIL, Aluminum Leaf, for electroscopes, etc.; in books of 25 loaves, r>\') inches, Per book $0.25 

FOIL, Gold Leaf (pure), for electroscopes, etc.; in books of 25 leaves, 4x4 inches. Per book 1.30 

.FOIL, Tin, ]>ure, for condenser coatings. Thickness, 0,0005 inch. One pound equals about 50 

square feet Per sq. ft .05 

Per lb. 1.50 

.FOIL, Tin, pure, for condenser coatings. Thickness, 0.0015 inch. One pound equate about Ifi 

square feet Per sq. ft .10 

Per lb. 1.50 

FOLIN APPARATUS, see Ammonia Absorption Apparatus; Urine Analysis Apparatus. 
FORCEPS, Brass, ivory tipped, curved points, for handling weights. Length, about 95 nun 1.00 

FORCEPS, Brass, curved points, plain. Length, about 95 mm 25 

FORCEPS, Blowpipe, nickel-plated with platinum tips. Length, 5Vj inches. Price dependent 

upon market price of platinum. 
FORCEPS, Bottle, nickel-plated, extra length, for removing articles from bottles or jars. With 

corrugated points aud handles. Length, mm 220 250 

Each 1.40 1.50 

FORCEPS, Cover-Glass, thin bent blades, file back, nickel-plated. Length, 105 mm 90 

FORCEPS, Cover-Glass, with straight blades ground thin and guide pin. Length, 115 mm .70 
FORCEPS, Cover-Glass, Cornet's, self-closing, of spring brass, nickel-plated. Length, 115 mm .40 
FORCEPS, Cover-Glass, Kalteyer's, of spring brass wire, nickel-plated, for staining on cover- 

_ glass. Length, K»0 mm 46 

FORCEPS, Cover-Glass, Novy's, of steel nickel-plated, with corrugated handles, with one blade 

fiat, the other curved and pointed. With guide pin. Length, 1 15 mm 1 00 

FORCEPS, Cover-Glass, Stewart's original form, of steel wire, nickel-plated. Length, 115 
mm .25 



6080. 
6082. 
6086. 

6090. 

6092. 



FORCEPS, 
FORCEPS, 

bacteria 

FORCEPS, 
FORCEPS, 
FORCEPS, 

125 nun. 
FORCEPS, 



nun 



Dissecting, see Dissecting Instruments. 

Frost's, as used for handling the slides in Frost's Little Plate Method of counting 

in milk. (For illustration, see page 348.) 2.00 

Pinning, bent blades, corrugated points and handles. Length, 110 mm 1.40 

Pinning, Blake Form, for heavy work. Length, 125 mm 1.00 

Platinum Tipped, for general laboratory work, with corrugated handles. Length, 

Price dependent upon market price of platinum about 12.50 

Slide, Kirkbride's, for staining on slide, of steel wire, nickel-plated. Length, 120 

10 



FORCEPS, Steel, heavy, for general laboratorv work. Length, inches 5 6 

Each " 10 .15 

Note:— 10'tf discount in lots of 12, 20% discount in lots of 144 from list prices of Nos. 6058 
to G092. 

245 



W 



FUNNELS 



, | N ,i;AI. SCJi:.NTll 1« CO., iWU'MiO, U. 8. A. 





No. 6100. 



No. 6102. 







No. 6106, 







No. 6110. 






No. 6124 



No. 6126, 












6100. 



6102, 



61 1 Mi. 



61U). 



611*2. 



6124. 



FUNNELS, ALL KINDS 



6126. 



FUNNELS. Agateware. 

No 

< iapacity, pints . . . 
Diameter, inches 
Each 



B 


c 


D 


E 


1 


9 


4 


8 


VA 


5% 


7i(. 


9 


.45 


.50 


.60 


.80 



TUNNEL, Agateware, for pouring chomica] salt- into iarfi and w ide month bottles. Size, S 
inches by 4% inches m 30 

TUNNELS. Alnndiini Conical Filters, see Filtering Cones, Alundum. 

FUNNEL. Creosote, with stem graduated to 12 m in Mo <* divisions, t atine moisture 

id creosoted wrood (See BulU-nn 134 of the Foresl Service, United States Department of 

Agriculture) jqq 

FUNNELS, Glass, with angle of 60 , with stem ground to a point. 

Diameter, mm 50 65 75 90 ]in» \ . 15 



Length of stem, nun 60 

Capa< ity, about, cc 30 

Number in original case.. L20 
Each 23 



(,., 


1 .i 


•hi 


IO0 


1 25 


IS 


_'<'U 


250 


MO 


65 


7.-, 


90 


K»0 


1 25 


150 


1 


150 


150 


(,11 


90 


L20 


250 


360 


650 


18' 


•11 


.-000 


,n 


LOO 


BO 


60 


10 




30 


in 


10 


.27 


.31 


.36 


.40 


.53 


.67 


1.05 


2.00 


2.65 



10'; discount in lots of 12. 20', discount in original cases. 

FUNNELS Glass. Bunsen with angle uf 60°, for analytical nitrations, with ground rim and 
long Blender sterna ground to a point. Length of stem, about 150 nun. 

JMaiiirirr nun ......... «,i -.. .«- -- A a iaa 



Number in original case .... oin 

Ea * ...::::::::::::::: « 



120 

.27 .34 
10'; discount in lots of 12. 20', discount in original cases 

FUNNELS. Glass Filter, so-called Carbon Filters, for use with Q h crucibles. 

Diameter at top inside, nun 

For (ox. c)i <-ru.il.le, \,, 

Each 



10(1 

-38 



Ml 

.42 



60 
.50 



85 

2 



10% discount in lots of 12 
FUNNELS. Glass. Ribbed, for rapid 
Dia 

Car 

EaCh 23 .30 .40 

10^ discount in lots of 12. 



.25 



B 

30 
3 

.26 



C 

3S 

4 

.30 



EK^aJf** fW ,:,, ":i ,i,U,,5,, fV ,,f ^2 "»« glSS, With Smooth ita. 

|apacit y ; cancel :::::::::: "i 4 | 5 * 7 .:- 1 ** >";■ 

lach J * J* - gala- % 1 

23 - 30 -40 .60 .90 1.60 



13 
g 

2.80 



240 



_■ 



»4JL '"" I 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 



FUNNELS 





No. 6145. 




No. 6147. 




'/ 




•J.\ 



1 



Nos. 6132-4. 



No. 6152. 




No. 6164. 



No. 6166. 



No. 6160. No. 6162. 

M3a "S^fM^ "' h ™> •*** »«*•'■ ■-* «■>«>. u it „ ,,.,„,,„,,„. inn ^ 

euri - ™s » s::r et ' s ' »£ ""•-'"- * : - ™- - - — *. «- 



s. 
00 
5.00 



NO A 

Diameter, outside, mm. 48 

Diameter, inside, nun 42 

Diameter, perforated area, mm '.'. 28 

Distance, rim to perforated plate, mm 17 

Height over all, mm 76 

Length of tube, mm 46 

Diameter of tube, mm 14 



Each 



.HO 



B 

66 
60 
45 

27 
100 

•30 
8 
1.08 



C 

82 

75 

60 

37 

140 

70 

9 

1.80 



D 

102 
95 

si. 

46 
165 

80 
12 

2.34 



E 
122 

115 

KM) 
57 

lo:, 

90 
14 
2.52 



F 

138 
130 
115 

61 
215 
L00 

16 
4.32 



G 

163 

158 

140 

234 

llo 

IS 

5.04 



H 

200 
190 
175 
75 
280 
130 
20 
6.48 



10?/, discount to commercial institutions, 15% discount to educational institution for ordei 
c , .- t-ttxtxtt.to ~ amounting to 8100.00 or above. 

^!3^fowte?^te^ ,,C ^ ,8, g ' aZt "' thr ° Ugh ' Ut Wi,h exce P tion "'" '""• " ith ■«* ■'• »*** a"d 

No .....;.... 

Diameter top, mm .......!..".."... 

Diameter perforated area, mm 

Distance rim to perforated plate, mm 

Height over all, mm 

Length of tube, mm 

Diameter of tube 



Eacb 



A 
54 
16 
26 
66 
:<4 

12 

.72 



B 

28 

12 
CI 
30 
10 

.72 



C 

75 

28 

18 
95 

41 
10 
.90 



D 
92 
28 
33 

121 
52 
12 

1.08 



E 

103 

28 

41 

131 

56 

14 

1.44 



10 % discount to commercial institutions, 15% discount to educational institutions for orders 
fi 1( -o -p TTXrKTT , T amounting to $100.00 or above. 

01D-. ±UWNELS, Hard Rubber, polished, with corrugated spout to allow escape of air. 

K* •;••'.••• ABC 

Diameter, inches 314 414 5 

Capacity, ounces 4 g ]g 

Each ........'.'.'.'.'. .55 .85 1.10 

6160. JUNNELS, Separatory. cylindrical, open top. with glass stop-cock and long stem. 

N .°- •:; B C 

( apacity, ce 60 125 

Eac h 1.00 1.35 

10 r % discount in lots of 12. 
0162. FUNNELS. Separatory. cylindrical, same as No. 6160, but with ground in glass stopper. 

Capacity, ec 60 125 

Each 1.10 1.40 

10% discount in lots of 12. 
6164. FUNNELS. Separatory. cylindrical, same as X... 61 6j. but graduated in ce. 

Capacity, cc 125 

Each 2.10 

10% discount in lots of 12. 

6166. FUNNELS, Separatory, funnel shape, 60° angle, of heavy glass, with glass atop-eock. 

1 'iameter, mm 100 150 

Capacitv, about, cc 250 650 

Each 2.70 3.50 

1071 discount in lots of 12. 
247 



D 
6 

24 
1.20 

D 

250 

1.55 



250 
2.00 



250 
3.35 



200 
1800 
4.00 



H 






































FUNNELS 



CENTRA!. BCIBNTIPIC 00-, CHICAQO, V. B. A 







No. 6168. 



No. 6170. 



No. 6172. 



No. 6174 



No. 6176. 



No. 6180. 



V 



O 



c 



I 








No. 6192A. 



No. 6194 



No. 6196. 



No. 6198. 



No. 6200. 



uir.s 



017". 



017.'. 



2 10 



500 

2 60 



6174. 
6176. 

6180. 

6192A. 

0194. 



FUNNELS. Separatory. globe shape, light glass, with ground glaas stopper, etc ck and li j 

stem. 

Capacity, c< 60 125 250 2 

Each $1.00 1.10 1.35 1.65 200 3.00 5.00 

10' , discount in lots of 12. 

FUNNELS, Separatory. globe shape, of beavj molded glass with glass stopper, stop-cock and 
ahori Btem. 

Capacity, cc 00 101 20 4000 

Each 3.50 450 6.00 835 

FUNNELS, Separatory, Squibb's, peai shape, with ground in glass stoppt 

Capacil y, cc 125 

Each 1.50 

lO'/r discount in lots of 12. 

FUNNEL, Separatory. Straus, for the estimation of lactic acid in jrustri*- juice; with glass stop 

cock. < !apacity about 30 ••<-, wit b marks at 5 cc an-1 25 cc 1-30 

109 ( discount in lots of 12. 

FUNNEL, Separatory. for sulphonation test of creosote, with oed graduated to 5 cc in Hate 
divisions. Capacity, 125 cc See Circular 112 of Forest Service, United States Department 
of Agriculture) 3.00 

FUNNEL. Separatory, Walter's, for dclivorin- -ingle drops. With ground glass stopper and glass 
stop-cock. Capacity, 60 ec 2 oo 

FUNNEL TUBE, conical top, Btraight stem. Length, :$0 cm 15 

FUNNEL TUBES, thistle top, Btraighl stem. 

\ 



No. 



Length, cm 

Each . 



6196. 

6198. 



10% discount in lots of 12, 20'; discount in lots of 144. 
FUNNEL TUBE, thistle top, with bend in stem Poi Bafety trap. Length 10 

10 discount in lots of 12, 20': discount in lots of 144 

FUNNEL TUBES, thistle top, with I,,,, 1 and bulbs. Length, SO cm. 

■ > < > 



.12 



• in 



Number of bulbs 

Each 



v 
l 

.25 



B 

10 
.15 

.20 



B 
2 

.35 



6200. 



10-; discount in lots of 12, 20'; discount in lots of 144. 

FUNNEL TUBE, heavy, short Btemmed, with bend and two bulbs, for use with gas general 

■••*•••■■ t ^ .4!) 

_ 10 ' ' disc °™t in lots of 12, 20' ; discount in lots ' of 144. 

FUNNEL SUPPORTS, see Supports. 



L'4S 









6210. 
6211. 

6212. 



N . 
oO MO 






6213. 

6214. 


. 




• 




jUsrt»fHj 




- 


621$. 
62 If). 


i 1 ,-m 


6220. 



6221. 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



FURNACES 




No. 6210. 




No. 6218. 



FURNACES, ALL KINDS 

FURNACES, COMBUSTION, ELECTRICALLY HEATED 




Resistance wire is furnished in the proper length in spiral coils ready to be wouu.l in the 
grooves uj.nn the refractory tube. The entire renewal requires but a tW minutes time ami 
tan be made it necessary while the tuba is hot A rheostat should be usd to control the 
temperature within safe working limits. The furnace operates on either A. C. or I) ('. with a 
maximum consumption of 550 watts. Widely used for determiuing carbon in ir„n and steel 
by the combustion method of Vanier, Johnson and others. With connecting cord and plug. 
No A B 

{L or vnlts • ■ '.'.'.'.'.'.'.'.'.'.'. 110 220 

Furnace only S26 00 26 00 

Furnace with rheostat 37.00 37.00 

Rheostats for use with No. 6210 to control temperatures within safe working limits. 

£°- ••• \ B 

F <,r volts no 220 

Total resistance, ohms ]n 49 

Eacn 11.00 11.00 

Repair Parts for Furnace No. 6210. 

Refractory Tube only, without wire 5.50 

Chromel Wire for rewinding. 

No A B 

For volts 110 220 

Each 2.75 2.75 

FURNACES, Combustion, Hoskins Electric, Type FB, for use at temperatures up to a maxi- 
mum of 11Q0°C, for continuous operation. The heating element is a spiral of heavy Chromel 
wirr, which radiates heat directly upon the combustion tube, enabling the furnace to he 
brought from cold to 1100°C. in only 30 minutes. As these furnaces operate on low voltages, 
they are best adapted for use on alternating currents in connection with a transformer. The 
temperature should be kept within the safe working limits by means of a rheostat. The ele- 
ment can be readily removed and replaced by the user in a few minutes in ease of a burn out 
Maximum power consumption, 1000 watts. Length of furnace, 12 inches; inside diameter of 
tube, 1V4 inches. Complete with connecting cord. 

No A B 

For volts 110 220 

Furnace only 28.00 28.00 

Furnace with rheostat and transformer for 60 cycles 67.50 67.50 

Rheostats for use with Xn. 6218. 

No A B 

For volts 110 220 

Each 12.50 12.50 

Heating Elements for No. 6218. 

No A B 

For volts 110 220 

Each 4.00 4.00 

Note: The use of a Pyrometer with the above furnaces is desirable, as it will enable the opera- 
tor to know at all times the exact temperature within the furnace chamber. For description, 
see general heading Pyrometers. 

249 





FURNACES 



, i ,i baL BCn Mirn i 0., -Hi' \'-«». r. 8 










6226 
6227 



622S. 



1VS.U 
6235 



6236, 
6239, 



No. 6246. No. 6234. 

FURNACE. Combustion, Multiple Unit Electric, with tube 1*4x12 inches. The heating element ij 
made up of two unita with Bpiral coils in longitudinal groo\ es, either of \\ bich a asily re- 

|. hu-ed by the usei when burned out Widely used foi carbon determinatii ron and steel 

heal treatment of Bmall rods or tubes, and for Pyrometer calibration. Can be used inter- 
changeably ..n L10 or 220 volts A. C. or D. 0., by means of e selective plug supplied with the 
furnae< - A rheostat should be used to control the temperature within safe working limits. 
Maximum power consumption, 560 watts. Complete with su feet of flexible cord and con- 
necting plug. Beighl ovei all, in inches: shipping weight, 25 pounds 

Furnace only S3000 

furnaces, same as No. 6226, but with rheostat No. 623 

- N '" v B 

J™ p Jl eorta1 X " '.'.'. IA 6233B 

hSu^;:: ,,,, 22 ° 

Heating Units for No. 6226, wound ready foi ua'o '.'. ^'^each I!'!!!) 

Rheostats only of No. 6227 Furnace 

- v « A R 

Each ' '" - J 

I ^tSa?L^?m? M n ltiP / e Unit Electric: H^ged Design, permitting inspection of com!! 

I • .. ■ eabl on i ■",' ",' ****** tl '" B « ' disconnecting the train Operates inter- 

i re ?Cffit safe «S wSL^ ' -,'" '."■ C " Rneos *1* should be used to control the temper 
,If H.r.iT^T hmits - ■**■""■ power consumption, 750 watts. Shipping weight, 

tub?! 1% in,lus k ' "" : '"' '" C6ntOT ' ! "^ inches 5 ■«&. 12 inchesj inside^i. tei of 

Furnace only 

Furnaces, same as »i" «mJ tafc vittpT AMftM'Mtel'^ML ^ 

* ■ ••iii. 

With rl stat No.! * n 

Foi volts 62 19 \ I9B 

Each II" 220 

Heating Units for NoVoMi, wound .,,„ls ,,„ usc 54 " 5 ° h "« 

Rheostats only of No. 6234 Furnace eaC 

No 

Fur VOlt8 A B 

Each 110 220 

Note: Tin- use of a Pyrometer witi,"«i'„ ' . • 120 ° 12,0 ° 

to know at all times the ,' tV furnaces ia desirable, as it wiU enable the operator 

general heading Pyrometers. Iem !» , »ture wrthin the furnace i bamber. For description, - 

250 






■■^^H 

^^^H 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



FURNACES 




No. 6262. 



6246, 



31 



m safetnUj 



I 
1 

1 

1 


»iU4 '. 


6250. 


1 1 

Ul 

law m 

rail. OffflBj 

torts' --''i 

• 


liL'liL'. 







Hi 



lie 



:::• 



6264. 



6265. 

6266. 

62C7, 



f 

tly 
(1 



URNACES Organic Combustion, Multiple Unit Electric, consisting of three sections each o 
which can be moved along the rails tor us, at different points and is operated indep*endenti 
},v means of its swit.-h and rheostat on the base. The upper half of each section canbe aiseu 
independently for inspection without disconnect mg the current. The heath,.' units are in two 
sections either ot which may be easily ami quickly replaced by the operator in case of a burn 
out. A temperature <.t 1000 C. can be reached in 40 minutes and held constant indefinitely bv 
means of the rheostat. Rapid cooling 1S obtained by raising the upper section The life of the 
heating elements is about 1000 hours at temperatures not exceeding 1100°r The trough for 
supporting the combustion tube is of pure nickel supported at the en, Is and is free from con- 

ide 




preceding page.) 

No A 

For volts jlO 

Each '...'.'. $175.00 

Heating Units for No. 6246 (two required for each section). 

- N " A B 

For section small ....-d , 

For 110 volts, each 4.00 4.75 

For 220 volts, each 4.00 4.75 



B 

220 
17500 

C 
large 

5.25 
5.25 



FURNACES, COMBUSTION, GAS HEATED 

FURNACES, Combustion, Glaser's, improved form. Provided with mica plates for watching 
the flame during combustion. The row of burners is movable in a furrow; the burners arc pro- 
vided with stop-cocks with separate long handled key for turning ami with nickel-plated air 
regulators. Complete with top plates of daw 

No A B C D 

Length, in, lies 14% 23 30 37 

Number of burners 10 16 21 26 

Each 54.00 64.00 76.00 35.00 

FURNACES, Combustion, Glaser's. same as No. 0263, but for gasoline gas. 

No ABC 

Number of burners 10 1G 21 

Each 64 00 74.00 86.00 

Extra Top Clays for Nos. 6262 and 6204 each .60 

per dozen 6.00 

Extra Side Clays for Nos. 6262 and 6264 each .20 

per dozen 2.15 

Extra Gutters for Nos. 6262 and 6264 each .12 

per dozen 1.30 
FURNACE. Simple Combustion, see No. 2(»t>«i 

251 









FURNACES 



CENTRAL scii:\Tiri<' 00, CHICAGO, U. 8. A 










No. 6278. 



No. 6283. 






6278 
6279. 



C.-JKII. 




6282. 






6283. 

6284. 
6286. 






FURNACES, CRUCIBLE, ELECTRICALLY HEATED 

FURNACES. Combined Crucible and Muffle, Hoskins Electric. Type FD. with crucible elumtur 
2 inches in diameter by -''■.■ inches deep. Can be beated from room tempi i,, 1 000°C 

:u\ minutes. Temperature should be kept within safe working limits by means of a rheostat! 
Requires no special wiring as furnace may be connected direct!} \« lamp sod tfaxu 
powei consumption, 370 watts. Tin- heating unit is .-asily r. wound bj in , tec of born 

out, as the refractory is spirally grooved, and the resistance win furnished In a spiral coil 
ready to wind in tli«' grooves. The entire rei [aires but a few minutes. Complete with 

connecting cord and plug. Ship] Lag weight. 22 poun u 

No ^ B 

Kor volts ll0 220 

Furnace only S25 . 00 ^ 

Furnace with rheostat 36 00 "ififlft 

Koto;— Larger furnaces of the same type as No, 6278 can be supplied on short notice but are not 
carried in stock. Send for special bulletin on Electric Furnaces. 

Rheostats, for use with No. 6278, to control the temperature within safe working limit*. 
No ^ -j 

Voltage .....]]] no 220 

Resistance, (.Inns ., * 

Eich ~ lU5 

Chromel Wire only for No, 6278, for rewinding 

££E: ::: ::::::::: : " : :: "•"••.""::::::: A £ 

jQ 1 EA 

TV ™* C * S : 2?!fi*5 . ri ^ dne . r Electri ^.for the determination of 'volatile matter in eoal 




■ials ' 

x " 

V.. Its 

Furnace only ;:.;:;.;;;;;;;;;;;;;;;;;;;;;; 

Rheostat for No. 6283 

Renewal wire for No. 6283 . 

FURNACES, Crucible, Multiple Unit Electric f'nJ i J 

duty. Adapted for melting metals fbTaS ■ tr, ">" ,:,tm *■ U P f " 1000°C., for continuous 
calibrating pyrometers I ! 



A 
110 


B 
220 


50.00 
12.00 


50 00 
12.00 


1.50 


1.50 




olts. 
(Continued on next page.) 

262 



CEX THAL SCIE NTIFIC CO., CHICAGO, U. B. A. 



FURNACES 



- 

Tff Witt:. 

• ,rtt fir 



::■ 
:': 






bum** oJt/7 




6283. 
6289. 
6290. 
6293, 



6309. 



6322. 



6:<L' . 



6328. 



No. 6322. 

FURNACES, Crucible, Multiple Unit Electric— Continued. 

No 

For volts \ 

Diameter inside, inches 

Depth inside, inches 

I'i.iinctor over all, inches 

Height over all. inches 

Rating of current for 110 volts, amperes 

Rating of current for 220 volts, amperes 

Maximum power consumption, watts 

Shipping weight of furnace, lbs 

Shipping weight with rheostat, lbs 

Furnace only 25.00 

Furnace with rheostat No. 6293 35.00 

Heating units wound ready for use, each 2.75 

Rheostat only 10 00 

Note: — The use of a Pyrometer with the above furnaces is desira 
to know at all times the exact temperature within the furnac 
general heading Pyrometers. 




80A 
110 

2% 
2V» 
7-\ 
8>,. 
3.55 

390 
16 
20 



No. 6328. 

80 B 

220 

2% 

2% 

7% 

8'/j 

■ ■ • ■ 

3..-.:. 
780 
L6 
30 
25.00 
37.00 
2.75 
12 00 
l>le, as it \vi 

e chamber. 



84E 

110 

3 

3% 

S% 
11 

5.M 
2.5 

.-.Hi 

25 
29 

37.50 
49.50 

4 00 
12 00 

11 enable th 

Fur desc i i 



84 r 

220 
3 

3 ! i 

8-", 

11 
5.0 
2.5 

550 

25 

29 

37.50 

49.50 

4.00 

12.00 

e operator 
j>t ion, Bee 



FURNACES, CRUCIBLE, FOR GAS 



FURNACE, Crucible, Fletcher's No. 40A, consisting of a crucible pot with lid and blowpipe 

mounted on cast iron base, with injector burner. Operates on :: s inch supply of coal, gasoline 

or satural gas, using a 9A or 10A Foot Blower No. 1374 or 1376. Gas consumption, aoout -l 

cubic feet per hour. Diameter of crucible pot, 4Vk inches; height of crucible pot, 5% inches; 

height of furnace over all, 6% inches; inside dimensions of crucible space: diameter, 2 r jfc 

inches; depth, - >! j inches; capacity of crucible, 1" ounces gold. Complete with one No. 00 clay 

crucible, but without blower $6.75 

FURNACES, Crucible, Fletcher's Perfected Injector. Can be used on coal, gasoline or natural 

gas. Burner is in one casting, preventing nozzle from becoming overheated. Complete with 

one crucible, but without foot blower. 

No - 41 

For crucible, No 1 

Diameter of crucible space inside, inches 3 1 .. 

Heighl of crucible space, inches '•'-_• 

Pool blower required to furnish blast, No 9A 

Each 10.50 

Extra Clay Crucibles for No. 6322. 

Xo 1 

Per dozen .90 

FITRNACE, Fletcher's Crucible and Muffle Combined, for use with coal, gasoline or natural gas, 
from V> or preferably :t j inch supply. Requires Xo. 9B Foot Blower to produce blast. Will take 
No. 3 crucible or No. 6 when cover is reversed, or a muffle 3%x2%x6% inehea Height of fur- 
nace, 11 inches; outside diameter, 9% inches; diameter of crucible space, 6 inches; height of 
crucible space, 6 r j inches; maximum gas consumption, 100 cubic feet per hour. Complete with 
injector burner, No. 3 clay crucible, and muffle 2500 

253 



41A 

3 

4% 

5% 

9B 

13.00 

3 

1.50 



I 






FURNACES 



i ENTBAL SCIENTIFIC CO., CHICAGO, r. s. a 








No. 6S12. 



No. 6350. 









634 2. 

634 ::. 
6341. 
634". 

6346. 













6350. 
6351. 

6355. 






FURNACES, MUFFLE, ELECTRICALLY HEATED 

FURNACES, Muffle, Hoskins Electric. Type FD. with heating element of Chrome] wire wonad in 

spiral g ves .hi :i special refractory muffle, Borrotuided by packing material with high heat 

insulating qualiti< Heating elements can be easilj rewound by user ha | irn-oat 

tli<- wire is furnished in spiral coila of the proper length ready to wind in tin- ^mnv.-s , 
muffle. The entire renewal requires but a few minutes. A rheostat should be used to keep the 
temperature within safe working limits. This furnace i- useful for ash utn.ns i 

tion df [irc-cipitates, incinerations, fusion*, , umliustions, enameling, harden! inneaUng 

small pieces of steel, melting alloys and m< tab, ■ tc. Without rheostat. 



No 201 

Inside dimensions of muffle apace, inches, 3 1 . 

Maximum consumption, watts B50 

Furnace only $60.00 



72.50 
9.00 
4.25 



Furnace and rheostat , 

Muffle only without wire 

Chromel wire for rewinding 
In ordering, kindly specify voltage. 

Rheostats for Xo. 6342, for com. oiling temperature. 

Fur furnace, No 

Each 



202 

00 

75.00 

89.50 

13.50 

7.50 



2( i 

5)4x3*4x12 

Ji 
100 00 

122.00 

19.00 

12.00 



'4 

,..i 
130 00 

168 00 

27.00 

17.50 



l'ii] 
12.50 



202 

14.50 



20 

22.00 



204 

38.00 



In ordering, kindly specify voltage. 

F ^. N ^, S '. w "?' H ° Skin ! EleCtri< T Type FB ' for ********* up to 1100'C. These Eunu 

tier, n 1 " ,2 , ( "" t "" ,,,,ls ,,,ltv ' ; au ' 1 a ! e ****** to operat i low voltages. Theyare 

TemDeratJre " " J 'j, ;, l ' 1 "'';' 1 ;: ,1, " ni; " 1 ^ '"'""* in 'connection with , transformer. 

c7™ of No 202 Fui,^ 111 i a ? Workmg limits must be secu red by means of a rheostat in the 
case oi No. 202 Furnace and by means of a regulating trans! 

T1,, ' f S " l " in,;i "^ '"'• ■**" f..r 110, 220 and 440 volts „„ either6 
quoted upon request in the case of other voltages i^ ^?reoue„J 



transformer in the case of No. 204. 
60 or 25 cycles. Prici s will be 
quencie 



!; ,M,i " dhie^ons of mufflV \^ inched '.'.'. , , 3! . 

Maximum power C0H8ttned watts ' iX5X» 

VaS^SS u ' raiM Operator's ti' i io^r . ,„„„„, ... ;; ;;;;;;■ ■ *2° 



Furnace only 

Furnace with rheostat and transformer, 60 cycles 
In ordering, kindly specify voltage. 

Extra Heating Elements. Hair Pin Tvne 

tor furnace, No 

r of elements 



202 


204 


1x3x0 


7%x5xl2V4 


2750 


6 1 


90 


90 


95.00 


130.00 



187.00 



290.00 



Each 



iiuin-il 



— - — » n 

In ordering, kindly specify voltag< 
Note:— Furnaces of type FB with 1 



» • • • * 



202 
10 

1.30 



204 

10 

3.00 



notu-i-, but an- not 



rger muffle apace than those listed can be furnished ""short 



'arm,! regularly [„ st oc-k. Prices 



quoted upon application 



254 



OENTBAL SCIENTIFIC CO., CHICAGO, U. S. A 



FURNACES 




EAT£D 

... 

- 

■ 

100 00 
1*100 

m 



m 



■ 





. 


1150 


- 




Ttafr 


0« voltlf* 1 




. "■ " 


as of a 


itaftfl 


\htcmi\ 




Pfaf 




:• 










KM 


1U 



IK N 



3tf 



u 



SI 



tion- 



sti 



6.1G2, 
6364, 
6365, 

6363, 



6371 



6372 




No. 6362. 




No. 6372. 




can be operated mterchangoaJ.ly on no an<l 220 v.. its by means of ;. selective plus furnished 
with the equipment A rheostat should be used to keep the temperature within safe working 
limits. The counter-weighted doors are reversible ,,„• hinging ; „ either top or bottom of open- 
ing, and are provided with % inch air tight mica peephole. A % inch pyrometer opening is 
provided in rear head A rear door „f the plug type with vmt hole and handle ran be sup- 
plied n de^nred, at additional charge. Complete with six feet of flexible leads and selective 

plug, :ui.l with metal shelf for holding crucibles, tongs, etc. 

No 50 52 54 

Inside dimensions of muffle space, inches. 3%x2«-.x7 4',x:?xl0 5V4x3^ 4 xl2 

Outside dimensions of furnace, inches... 12y4xloy,xl4 I5xl2%xl6 17xl3%xl8 

Shipping weight, furnace only, lbs (i.". 100 135 

Shipping weight with rheostat, lbs.. 72 107 148 

Rating of current fur 110 volts, amperes. 9.1 1.5.1 18.8 

Rating of current for 220 volts, amperes. 4.~>."i 6.55 9A 

Maximum power consumption, watts 1000 1440 2070 

Kilo watt hours consumed in reaching 

1400°F. (760°C.) from 75°C .5 .72 1.2 

Kilo watt hours consumed in holding 

1400°F. (760°C.) 39 .89 1.37 

Furnace only .365.00 82.50 110.00 

Extra units for top or bottom, each 4.00 5.50 • 8.00 

Extra units for side, each 2.75 3.50 5.50 

FURNACE, same as No. 6362, but with rheostat No. 6371. 

No r.OA 50B VJC 52D 54E 54F 

With rheostat No. 6371 A B C D E F 

For volts 110 L'20 110 220 11" -J20 

Each 77.00 77.00 95.50 95.50 128.00 128 00 

Rheostat only of No. 6362 Furnace. 

No A B C D E F 

For furnace No 50 50 52 ."»2 54 54 

For volts 110 220 110 220 110 220 

Each 12.00 12.00 13.00 13.00 18.00 18.00 

FURNACES, Muffle, Multiple Unit Electric, same as No. 6363, but with rheostat encased in hous- 
ing below furnace body, convenient for use. This position also eliminates unsightly and dan- 
gerous wiring. Complete with six feet of flexible leads ami plug. 

No «iu 82 64 

inside dimensions of muffle space, inches. 3Hx2V;x7 4 1 4x3xlo 5%x3%xl2 

Outside dimensions of furnace, inches. . . 13.\10V 4 xl3 14%xl2%xl6% 16%xl3%xl9 

Shipping weight, lbs.; "" 105 13.") 

Each 82.50 100.00 135.00 

In ordering, kindly state voltage. 
For EXTRA UNITS AND PARTS for No. 6372, see Nos. M364 and 63G5. 

Note:— The use of a Pyrometer with the above furnaces is desirable, as it will enable the op- 
erator to know at ali times the exact temperature within the furnace chamber. For descrip- 
tion, see general heading Pyrometers. 

255 



I 

1 



FURNACES 



i i vn.wi. SCIENTIFIC CO., CHICAOO, 0. B. A. 






r 









s 



trte 



J. 




No. 2146D. 







No. 6398 (shown with 

complete outfit for 

burning gas). 





No. 2] 




No. 6390. (Shown with complete outfit 
for use with gasoline.) 



No. 6410. 



6390, 



FURNACES, MUFFLE, GAS HEATED 

FURNACE, Muffle, Braun's No. 20, for operation with gas ,,, gasoin.e. Mounted on iron legs 
cor eonvenienci in operation. ze of nmtll- spar.-, c,xl2x4 inches. 31 weight, 140 

pounds. Complete with one muffle, hood and two lengths of stove pipe, but without burner, 
supporting table, tank or pump. For gas, Vulcan Non-Blast Burner No. 2146D should be used. 

S33.00 



••::!» s 



FURNACE. Muffle, Cary's No. 33, for gas or gaeoKne, with patent draft inducing attae 
Furnace la so arranged thai Bpecial .-omhusti..., chambers around the muffli distribute t 



.-tin I 
in 



hraent. 
he fire 



a 



"" produce a uniform temperature in all portions of the muffle. Size of muffle, 8x12x5*1 

ches; shipping weight, 250 pounda Complete with one muffle, muffle d i I with special 

or 

ng 
19.00 



...... „.„„...,{ u.im.r, _.,., nounua uomplete with one muffle, muffle .1 I, I with spec! 

MftattoehneBt and two lengths of Btove pipe, but without burner, supporting table 
Mower. B"™ Blast Burner n., 2150 i. recomiilnded for use with t)u> i,,,,,^, v.hn, buna 



2150. 






21461) 



64 1 (I. 




• -- '■«'"•■ - *».Mrj^^^ 






6411. Extra Muffles fW No. 6410 



each 1.65 



2. r ,n 



wm^ 









tmtA M a i 
• ittfal 



niiciflg H 
of Doflr, 



6424. 









■ 










; ::•..""■ 



6425. 
6426. 



CENTBAL SdBKTOlO CO., CHICAGO. U. S. A. 



FURNACES 




No. 6424. (Shown in use.) 



No. 6436. 




No. 6424. (Shown in section.) 

FURNACES, High-Temp Electric, for temperatures from 500° 
iu mac 



to 



£ 3S2K2 £5S V W V" t0 125 vo,, °- * *•*£ -Ek*£?srE!i 

rs who are not equipped with transformers or generato 




6 gfj 



6436. 



• > 



.-■■" 



d 



watts' th! i', T L 0ad °, f .t° ampereS and a maxi '»» m Power consumption of 2.75 kilo- 

fur i4 . i £?♦ wee can be brought to a temperature of 1600° C. in an hour. A switch board i 3 
tho JI« * V0lt " ,CtCr ' amn ^ter, circuit breaker, line switch, and rheostat for controll n e 

er of Tn?ru? anU ; ter °! - h l ated * a 5*a « inchea: tk 'I )th - 3 * ««*-! °«t.ide d am- 

17i r n?h "i %1 4 . %i nch "\ heiBhtoverall » 19 i,uhos - Dimen«ioM of switchboard panel- 

Pie wfthT, ' 6 "^f^V'SrV inC , h thick ' «q«i»»8 ^ i^hes of space for mounting. 1 Com! 

t no f' switchboard, 7 feet of asbestos covered flexible leads, 5 pounds of franular 

resistor material, and instructions for use, but without crucible. b 

No . 

^ h volts ..-.::::::::::::::::::::::::::::::::;:::: hoa.c. hod. a 

Granular Resistor Material" fir N'o.'sm'. .' .' " ! ! ". ! '. ! ! ! 1 1 ! ! '. \ '. \ \ **%£* pound* 210 '!™ 

Special Crucibles for No. 6424, capacity 60 cc ...V ' * P ^S 1 25 

Note:— Price of parts of No. 6424 for replacement furnished on request. 

Note:— The use of a Pyrometer with the above furnace is desirable, as it will enable the od- 
erator to know at all times the exact temperature within the furnace chamber. For descrip- 
tion, see ge neral heading Pyrometers. ^ 

For No. 6428 FURNACE, Electric Axe, see page 532. 

FUSEL OIL APPARATUS, Bromwell, with stop-cock and glass stopper ground in as used bv 
the Association of Oili.ial Agricultural Chemists. Capacity of lower bulb, 20 cc stem K raoV 
a ed from 20 to 22 cc in Uptfi cc divisions. (See Bulletin 107, Bureau of Chem .try United 
States Department of Agriculture) _ 4.50 

257 






GAGES 



otntbal aanwn '.<"" " ,;o - r s A - 






No. 6464 




- 








& 



>■ 



Nos. 6474-5. 



No. 6478. 



No. 6460. 



No. 6466. 




GAGES, ALL KINDS 



GAGES, Altitude, Bftfi Barometers. 
6460. GAGE, Differential (Pitot Tube), as described i. Pree. P. B. Woodworth of It Polyteehaii 
Inst it nt*- :n the 1915 meeting of the C. A. s. \ M. t. Outfit includi Pitot tube of 

correct Bhape and dimensions, and ;• glass manometei tube suitably i at n a v <:il«' 

meter long graduated in both metri rrtema. With this tul rare- 
ments of the flow of gases and liquids may be made, n may also be u a velocity in 
cat(»r on motor boats and in "i" ,fl streams of rater, or in pip r or steam. 
A set of curves is furnish. -.1 with tin- :ii>i>aratua by means of which presi dues may hi 
converted into velocities in units of feet per second oi miles pei hour i or water. 
$12.00 

GAGES, Draft, TJ Tube or siphon form, u it li metal fittings removable braai bend ■ 

union. Scale graduated in '„, inch divisions. 
Length, inches g ,., , „ g| 

Each 6.00 7.00 8.00 14.75 

GAGE. Draft, pocket u-fonn. :u II M,r,,i i«.r ,,,,,,,-, t ,,,,,. vritfa hose connecting piece and adjusl 

valve. With 6-mch scale graduated tn # inch divisions Ii50 

GAGES, Heat, Bee Pyrometers. 



6464. 



6466. 



6474. 



6473. 
6478. 



GAGES, PRESSURE 

G ^u , «^3; BiSS^uS Vr im,m,V ^ Sl,,f:1 " SI ' rin - fo "»- for ■**. *«•■» or water pressure; 
Provil. w -it t , i' 1:,tt '« , /"!»»"»»r. ^- a -««..-i. d&l, range t.. SO pounds per square in* 
proM.ied with stopcock, and nipple for attaching hose 5.00 

GAGE, Pressure. Same as No, «74, but with ran,, t« 10n poun^ '. '.'. ['. " '.'. '.'. '.'. '.'... . 5.00 
f;,;?";^^ S :- l ' a,U "! *•? W A W of extreme aeeur. traduafc meatf 

tv n ' , 7 ! nd t,M,,i , "" K ' r t,u rt •*"«' Extremely * 

lM flbT with aSSTJS 1 ^T"" ' to '"■ ■*■»»■**> correct when shipped. Bange,0ts 

xuo ids., with stopcock, and nipple tor attaching hos,. Entirely of brass, case nuk,l nlated. 
17.00 

GAGE. Pressure, f ., gas , y ,i,uU.rs, s ,,. x os . B «o,' 6 55S ' i,,,',,' ££ 

LT.S 













^TOALMttNTinc CO., CHICAGO, U. S. 



GAGES 




i.6Ct 



NOS. 6480-2. 




No. 6486. 






»> 




No. 6494. 



No. 6496. 



No. 6500. 




No. 6490. 



No. 6504. 



6480. 










6482. 

6480. 
6490. 

6494. 



649(3. 



6499. 
6500. 
6504. 
6506. 



GAGE, Rain, similar to United States Weath r Bureau type, but smaller. A zinc vessel 3 
inches in diameter by 13 inches long, in the top of which is placed a copper cup having an 
open top exactly 3 inches in diameter with sharp edge and projecting rim. The bottom of 
this copper cup is open and fits in the top of a brass tube 1 inch in diameter in which the 
amount of rain is measured. This tube is provided with an overflow opening and a wood 
rule graduated for reading the rainfall directly to Y 100 th of an inch $4.00 

GAGE, Rain, United States Weather Bureau Standard, similar to No. 6480, but 8 inches in 
diameter and 23 inches long, with inner tube of brass. Complete with measuring stick 12.00 

GAGE, Screw Pitch, with 24 pitches, 4 to 30 threads to the inch ; V thread 1.75 

GAGE, Tube, of steel. For measuring the internal diameters of tubing, etc. Scale range, 1 to 
1 ") mm. Graduated to ]/ l0 mm 1.60 

GAGE, Vacuum, or Manometer, for use with air pumps which are provided with a 7/ m 
inch opening tapped with 16 threads to the inch. Enclosed in glass tube with oxidized scale 
14 nil long, graduated in millimeters. Filled with mercury, ready to attach to pump.. 10.00 

GAGE, Vacuum, or Manometer. To be used under any bell jar which is 8 inches or more 
high. Tube is mounted on a base with millimeter scale. Filled with mercury ready for use 2.50 

GAGE, Vacuum, or Manometer, of glass, with stop-cock and movable mirror scale graduated 
iu millimeters for 13 cm above and below the zero line. Mounted on a wood support. 

Without mercury 10.00 

Tilled, ready for use 15.00 

GAGE, Vacuum. Same type and description as No. 6474. Range to 30 inches 5.00 

GAGE, Combination Pressure and Vacuum, combining Nos. 6474 and 6504, showing both pres- 
sure and vacuum on one dial; 3!&-inch dial, in iron case with nickel trimmings 8.00 

259 



GAGES 



I ,-NTRAL s. -iiatii-m. Oft, CHICAGO, P. 8. 



6512. 




Shown 
Mounted on 
Support 
Stand. 



No. 6512. 







No. 6511. 



No. 6511A. 



6511. GAGE. McLeod, Improved Form, with nil class parts completely protected by the wood frame 

and with a unique construction .>i mercurj r< si rvoir permitting rapid readings tn be made. 

The upper portion of the gage consists t .t" lindrica] bulb endll in :i l I ••» j'lllary 

tube, with a hand calibrated scale reading to "' 5 mm. The mercury re» the bottom 

is made in the form of s Long cylinder in which :i « i. n plun fits loosely, the \<>\> of 

which, extending from the cylindrical reservoir, serves as a handle. When the pluagei is 
pushed down, the mercury Level ie Buddenlj raised bj the displa< at, forcing the mercury 
rapidly into the bulb and capillary, Thia featun greal improvemenl over tin usual type 

"i gage, as it reduces materially the time required to take a readij With this instrument 
three readings may be made in one minute, th is permitting i bangei in p to be more 

closely f«diowe.i than with the usual type of gage. 



The glass parts are substantially secured to tin frame and are bo protected bv it as to minimis! 
breakage. The instrument is nicely finished, with polished u iwork and nickeled fittings. 

'^ ll ' IIVI ' r aU j about 60 inches; mnniry required, 7 pounds. Without mercury $52.00 




20.00 



bv lneniw nf c \¥„t„„j A ; ......«..«., i., [„,. mrc, win. n uas i.r.-ii eareruiiv cauoraww 

d re th £ JJriSu ^"'^ * e ? ree ot v; """ m in aundredtha of s millimeter ean be read 
WUhout si^port siand". I' '^ '" *• tt0Ut ° f thc box for — ™ b ohservsti 
GAGES, Wind, see Anemometers 
6514. GAGES, Wire, A 

No 

Sizes 

GALVANOMETERS,' see Electrical Instruments. 

260 



merican standard, of best tempered steel. 



« • • • 



• • • • • • 



• - 



A 


B 


ii to 36 


5 to 36 


3.00 


2.50 



I ■ 



CENTRAL SCIENTI FIC CO., CHICAGO, U. S. 



A. 



GASES 



11 




No. 6530. 



No. 6541. 



No. 6545, 



iA. 

prrff rfewii 

I i nnr rW 

'.-■ .. ■:■ 
• trtkl 

; 
pr 

«4 in a ■*• ' 



,k hw b*« *"* 









* 



A 

in 



GASES COMPRESSED IN CYLINDERS 

We furnish cylinders tested in accordance with the latest regulations of the Interstate Commerce 
Commission. These cylinders are returnable for credit and refilling onlv when all return transporta- 
tion charges are prepaid and only when they have not been used to hold any other gas. The serial 
number of the cylinder must be shown on the Bill of Lading and the green labels attached to cylinder 
must be destroyed before such eylindera are offered empty to the transportation company for return 
to us. Many of the gases formerly listed by us are ordered so infrequently that we no longer stock 
them but refer our customers direct to the manufacturers whose names are given below. 

6527. GAS, Carbon Dioxide (Carbonic Acid), liquefied, in cylinders containing 20 lbs., suitable for use 
in freezing microtomes and for other laboratory purposes. Dimensions of cylinder 6x54 
inches • $2 3.00 

Note: — Cylinder returnable for credit at $15. nil |,. ss rental charge of 1 cent per day after 60 days. 

6530. REGULATOR, Constant Pressure, for carbon dioxide tanks, for delivering carbon dioxide at 

any desired pressure from 5 to 300 pounds. Complete with regulator and gage reading to 
300 pounds in 5-pound divisions 15.75 

6531. GAS, Hydrogen, 99.~>% pure, in 100 cu. ft. cylinders under pressure of 1800 pounds per square 

inch, especially adapted for hydrogen ion concentrations and electrometric titrations. Dimen- 
sions of cylinder, 7 1 / l x38 inches 35.00 

Note: — Cylinder returnable for credit at $30.00 Less rental charge of 23 cents per week after 30 
days. 

6535. GAS, Hydrogen, same as No. 6534 but in 200 cu. ft. cylinders, 0x51 inches 60.00 

Note; — Cylinder returnable for credit at $50.00 less rental charge of 50 cents per week after 
30 days. 

6533. GAS, Nitrous Oxide (''laughing gas"), liquefied, 100 gallons of gas compressed into a steel cyl- 
inder measuring approximately 3%xl4 inches. Suitable for hospital and dental uses.. 13.50 

Note: — Cylinder returnable for credit (no rental charge) at $0.00. 

6539. GAS, Oxygen, 99% pure in 100 cu. ft. cylinders under pressure of 1800 pounds per square inch, 
as used in calorimetrv, steel analysis, carbon combustions, etc. Dimensions of cylinder, 7*4x 

38 inches .' 35.00 

Note:— Cylinder returnable for credit at $30.00 less rental charge of 25 cents per week after 30 
days. 

6541. GAS, Oxygen, same as No. 6539 but in 200 cu. ft. cylinders, 9x51 inches 60.00 

Note:— Cylinder returnable for credit at $50.00 less rental charge of 50 cents per week after 30 
days. 

261 




OASES 



MTRA1, WMKNTinC ro ^HirACSO, IT. H. A 






No. 6649. 



No. 6562. 



6545. GAS 






654*. 



6549. 









6552 



6553 



VS Oxygen, 99.5% pure, compressed into stool cylinders, u m hospitals. Needle Vslvi 

1ft «s«Ti. K .....s \o. 6552-65 annol b< used with these cylinders but the gas can 



B 

130 
x24 

18.50 

13.50 



A 
No , (l 

Capacity, gallons of gas , u ., 

Approximate size of cylinder, inches ' - 1 '' 

Each (including cylinder) ■•■ ton 

Cylinders returnable for credit ( do rental enarge), at j.uu 

WHEEL VALVE AND YOKE foi DM with No-*. ,;: ' ;s :'»"' '' v ' : ' eylind. r>. Tin- wheel art-* as 

the wrench and the yoke- permits attachment ->i rubber tubing 2.00 

NEEDLE VALVE for standard oxygen and hydrogen cylinders. Tins valve will d >os at 

an even, moderate speed and is especially valuable foi combustion work. Bj ita sse it is 
possible 'to count bubbles passing through absorption tram ..r washing solution 5.00 

Note:— The kind and make of gas eylindei must be specified in ordering. 

REGULATOR, Constant Pressure. Hoke-Phoenlx, designed especially for us.' on high pressure 
cylinders of oxygen or hydn.g. n. These regulators are fitted with every device that can add 
to the safety of the user. The safety inlet coupling prevents :i su.hlen rush ..t" tin sntin 
pressure into the regulator. The large gage opens and allows the oxygen to escape ■" case ol 
a rupture, thus preventing an explosion. The safety perforated bonnet will release the oxygen 
quickly if the diaphragm Bhould be ruptured, thus preventing injury t<> the user, rbe lai 

dial indicates how much gas is in the tank, also whether it is full when purchased, ffrhethei 
there is a leak at any time, and when the tank is empty. The small dial shows the delivery 
pressure, which is controlled hy the regulator I'loin 1 to 40 lbs., as desire. 1. Sine, these regu- 
lators deliver at a steady low pressure they are particularly suitable for hydrogen ion deter 
miuations and combustion work. Finished in gilt for oxygen cylinders, with directions 33.00 

REGULATOR. Constant Pressure, same as above but finished In silver for hydrogen cylinders, 

' 33.00 



6559. GAS, Sulphur Dioxide, in cast iron cylinders h tiding about 6 pounds of gas. with valve. Dimen- 
sions, 4x15 inehes 7.50 

Note* — Cylinders not returnable for credit. 

Other Gases 

GAS, Ammonia, may be obtained from the Armour Ammonia Works who maintain branches in 
nearly all large cities. We will furnish name or nearest branch upon application. 

GAS, Chlorine, may be obtained from the Electro-Bleaching Gas Co.. 18 East 41st Street, New 
York City. s 

GAS, Nitrogen, also Liquid Air. may be obtained from the Lands Air Products Co. -who have 
ma^- plants scattered over the country but mike Liquid Air and its bv-product Nitrogen only 
at Elizabeth, N. J., and Cleveland, Ohio. 

262 






CENTRAL SCIENTIFIC CO., CHICAGO, U. S. 



GAS ANALYSIS 



*& . «* 







No. 6594. 








No. 6612. 



U»4e* TWiMi 
I 

Tkia ral 

wtjoa work. B 

•rder::.; 

a «u<ld« rwkrf» 

1 bona'*, will rwMf ' 
to Ikr «k bl 

full wh* poKbJti 

, nail dial *»« * 

• fw ktdnpi*! 



- 



mtlrtl* 






GAS ANALYSIS APPARATUS 

6594. GAS ANALYSIS APPARATUS, U. S. Bureau of Mines Form, for Analysis of Gas Mixtures con- 
taining C0 2 , C.H„ O,, CO, H. f CH,, C..H,,, and N\. Recommended for analysis of illuminating 
gas, oil gas, mine gas, natural gas, flue and furnace gases, exhaust gases from locomotive en- 
gines and automobile motors. Mercury is used in the burette and combustion pipette to facil- 
itate precision of measurement. Complete witn 7 pipettes including slow-combustion pipette; 
water jacketed measuring burette, capacity 100 cc, graduated in Yiq cc; compensating device; 
manifold tube with four stop-cocks; and two leveling bulbs; mounted in wooden case with 
iron supports, but without mercury. (See Bulletin No. 42 of the U. S. Bureau of Mines, 
page 43.) $110.00 

Extra Parts for No. 6594 

6595A. Pipettes, Absorption, with glass tubes each 3.00 

6595B. Pippttes, Bubbling, for CO absorption, with stop-cock each 6.50 

6595C. Pipette, Slow-Combustion, with electrode and stop-cock 5.00 

6593D. Manifold Tube, with four stop-cocks 11-00 

6595E. Burette, capacity 100 cc, graduated in y 10 cc, wi*h two three-way stop-cocks 13.50 

660G. GAS ANALYSIS APPARATUS, Burrell'S, for determining benzene or gasoline vapor in gas 
mixtures by the freezing method. (See Journal of Industrial and Engineering Chemistry, 
Vol. VII, No. 2, for February 1915, page 112; and Technical Paper 87, of the United States 
Bureau of Mines, page 3) 12 " 00 

6612. GAS ANALYSIS APPARATUS, Dwights" CO* Indicator (Patent Applied for), for determining 

the percentage of carbon dioxide in flue gas and other mixtures. The outfit consists of a cast 
metal tank with reservoir in the base holding enough solution for 300 tests The tank is pro- 
vided with special inlet valve with stop-cock, and an aneroid gage reading directly in percent- 
age of COo, in % per cent, divisions. The test is practically instantaneous, requiring only 
1 minute to complete. Complete as described with 6 feet of rubber tubing, pressure bulb and 
sufficient chemical in dry form to make up one charge for the instrument 35-00 

6612A. Chemical for renewal of No. 6612 CO, indicator, in dry form 1** bottle 1.25 

6613. Traveling Case for No. 6612, covered with karatol grain leather, plush lined, with handle and 

nickel-plated trimmings, and with lock and key 

263 




GAS ANALYSIS 



CENTRAL 81 



11; vnri<- " MKJ I s A 





No. 6620. 



No 66JL 




No. 6628. 




No. 6636. 



6620. 



6624. 



6628. 



662!». 



6637. 

6640. 
6641. 
6642. 

6643. 
6644. 
1614. 

<•><;}-. 

6832, 




GAS ANALYSIS APPARATUS. Haldane. Portable Type, for the Determination of Small Quan- 
titles of CO.. in Air. commended bj the American Public Health Association for the anal- 
ysis of •'<> in air in bouses, schools and factories. Th< burette baa :i total capacity of 20 ee 
with stem grailiiati-.i to 0.2 cc in .002 cc divisions, facilitating readings directly in volumes 

l"' r "'• Complete in portable wooden cast See "Methods ol ' knah • by Dr. J. 8. 

Haldane, [920 Edition.) §4550 

GAS ANALYSIS APPARATUS, Haldane. Portable Type, for General Aiialv.-is of Air and Gas 
including O.. CO and CH.. 1 8 ed in physiological testing of aii in houses, scl Is and fac- 
tories and for investigation ol furnace and mine gas. Complete in portable n leo .-aw. 

(See Methods oi Air Analysis.' 1 by Dr. .1 s Baldane, 1020 edit 58.50 

especially 

nifold tube 

Complsts 

37 00 
Extra Manifold Tube for No. 6628, with four'stip^cocka MO 

Wnf 5au2X ^^tT 8, 0rsat - Lu ^ -"1- to No. ei^bur^tt'fourpi^ttesasa 
tube ' ! r , i''^; I 3:m,, '- J , '" r M ' , • ;,^l,, • «&**»* of hydrogen. Completed drying 

tur.i, in portable polished wooden ease ' ' 5Q00 

Extra Manifold Tube fWN., ,-,636, with ,h , st^'cocks ." ." .J.'. [^ i^OO 

au ±.»ra Parts for Orsat Gas Apparatus Nos 66"8 and 8030. 

::: P : ;:s plain - *% w s ** ^ £M f «• "° 

ADborption Pipette, same as No. 6640, but filled with elass tub. 2.50 

A S^ P r- fiUed Wlth g1 ^ tUb - - -pper^ral;":,,,, pe^g" at '££' * « " 

Measuring Burette only, without rat I, ' jacket 500 

Water Jacket only, for measuring burette 80 

Aspirator Bottle, I ouacea «0 

Soft "Rubber Bag for attaching to ninettei 75 

^A !Phte «,, ll ,;^i ( :-- ri; -_ tj(:j; ........ 5 

264 



I 







ANTRAL SCIENTIFI C CO., CHICAGO, U. S. A. 



GAS ANALYSIS 




.V. .-: 



I Dew 




Nos. 6676-7. 



No. 6678. 






No. 6720. 



No. 12900. 



No. 6698. 



6676. 



I 




* 


6677. 


eoenl Awljas of Jir a 1 

1 


6678. 








6698. 


■•" I 




. 1 


6720. 
12900 


1 




I 


6722. 


■ 

1 





GAS ANALYSIS APPARATUS. Williams' Improved, Model A. for the complete analysis of 
combustible gases, with special form of bubbling pipettes designed to increase the rapidity 
of absorption and to decrease the possibility of breakage. Complete with four special bub- 
bling pipettes with stop-eocks, filled with glass tubes, manifold tube, water-jacketed measur- 
ing burette with stop-cock, leveling bottle, three-way stop-cock and aspirator pump, in pol- 
ished oak case lined with rubber. Height. 17% inches; width, 12 inches; depth, 4 
inches $65.00 

Portable Explosion Coil for use with No. 6676 in determining methane. Complete with bat- 
teries in polished oa k case 10.00 

GAS ANALYSIS APPARATUS, Williams* Improved, Model B, for analysis of flue gases, sim- 
ilar in construction to No. 6676, but with three bubbling pipettes for determining C0 2 , CO, 
and C. Complete with three pipettes with stop-cocks and glass tubes, manifold tube, water- 
jacketed burette with stop-cock, leveling bottle, three-way stop-cock and aspirating pump, 
in polished oak case, lined with rubber. Height, 17% inches; width, 9% inches; depth, 4 
inches * 5 - 00 

GAS APPARATUS, Bunsen-Fresenius, for chlorine, see Chlorine Absorption Apparatus. 

GAS APPARATUS, Referees', for Sulphur, complete as illustrated with burner and support, with- 
out flask. Described in Technologic Paper No. 20 and Circular No. 48 of the United Spates 
Bureau of Standards ' 

GAS APPARATUS, Wolpert's, for carbon dioxide in air, see No. 146. 

GAS BAG, Rubber, oval form, without stopcock, capacity one gallon 5.50 

STOP-COCK, Brass, for No. 6720 Gas Bags. One end for attaching rubber tubing, the other ^ 

N xL 11 !.- inch brass tube for nozzle of gas bag 

GAS BAG, Rubber, same as No. 6720, but with brass stop-cock, capacity one gallon. . . . 6.60 

GAS BALLOONS, Glass, see Balloons. 

265 






GAS BURETTES 



, kntjmt Kniamwp QQm chicaoo. v. a a. 




♦ 




No. 6730. No. 6732. No. 6736. 



No. 6740. 



No. 6744 



No. 6750. 



No. 6751 



6730. GAS BURETTE, Bunte's, with two ttop-cnrks, without wnter jacket. Graduated from -10 to 
,"•() vv in i , (1 tli. aii<l from 50 to 100 00 in 1 Bfl dil Lbione $4.50 

6732. GAS BURETTE, Bunte's, same as No. 67:>n. but with water jacket fitted with rubber stop- 
pers 7.50 

6736. GAS BURETTE, Hempel's, without stop-cocks, set in heavy metal bases, with otic plain bu- 

rette, and one burette graduated to 100 ec in >.-, e<- divisions.. 8.00 

6737. Graduated Burette only of No. 6736 3.50 

673S. Leveling Tube only of No. 673(5 1.00 

6740. GAS BURETTE. Henipel-Winkler. sanu- as NV C.736, bul with graduated hunt,, provided with 

two stop-cocks 10.00 

6741. Graduated Burette only of No, 6740 with stop OOCkfl 5.00 

6744. GAS BURETTE, Hempel's, with compensating tube n rreel for rarietiona b temperataH 

and pressure. Complete with stop-n.-k and leveling bulb, mounted on weighted metal bases, 
as illustrated 22.00 

6745. Graduated Burette only of No. 6744, with three way stop , ■„. k 7.50 

6746. Leveling Bulb for No. C744, mounted on bei vy base 5.50 

6747. Glass Bulb only of No. 6746 Il0 

6750. GAS BURETTE, Hemnel-TutwilPT -i+i. « 

ff , , , ' ™P 84 -™*««, with four-way stop k , compensating tube, manometer, 

water jacket, and leveling bulb, mounted on l,,aw m ,t.,l ,,, J 28 .00 

6751. Graduated Burette only of No. 6750, with special four-way .„,,,., k 10.00 

6754. GAS BTJKETTE. Hempel's, modified by the IHin 0is Steel Company, with burette graduated to 

100 ce in Mo cc division., three-way stop k , and water jMfc-| , ^^ suppQrt 9 . 0O 

6755. Graduated Burette only of No tatu ,. .1 

V JNo. 67.,4, with sp,, ia l three-way stop -nuk 7.50 

L'66 



CENTRAL SCIENTIFIC CO rwrk^n T , o . 

^ ^ u » CHICAGO, U. S. A. GAS CALORIMETERS 






J 



K 



y. - 





Nos. 6780-8. 



No. 6786. 



6780. GAS CALORIMETER, Sargent's Automatic, for testing the thermal value of inflammable gases. 



** 'fltoUfe. 



i^ket fitted vak n* 



*t*l bUM,vfck«]h| 



atrd btirttt fnritt 



for nmti«i> 

1 ... wt&ti ** 



o«pei*tiM 



tfc 






wit***** 



6781. 

13540. 

6785. 
6786. 
6787. 
6788. 
6789. 

6790. 
C791. 
13730. 






.« 



.' 



>• 



Distinctive Features. 

( 1) The discharge water is weighed to one-hundredth of a pound instead of being measured 
in a graduate where errors are likely to occur. 

( 2) The discharge water is switched automatically from one receptable to another after each 
one-tenth of a cubic foot of gas is burned. This eliminates errors due to hand manipu- 
lation. 

( 3) Inlet and outlet thermometers are on the same level so that they can be read almost simul- 
taneously. 

( 4) A wet pressure governor controls the pressure of the gas entering the burner, and a con- 
stant pressure is easily maintained by means of adjustable weights. 

( 5) To maintain a constant flow the inlet and outlet pipes are provided with weirs. A gradu- 
ated quadrant valve regulates the amount of water used. 

( 6) Since a determination can be made every three or four minutes, a curve of the heat value 
extending over any length of time may be plotted. 

( 7) The heat value of the gas is determined directly in B.T.U. 

( 8) The Bunsen burner has two tips and is adjustable for gas having 100 to 1500 B.T.U. per 

cubic foot. 
( 9) The calorimeter is made of copper and brass and is handsomely nickel-plated. 
(10) The wet test gas meter is made of heavy brass and tin and has a water level indicator 

outside of the gage glass. The meter is graduated to 0.001 cubic feet. 
Complete as described above, with calorimeter body, wet pressure governor, wet test gas meter, 
special scales, pair of weighing pails, aud two No. 13540 Thermometers $295.00 

Parts and Accessories for No. 6780. 

Calorimeter Body with automatic attachment, Bunsen burner, tubing, exhaust thermometer 

. , , 150.00 

and beaker ... 

Thermometer, High Grade, graduated from 30° to 150° F. in one-tenth degree divisions, f or 
inlet and outlet temperatures. Suitable for all ordinary work 9.&o 

Wet Pressure Governor, with weights 

Wet Test Gas Meter, with all attachments • 

Scales, Special, weighing to hundredths of a pound. Capacity, 10 pounds -0.0O 

Weighing Pails, nickel-plated, accurately balanced • • • • P er P alr 

Shipping Chest, specially fitted for holding a complete calorimeter ■outfit m ^ «eparate <--»U££ 

ments r" " 1 75 

Tables of Standard Reduction Factors for Gas, in book form j-«j 

Heat Value Computer, U. G. I "' aflMS 

Reading Lens for thermometer 

267 




GAS 



uwnai rnnu. scrammo oo, ohioaoo. p. a a. 













GS10, 




G812, 







G814. 




6816 



6824. 

6830. 

6832. 
6836. 
6838, 



1 




r 



No. 6810 



No. 6812. 






WO. 6816 No. 68'. No. 6830. 







No. 6832. 



No. 6836. No. 6838. 



GAS CALORIMETER. Junkers, M;inn"s liit-liiir.-itiou. for deti Qg the approximate heating 
value of gas. Consists oJ a double sralled copper vessel providod iritn a Dumber of tabes ur 
flues bo arr:iii.i:i'il as ti> receive the heat from a Bunsrii (lame, rhese tubes i og in contact 
with water which is runnin ntinuoualy through the Galorimetei ^i\>- up their heat. A. ther- 
mometer placed in the orifice at the top registers the temperature of srs livery, a seo- 
ond thermometer placed in orifice ;it the bottom registers the temperatui Any 

convenient gas measuring apparatus "ill give lie amount supplied tl (See No 
()Ml' T)ior|« Gage, oi No. 6814 Gas Mi A vessel placed to catch i delivered gives. 
amount of water passing through the Calorimeter. Complete \% 1 1 li BUp] but without gas 
meter or thermometers $13.00 

Thorp Gage, n convenient means oi measuring ipprozimatelj both the pressure and tin- rate of 
flow of n:is. When the gas supply is attached to the inlet an.l the ■■:.|. i i, over the 

outlet at top, theindea reads on left hand Boale the pressure In f water. When testing 

the consumption of a burner, the pressure cap ia am [ ai i thi burner screwed in its place. 

The indicator then registers on the right hand Bcale the Dumber <.f -.-^ . ousumed 

P er hour 16.00 

Gas Meter. Constant Pressure, for use with No. 8810, consisting of a galvanised iron tank 
in which a gas tank having a capacity of about 2 cubic foot is Boated. Only mount 

of otf or water is required. The gas tan* is kept in an upright positionby tf .. rtieal 
guides one of which is provided with a scale so graduated that readings of t'h atents of 




Constant Level Water Tank or Weir, for u 



-se with No. 6810 Calorimeter or anj other device 

-.;',, l n L * a f U " 1 " n "" P important Consists ... , metal tank 

GAS COCKS, see Stop-Cocks. 

gas coL^CTror^r S, ™. sI:,ss ' lo ^ lom » ^ two glass atop-coi .capaeit 3.50 

IS™.^.^ Steel Company's, of glass Jitl , stop-Toe* Capacity, 

GAS COLLECTING TUBE RnhW ">' " i i 1,5 ° 

Bample to be teste,] '.7.7 dounla acting, for use in filling tubes and bottles with 

GAS COLLECTING TUBE WinkW. " V "• •" \ '^ 

diameter, i\± inches." ' Bnc » mth two ,,rass stopcocks. Length, 12 inches; 

GAS COLLECTING TUBES TTmt^" c V V * ' ■«' 5>2C 

cocks. Capacity, L25 .<• ,sv !n ,r ? reau of Mines Form « «'<" &***, with two sto 

• CSee Bulletin W, United States BuroanTof Jhm> page 68) 6.( 

26S 



P- 
00 






II 



T 



\ 



*Q. 



* tfce 



- 






i mta 



••_>, 









" ; ' : '■ 



-• aba 



w*1« 



prtawtuiik 

". 
Tta' 

g , .-itaiMai 
■bra 'by m 






A an*?* 

OB 'I* f* & 

; I kit' 
a-ter * »J •*» 



tuba** 









u t^i 









.,to^J 



6850. 



6851. 
6860. 



6872. 



6874. 



6882. 



CENTRAL SCIEN TIFIC CO., CHICAGO, U. S. A. 



GAS GENERATORS 





No. 6860. 




No. 6850. 



No. 6851. 



1 
No. 6882. 



GAS DENSITY BALANCE, Edwards, developed at the National Bureau of Standards for the 
rapid and accurate determination of the specific gravity of gas. In point of speed it is far 
superior to the method of direct weighing of the gas on an analytical balance, and gives an 
accuracy only obtainable by the latter method when carried out with elaborate precautions. 
The apparatus consists of a balance beam B carrying a sealed cylinder on one end and a 
counterweight on the other. The balance beam with its support is mounted in a gas-tight 
chamber to which is attached a mercury manometer. In operation, the balance case and 
manometer connections are filled with dry air through the inlet I and the pressure adjusted 
by removing the excess gas through the needle valve E until the beam just balances, as de- 
termined by observation through the adjustable lens L of the cross line on the end of the 
beam. After determining this pressure, the balance is evacuated through E and rilled with 
the gas; the pressure is then adjusted until the beam is again in equilibrium. The specific 
gravity of the gas is then the ratio of the total pressure (manometer reading plus atmospheric 
pressure) required to balance the beam in air to the total pressure required to balance it in 
the gas. Complete as described with manometer and mercury for charging, in carrying case 
with directions for use. (See Technologic Paper No. 89 of the "United States Bureau of 
Standards) 12600 

Leveling Bottle for No. 6850, with stop-cocks and reservoir, but without rubber tubing... 9.00 

For PUMPS for use with No. 6850, see general heading Pumps. 

GAS DISTRIBUTOR, with four side tubes and center burner, all with stop-cocks 7.50 

GAS DRYING APPARATUS, see Drying Apparatus. 

GAS GENERATING MACHINE, see Gas Machines No. 6936. 

GAS GENERATING BOTTLES, without fittings. 

l ■< ! * 

17 .25 .35 



Capacity, pints 
Each 



■ « t • 



• ■ • 



GAS GENERATING BOTTLES, same as No. 6872, but fitted with rubber stopper, funnel tube 

and delivery tube. Capacity, pints ™ ^ 6 ^ 

Each " 

GAS GENERATOR, Dropping, Preas. an effective, cleanly, economical method of obtaining any 

gas desired for use. Without flask 

269 









GAS GENERATORS 



N|KV1 . BGEBNTn* .o.,cHi<\« »aiy.a A 




No. 6890. 



f.VAi. 



r.stic. 



6200. 

hums. 



6909. 

6910. 
6911. 
6912. 
6913. 
6914. 
6918. 



G924. 



692H. 



No. 6896. No. 6908. No. 6910. No. 6918. 

GAS GENERATOR. Parson's Improved Automatic, of stoneware, A simple an.l efficient gen- 
erator for tin' jirmliHtmn of liy.irn^rii sulphide, carbon dioxide, hydrogen and othi 
considerable quantity foi Industrial and college laboratoriei in use, th< long uprighl solum 
is filled nearly full of the aeceasarj solid reagenl and tin lowei r<>ir\<ur with crater. The fit- 
tings are then put in place and the appez res i filled with the liquid i ent. Normal pres- 
sure is Boon generated, and as soon as the tenaion V is obtained in the lower reservoir, acid is 
automatically delivered to the top of the column as required and the ^> n< ratoi is ready for 
continuous operation with very little farthei attention. The upper rvoir and the lower 
reservoir and column are of acid-proof chemical Btoneware sn.l all noeeaaarj glass parts and 
rubber stoppers are furnished. Height over all, 35 inches; diamefc I lowei rvoir 14 
inches $45.00 

GAS GENERATORS. Kipp's Apparatus. of ylass, .omplrte with safety funnel tube, 000k, 

ground-in glass Btopper, and rubber stoppers. Capacity, c< 00 10 lOQ 

Each 6.00 7.60 10 00 

Stop-Cock only of Xo. 6896 JjjJ 

Funnel Tube only of Xo. 6Ml>6 .r 

GAS generator for Oxygen, of metal, «••.. inches highj intent,' 2% 'prada! "Generates s 
steady supply oi pure oxygen from Oxone or peroxide of sodium in cartridge form The 
cartridges come in hermetically sealed tin cans, which, when placed in the g. iter, are 

punctured. Each cartridge will furnish about 14 ... L5 gallons of oxvgen, which, if . 
through a wash iM.ttle ......taming water, will he 100 pel ..„.. pure. A* it COmCfl from thVgea- 

erator it is 99..1 per cent, pure ,»« 

Cartridges for No. 6908. 

Each 

Per dozen [ \ \ \ [ [ \ [ \ [ \ \ [ [ [ -JJ 

GAS GENERATOR, Oxygen, "Autoeenor " hi*rh nrA««n~ '* ' 

from oxone at pr^sar^u,;,,,^"^: , V^lT Tlu^ ^ ""* ' *** " '"""^OO 

^n n t;ns ,, of^cSes.: i, . r, : UM : 1 .: ak,S Wdghi118 '^ ^ 7 0UMM -,. yn-hling T,u..;; „;„ each; 

GAS GENERATOR, Hydrogen^ ' ' Autogenor V «" s-i ni V oV N« ' Rain 1' ♦' " " V, ■ P« r ^m 2-50 

_ for generating pure h>droge7frorc Hydrone . ... . °! . 691 °» M "* s '" " '' " ^ 

tra holder, the 

.75 

.. Per tin 2.50 

Each ...... 5 10 

For CONSTANT PRESSURE GAS HOLDER see" Xo ' 68 li ^ ^ 

^^f^ni3hh^ !1 , ;:::i ,un,u ,,v <**«** - ** «* * spark., ,-„,,„ „., „,„, an>- kiI ,i 

Per dozen 40 

Spark Metal Renewal for No 6924 ' 430 

^r dozen ...*._ .15 

1.60 

270 




"_C • 




;»t* lower wm*, 
w punt* ii i^j 

■rt* « »•» n*n*| 

■-. I 

I 

--.coo mjr 

-I 

urn in cirtnd* fa 
pUttd in tW gnafcil 
t7|ct,vL j 
mofwii 

I 

.,ag Ittfof* 

pc M 

* of tto 'J 1 " ** a 

p«- - 
- 

5 ii 

I 



CENTRAL SCIENTIFIC CO, CHICAGO, D. S. A. 



GAS MACHINES 





No. 6936. 



No. 6911. No. 6916. 





No. 6962. 



6936. 



No. 6786. 



GAS MACHINES, Matthews, for the automatic production of gas for laboratory use, where a 
source of natural or illuminating gas is not available. The machine consists essentially of a 
carburetor to contain the gasoline and supply the gas, an air pump or blower to furnish tin- 
air, an automatic mixer for producing the proper mixture, a weight which furnishes the 
motive power for the air pump, and the necessary connections. The entire process is auto- 
matic, it being necessary only to wind the weight up once a day, and to fill the carburetor 
once or twice a year with gasoline. There is no danger in connection with this machine ami 
no extra insurance required as it has been passed by the National Board of Underwriters. 
Complete as described with air pump, carburetor, mixer, pulleys, wire rope, weight holder and 
all necessary connections, but not including gas pipe. 
No : \ B C D 



;;o 



40 



:,u 



75 



E 
100 



P 
150 



G 

L'UO 



H 

300 



202% 
2 

1475 
505.00 



252 
3 

1600 
560.00 



315 
3 

2125 
645.00 



375 
4 

252.'. 
795.00 



437 

4 

8750 

960,00 



6944. 



512 

4 

3000 
1125.00 

B 
50 



770 

4 

3900 
1165.00 

c 

100 

% 

1.50 



Number of burners 

Capacity of carburetor, 

gallons ' ■'•• 

Number of cells - 

Ship, weight, complete, 

including mixer, lbs.. 1150 

Each $415.00 

GAS MEASURING TUBES, of glass, graduated, without stop-cock. No 

Capacity, cc [ y> 

Graduated in, cc ^ 25 

Each 

6946B.GAS MEASURING TUBE, same as No. 6944, bat with glass stop-cock. Capacity, 50 cc, grad- 

uated in V, cc divisions . 

6786. GAS METER. Wet Test Type, witt ital seated to i{. cubic foot m MojgttjJ f^'^, £™ 
wiU iotogra.c 100 cubic M ^°~/»/ pl £%£*& £*„£!& ^h™.^ an! 

Sic Sh fU s n p e ek°nv ada S ??d ToV £*£* woft *. . . '. • - • . ™> 

olsi^TEE Wet Test Type, sane a, No. 6786, but with dial graduated to three htres ,« 
■2i55M2?*3S& adapted for use ia P.ant Phys.ology ^"^ "• » 
GAS PAILADIUM TUBE. Hwpd'l for hydrogen deternnnat.ona. coata.o.ng about 2% gram, 

of palladium sponge 

271 



6953. 



O'.Mli'. 






GAS PHOTOMETERS 



CENTRAL SCIENTIFIC CO., CHICAGO I v. 










W KCMweoa y 

No. 6970. 







No. F6857. 



No. F6851 



ti!i7.i. 







l-v»sr,i. 



F68.i7. 



P6801. 
16803. 
F6817. 

F6665. 



GAS PHOTOMETER, simple form, for dete 

i.i" 

Mtcl 

for 
ard 

Parts and Accessories for No. 6970. 

din's Modifi 
ii -mit light 
u.'il illumina 

O I MImIhi. ai 

to fit No. P180 Clamu accuratelj than with the disapj _ typi Mounted on rod 
candle holder.' tS ■;,;/ ;.-;,;,-,;.; ■„;■■■;;.;,■;.;. ;;••;; - v ; • •-.;._ ».oo 

SO 
:'A 
.40 

******** *VWV*-«* 

grams i 7.776 gram- m w.ix per 
Each -30 

L'72 





^y 



I 9 



CENTRA!, SCIENT IFIC CO.. CHICAGO, XT. B. A. 



GAS PHOTOMETERS 




No. F6933. 



6!»80. 



h 






«f ilhmiaitii* »■ 
■d»pport- 



bi tb*P«*^ 

• " : ' '* '. 

■ 

'I 
. rod t» : ,| 



F6923. 
F6924. 
F6925. 
F6926. 
F6927. 
F6928. 

F6931. 
F693'J. 



F6805. 
F6807. 



GAS PHOTOMETER, Precision Form, designed for exact photometric work and arranged so 
that it may be used with a large number of accessories, adapting it for a variety of uses. 
The bed consists of two large brass parallel tracks, carried on supports fitted with brass lev- 
eling screws with sockets for permanent attachment to bench. The earring are substantially 
made with rack-and-pinion for vertical adjustment with « lamping collar to prevent slipping. 
A pointer extending down to the track indicates the exact location of the center, ('lamps are 
furnished to hold the carriages at any desired point. The observing carriage L6 provided with 
a slow motion screw for careful horizontal adjustment. The carriages are constructed to take 
accessories with a 19 mm rod. Length of graduated portion of track, 300 cm, graduated in 1 
mm divisions. Complete as described with two end carriages, observing carriage, platform 
for standard lamp, and Lummer-Brodhun photometer box with collar to fit observing carriage; 
without standard lamp or gas burner. (For illustration see preceding page.) $452.50 

Parts and Accessories for No. 6980. 

BED, 3 meters between lights, graduated in millimeters 120.00 

END CARRIAGE, for standard or unknown illuminant 75.00 

OBSERVING CARRIAGE, for comparison screen 80.00 

SOCKET, with cord and plug, for incandescent lamp, with 19 mm rod 6.50 

PLATFORM, for standard lamp, with 19 mm rod 7.50 

GRADUATED DISK, to be used on end carriage with incandescent lamp to secure mean hori- 
zontal power of lamp • 18.00 

COLLAR, for use on Nos. F6924-5 when it is desired to use an accessory having a rod 10 mm in 
diameter 5 - 00 

UNIVERSAL COMPOUND ROTATOR, for obtaining mean spherical candle power of an incan- 
descent lamp. It consists of a heavy tram.' that can be clamped to the photometer track. The 
lamp socket is attached to a shaft mounted on ball bearings. This shaft may be adjusted in 
a vertical plane by angles of 5°. It is held to the desired angle by a pin fitting into a slot in 
the periphery of an accurately graduated disk. The horizontal position of the lamp is read on 
another graduated circle. The rotator is provide,! with two Beta of brushes, one for delivering 
the lighting current to the lamp, the other for leads to the electrical measuring instruments. 
The rotator is also provided with all necessary pulleys and belt and may be driven by any 

i n o tj n * . 180.00 

1/12 H. P. motor 

GAS BURNER, with 6-foot tip, mounted on rod to fit No. F179A Clamp 1.20 

GAS BURNER. Welsbach, complete, mounted on rod to fit No. F179A Clamp 2.00 

For COLLAR for use with Nos. F6805-7, see No. F6931. 

273 












GAS PIPETTES 



CKN 



,-ntkai. sriKNTIKie 00. CHICAGO, P. a A. 






No. 7020. 



NO. 7024. 



Ko. 7028. 



7.U0. 

702 1 . 
7022. 
7024 

7025 

7026. 

7028. 



GAS PIPETTES 

GAS PIPETTE. Hempel'ft Simple Absorption, fm soliil or liquid reagents, moon ted on japanned 

iron support with adjustable elampfl *5-25 

Glass Parts only of No. 7ujo •••• 2.50 

Support only for No. 7020 ■■■ 2.75 

GAS PIPETTE Hempel's Simple Absorption, for liquid reagente ualy, mou d an> 

port ' *■» 

Glass Parts only of No. 7024 • • • 2.00 

Support only for No. 7024 2.25 

GAS PIPETTE, Hempel's Double Absorption, for solid and liquid n nta, mounted on iron 

Support 6.75 




7020. 

7030. 
7032. 

7033. 
7034. 
7036. 

7037. 
7026. 
7040. 

7041 
7026. 





No. 7032. 



No. 7036. 



No. 7040. 



Glass Parts only of No. 7028 3 50 

Support only for No. 7028 3 25 

GAS PIPETTE. Hempel's Double Absorption, for liquid reagento ' only," mono on iron Bup- 

1 " rl £« 



6.75 



Glass Parts only of No. 7032 3 ^ 

Support only for No. 7032 i2 5 

& Uppo^ B ™ , .^ a,S 8imfiB Absor P tion - tot Ethylene, with glaafl l,,;, i, „, i 1 on iron 



Glass Parts only of No. 7036 
Support only for No. 7036.. 



6.25 
4.00 
2.25 



mor^n^o^^^..^^,,^ Klaae etop-eo'ck" "and pia^uum' electrod- 

Glass Parts only of No. 7040 

Support only for No. 7040 



9.25 
7.00 
2.25 



274 









* 



• im 



l -.;•-. 
























■ ntei 



Ik 






7044. 

7045. 

7046 

7060. 

7061. 
7062. 
7022. 



CE *TRAL SCIENTIFIC C O.. CHICAGO, U. S. 



GAS PIPETTES 




No. 7044 




No. 7060. 



Glass Parts onlv of No. 7044 

e , / - BA 7.00 

Support onlv for No. 7044 

GAS PIPETTE. Winkler's, for the determination of methane, with removable platinum spiral 

mounted on a metal support with adjustable clamps ... 8 75 

Glass Parts only of No. 7060. Without platinum spiral coo 

Platinum Spiral only of No. 7060, mounted in a double glass tube ".7" ........ 2.00 

Support only for No. 7060 „ K 

••••• *• ' o 







No. 7076. 



No. 7094 



No. 7096. 



No. 7102 



J 



' " 



r. BOtttrf* 



bM k 



7076. 



7094. 



7096. 



7102. 









7128. 
7129. 



GAS PLIERS, see Pliers. 

GAS PRESSURE REGULATOR for oxygen tanks, see Nos. 6552 and 6553. 

GAS REGULATORS, thermostatic, see Theimo-Regulators. 

GAS TIME REGULATOR, for shutting off supply of gas at any desired time. Consists of a 
valve controlled by a lever, mounted on a specially constructed clock. Regulator is placed in 
the line between gas burner and supply, tap. With %th inch passage through valve... 6.50 

GAS WASHING BOTTLES 



GAS WASHING BOTTLES, Drechsel's high form, with tubes ground into neck. 

Capacity, cc 125 250 

Each 110 1.50 

GAS WASHING BOTTLES, Drechsel's low form, with tubes ground into neck. 

Capacity, cc 1-5 250 

Each 1-20 1.70 

GAS WASHING BOTTLES, plain form, with rubber stopper and fittings. 

Capacity, cc 250 500 

Each ... 40 .50 

GAUZE, WIRE, see Wire Gauze. 

GLASS BALLOONS, see Balloons, Glass. 

GLASS BEADS, with hole through center, from 4 to 6 mm in diameter Per pound 

GLASS BEADS, Solid, about 3 to 4 nun in diameter Per pound 



500 
1.80 

500 
2.00 



1000 
.60 



2.00 
2.75 












275 



GLASS CUTTERS 



CENTBAL ■- ,. NTH i »^H ICAnO t U. 8. A 





No. 7136. 




No. 7138. 




No. 7140. 



No. 7148. 










f>T. MN.iir' 



No. 7150. 




No. 7144. 



No. 7154. 






71 3G. 

7138. 
7140. 

7141. 
7144. 



7145. 
7148. 



7150. 

7151. 
7164. 

7155. 



GLASS CUTTERS, ALL KINDS 

GLASS CUTTER. Glazier's Diamond, for cutting or writm^: on glass. Wood handle nicely fin- 
ished; metal parts nickel-plated. Diamond can be reset several timi Cuts single-thick 
glass $6.00 

GLASS CUTTER. Steel Wheel, polished and bronse finish 12 

GLASS CUTTER, Steel Wheel, having bu cutting w h. . Is in :i tut 1 , t bead which may be re- 

solved on or clam] I to the frame. The cutters are protected when not in position for use .30 

Extra Cutting Wheels for No. 7140 p er dozen .70 

GLASS CUTTING TOOL. Parker's, designed to replace the hot til. as an instrument f or cutting 

glass i.v 1,;,, i ini: :i .-,.,,!, ,„ the desired directio Consists b beavi 1 ite ei head. 

attached t«. a -as supplj tube with w ten handle, the whole constituting a burner. When 

the air hii.i -as s, 1|T y are regulated to cause the flame to strike bark, the head becomes in- 
'"" s, ; lv '"'' •'""' r;m , '•" " s "' 1 *" cut glass into almost an; shape desired, although not at a ray 
rapid rate. (See Journal £ Am, ,,, :ill Chemical Society, Vol. \ I . No i, Januarv, wis, page 

1,1 ; 1.80 

GL ^l^ T ,™ G T0 ° L ' T ^ eT ' S ' SA,U '- AS NV :H4 - *« **»*•« ^r use with natural or 

^^itfmmi.n^J^'i Wil1 i"! ^ , ' r '"" ' fc0 ■" "" in diameter! " The 'sitrtto aim 'is gradu- 
Th a >m S Provided Tnth turret head having sis cutting wheels as- in No 7140. 

C*r SET CutUng ^^^Xt^^.^^^ *** : "" , "*» "»*££ 

G ^d ^SSJ^SS^n^i ", l,,1i "r '''V' •■ , " 1 nf 1:: iH ' h -Uusta.d^radunt,d"ar,n,*with six 
T-vJrl r^ti ^ tv "" : ' VV hnm ba8e , ' : '"-' 1 "** ™**« on under side.'.. 5.25 

Extra Cutting Wheel Disk for X,, 7150, with sis wheels 180 

Extra Cutting Wheel for No. 7154 

GLASS INK, Bee Diamond Ink No. 3816. 

GLASS PLATES, see Plates. Class. 

276 



_-■ ' I 
I 



iv**v=^a 



7~*~lI 






ma Cots a^H 

..... U 

-I 

tad vkKkwk 
ipoahotfeK I 

Ptr<M )l 
uuiutroatfir 

- 
.,„ * titk BWJ 

.Vtal aid •*» ""fl 

I 




^?^L5?I5!!TIPIC CO., CHICAGO, U. 8. A. 



GLASS CUTTERS 





No. 7160. 



No. 7168. 



No. 7182. 




No. 7190. 



7160. 

7161. 
7168. 

7180. 



GLASS TUBING CUTTER for cutting tubing from inside. The glass tube is held in fiber rests 
so that the cutting wheel describes a perfect circle. Length, 12 inches; cuts glass of from 
% to 1 inch inside diameter up to 8 inches length $1.50 

Extra Cutting Wheel for No. 7160 20 

GLASS TUBING CUTTER, a highly tempered steel knife with wooden handle. Both sides can 



be used 



.50 



7182. 

7184. 
7190. 



GLASS ROD, best quality lead free glass, in lengths of about five feet. From 3 to 13 mm in 
diameter. Diameters are subject to usual factory variations. Rod in smaller quantities than 
5 pounds if desired in full lengths should be so specified, otherwise lengths convenient for 
packing may be sent. An additional charge will be made for selecting rod gauged accurately. 

Diameter, mm 3 4 5 6 7 8 9 10 11 13 

Per pound 70 .70 .60 .60 .50 .50 .45 .45 .46 .45 

25% discount in lots of 100 pounds of the same size. 

Please specify diameter in ordering. 

GLASS RODS, Stirring, with ends well annealed. Size, inches 5x% 8x$ 

Per dozen 25 .40 



io 



10x% 

.50 

GLASS ROD, soft glass, for sealing in platinum per pound 2.00 

GLASS TUBING, best soft glass, lead free, for gla9s blowing, bending, etc., in lengths of about 
tive feet. Diameter and thickness of wall are subject to usual factory variations. 

An additional charge will be made for selecting tubing gaged accurately inside or outside. 

Tubing in smaller quantities than 5 pounds, if desired in full lengths, should be so specified, other- 
wise lengths convenient for packing may be sent. 

Orders for assorted tubing above 25 mm must be for 5 pounds or more ; orders for assorted tub- 
ing from 13 to 25 mm must be for 2 pounds or more; from 3 to 12 mm for 1 lb. or more. 

10 11 12 13 14 15 



Diam. outside, mm.. 3 4 

Approx. ft. per lb.. . 75 63 

Per pound 1.00 1.00 

Diam. outside, mm. . 17 18 

Approx. ft. per lb.. . 13 12 

Per pound 45 .45 



o 

47 

.70 

19 

11 

.45 



6 

38 

.70 

20 

8 

.45 



7 
31 
.60 
21 

7 
.45 



8 

27 
.60 

22 

6 
.50 



9 

23 
.60 

23 

6 
.50 



21 
.55 

24 

5 ! _• 

.50 



19 

.55 

25 

5% 

.50 



18 
.50 

32 

3 
.55 



17 
.50 

:;:, 

3 

.55 



16 

.50 

38 

2 

.55 



15 

.45 
43 

1 
.65 



16 

14 

.45 

r,.i 

1 
.80 



7192. 



25% discount in lots of 100 pounds of the same size. 

GLASS TUBES, Annealed Ends. Glass tubes of large diameter are not satisfactory unless ends 
are annealed to prevent Longitudinal cracking. We list below a few sizes but can supply any 



prevent long: 

size desired. No A 

Diameter outside, cm 2.5 

Length, cm 30 

Each 35 

No 

Diameter outside, cm 

Length, cm 

Each 



B 
2.5 
60 
.60 
N 
4 

110 
1.80 



C 

2.5 
75 

.70 

R 

5 

21) 

.70 



D 
2.5 
100 
.75 

S 

5 

30 

1.10 



F 
2.5 

l.-,t) 
.80 
T 
5 
38 
1.20 



G 

3 

100 

1.10 
V 

5 

60 
1.30 



II 

3 

120 

1.20 

W 

5 

7S 
1.60 



J 

4 
45 
.90 
X 

5 

!»n 
1.70 



K 

4 

tin 

1.10 
Y 
5 

120 
2.60 



M 

4 

100 

1.75 

Z 

5 

1 ."• ) 

2.80 






277 












OLASS TUBINO 



CENTK.U. srllATlFH' 00, CHI A00. O.S.A. 







1 

o 



No. 7194. 





No. 7200. 



•o 


















1 









No. 7202. 




No. 7206. 




No. 7196, 



I 



I 




© 















7194. 

7196. 
7200, 

7202. 

7206, 



7212 
7220, 



7234. 
7240, 



7242 



GLASS TUBES, Bomb, for Carius and other explosion furnaces, of heavy *oft ^lass, with one 

end closed. Length, ,; " 'in; diameter outsidej -- ram $0.80 

Note: — Other sizes will lie m:i<le t «» order. 

GLASS TUBES, Bomb, for scaling, of heavy soft glass with const ri.t mil for seal ff. Length, 

70 cm ; diameter out side, 22 nun 1.10 

GLASS TUBING, Barometer, heavy wall, outside diameter from <i to 1" mm. In 3 foot lengths. 

Diameter of bore, mm 'A 4 5 

Per pound 85 .85 .85 

GLASS TUBING, Capillary, from 5 to 7 mm outside dinim-ier. 

Diameter of bore, mm ' , '. *, 1 1*4 1*4 \% 

Per pound 1.00 1.00 1.00 1.00 1.00 1.00 1.00 

GLASS TUBING, Combustion, Pyrex, of the sanu composition m the Pyn i boiling ware. Its 
high melting point, low coefficient oi expansion and resistance to mechanical stresses, make n 
especially adapted for combustion work, In 36 inch lengths onlj 

Diameter, inside, nun 4 5 <> 7 8 '.' 10 11 

Thickness of wall, mm 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.5 

Approx. ft. per lb |s 42 32 24 22 20 L6 10 >. 



12 

1.5 

10 



13 
1.5 

Ml, 



15 

1.5 

9 



Per pound 1.15 1.15 1.15 1.15 1.00 1.00 1.00 1.15 1.15 1.15 1.15 



18 

•» 



19 
2 

7 



20 

2 



21 



6 



23 

2 



24 
2 
5 



8 

4 



Diameter, inside, mm Hi 

Thickness of wall, mm 1 ..". 1 .5 

Approx. ft. per lb <t 8 7>/ 2 7 6' .. f.i.. 

Per pound 1.15 1.15 li2 o 1.20 1.20 1.20 L20 1.20 1.20 1.20 

10'J discount in lots of 50 lbs., 20' , discount in lots of 100 lbs. 
GLASS TUBES. Combustion, see Combustion Tubes, pa , I 52 

ErlS 5JKr W i T 5f rmometer - ,vith whi *« back, «■ bo 7 mm in diameter Perpound 

GLASS WOOL, for filtering, etc Per oimce 

Per 4 ounces 

GLOBES, Deflagrating, see Deflagrating Globes. P " P ° Und 

GLOvll' RnbW S, nf? gered ? " i,h ^ l, 1 " lt,,t tn ? rotee1 **■* Si '" «*" »'««■ ^P^ 
u-LiUV±ib, KUDDer, black, nnnhum weight 

SizeKo " 8 9 

.75 .75 



Per pair . 



iT V ^!J,! , ' : ;^ Ki,1 * love Xo - 8 tak * s rubber Hove' No" 10 f 



.80 

.35 

.80 

2.0( 

5.75 

1C 
.75 



Per pair 

Kindly give size of usual kid glove in ordering." 



Bed by surgeons in operating 

7 8 10 
70 70 .70 



L'7* 



-« 



ANTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



GLOVES 





No. 7246. 







8 est ,;' 



ALWAYS 
/READY FOR ^ 



RUSSIA CEH£HT CO, 



No. 7254. 





No. 7274. 



o ■•■!••' -ja ■"* ' - ■ ■>■■«■■- . .' . 9 " ! "!i; i "" i ;,T I- 1 fl 'l' "^ 



No. 7270. 




No. 7288. 



7246- GLOVES, Rubber, Acid Gloves, loose fitting, doth lined, with gauntlets, for handling acids in 

the laboratory. 

Size No 6 8 9 

p er pair $2.50 2.50 2.50 

7247. GLOVES, Rubber, Acid Gloves, extra heavy, loose fitting, cloth lined, with gauntlets, used where 
a heavv elove is desired in plant or laboratory for handling acids or acid materials. Size No. 
12 _ | per pair 3.70 



7254. GLUE, Le Page's. 



7256. 
7270. 

7274. 

7280. 
7288. 



7290. 



Size 
Each 



Bottle 

Small 
.30 



4 oz. 
.40 



■Can 

8oz. 

.70 



lib. 
1.20 



GLUE, Marine, waterproof Per ounce bottle .25 

GOGGLES, Rubber, gas tight, with char glasses lined with mica to prevent transmission^ of 

heat 

GOGGLES, Blue Glass, called Bessemer glasses. Widely used for inspection work in connect i<m 

with steel furnaces, cement kilns, etc 

15 

GOLD BEATER'S SKIN, 6 inches square • 

GONIOMETER AND PROTRACTOR, Penfield's. A graduated ~***J^„?, J^Z 

card, w 

A fine 

is also an accurate g°™™™£'™~~'£> oTinches^and graduation of the semicircle are 

instructions bv Prof. Penfield. Dimensions about 8x15 cm 

GONIOMETER, 'contact, Penfield's "^^* ™«& S^JSSZA 

For other PROTRACTORS, see Catalog T of Physical Apparatus. 

279 






GRADUATES 



,, sotai Bonnrrmo ro„ chicagoo. a_A. 




No. 3592, 



No. 7324. 



No. 7322 



7292. 



7204. 



7300 



7310. 



7312. 

7314. 
7316. 
3592. 

7320. 
7322. 



GRADUATES, Cylindrical, Bee Cylinders, Graduated. 

GRADUATES, Glass, Bureau of Standards Cone Shape, metric measure, graduated to meet the 
requirements of the U. > s - Bureau of Standard! and to pass all Btj 

rajinritv, ««■ L20 00 101 

Each $0.50 .55 .65 .80 1.25 2.40 

GRADUATES, Glass. Bureau of Standards Cone Shape, -am. a> Xo 7292 bol with metric and 
English measure, double graduation. 

Capacity, ounces l 4 8 

Capacity, ce 120 >0 00 1 

Each . '. 60 .65 .90 1.20 1.80 3.00 

GRADUATES. Enameled Ware, seamless, ited on the insidi in ■ ■■ and ouno 

Capacity, ee 1000 

Each 1.70 2.20 

GRAIN TESTING APPARATUS 

BALANCES, Grain Testing, see general beading Balances. 

BALANCE WEIGHTS. Bee Balances. 

BOTTLES, Grain Sample. Bee Nos, 1756 and 1758. 

FORCEPS for Seed and Grain analysis, Bee under general heading Forceps. 

germinating box iw simwinj; proper depth to plant Beeds. or -alvanised iron 15 Inches 
long by 8 inches high, with glass front and back •", of an inch apart, making it . : ,sv • 
serve the germination ol seeds planted at differ* nt depths. Complete with metal shields to 

of Vni?ultunT ( K:m ""' ' a BuUetin N "' 218 " , ' th <' l '""-'«' States Department 

GERMINATING Box! Ganong Pattern; f Y sprouting" and observing VooY .^uVhV fight, rust 

1 1 JT£ it IT V V l •' Il, V■' , d:, r '""" Dimensions, 7% indes Ion! 5 inches deep, 5% 
^™™lJ:' S! ,, ' , ' t " , '• ' ,nchea mde at t! "' bottom 170 

"S*™??^ iuoiamV^For-hoidingm^ 

G ^ NATING . PLATE ' ° f l ""' ,,us ^/iH^e^^dVamiteVbyiie M * ^thatralghS 



GERMINATING 

with m 



ATING PLATF f" * ^ ° f 12 ; 2 ° ' diScount in ^ts of 144 
^ t 1 1 tf ' of «r 1: imtowaro, li inches in diameter by P, i 

K&ffi'SrlWf m germination experiments . 7 * 



13 



inches deep. For use 

.40 



may be numbered if desired the tra - v ls ^vided into in squares wbicli 

ftF.RTVTTNrATTWn td av _<• ' * 'Z ' 1" " ' ' ..*.... . _ 9.00 



7324. GERMINATING TRAY 



ilosired ' , ' nH|n i wiiu i-h squares urn* 

*, ox wood, 18x10x1* im-hes «n»n o 



hes deep 2.50 



U80 



' 






ssmm 




. 




.65 30 
. bitvii " 

i | 

N lie m j 









! ,"iil I I .« 



Ml 



1 

J 



rcspi 

.tiattil**" 






[jMtt«r- For Ufa?^ 



7336. 



7333. 



7340. 



552. 



CENTRAL SCIENTI FIC CO, CHICAGO, TJ. 8. J 




GRAIN TESTING 



No. 552, 




S&4CCS MW/GV 



cc/r-cvT 



aver? wwc* SAXtr 



No. 7336. 




WNfBSlWWl 



ft/MSL 



No. 7340. 



GERMINATION TESTER, Sho-Gro, oil heated, constructed throughout of non-rustablo metal 
and glass. It has a capacity of o trays, each measuring 10x15 inches, so that a laige number 
of samples may be accommodated at one time. The outside measurements over ail are 32 
inches high, 13 inches wide, and 17 inches deep. Since all sides are of glass, the progress of 
the test is always in view. Complete with 24 blotters, a supply of dividing strips and oil 
lamp for heating $18.00 

GERMINATION TESTER, Sho-Gro, same as No. 7336, but electrically heated, with switch for 
three heats 25.00 

In ordering, kindly state voltage of circuit. 

GRAIN CONTAINER of galvanized iron, see Bins and Containers. 

GRAIN SAMPLER, Boerner, designed by the U. S. Department of Agriculture to enable labora- 
tory workers to secure a reliable sample of grain or seed from a larger portion. The device 
consists of a hopper through which the grain falls upon the peak of a large one. Spreading 
out upon the cone, half of the grain falls into the ducts at the base into the inner funnel and 
passes out through one spout; the remainder passes through the outside funnel surrounding the 
cone and is delivered through the other spout. By running either half through a second time, 
and repeating, samples of any size may be secured, each of which contains the same material 
as any other. For complete description and directions for use, see Bulletin No. 287 of the U.S. 
Department of Agriculture. Complete as described, constructed entirely of brass, with recep- 
tacles to catch the separated samples. 

No A B 

Height over all, inches . 

Diameter over all, inches .,'.' „ fi 

Number of divisions ' (Mi i* na 

Each f 500 3500 

GRAIN OR SEED SCALE (Dirt Scale), for aseei tain ing the percentage of dirt in grain or 

Seed. The beam has two rows of marks, the upper indicating the irtukt, ™»J^&*"£ 
ter ounces; the lower the percentage of dirt. In use a sample pound « weighed, sif H and 
replaced in the scoop. The poise is then run back until the beam ba lances The lower row of 
marks shows the percntage of loss by dirt removed, i.e., the percentage of dirt containedm 
the seed. Complete with brass scoop 

281 









GRAIN TESTING 



OBNTBAL » OBNTOTC CO, CH1CAOO, U. & I 




No. 7387. 





No. 7384 



No. 7380. 




No. 7398. 



No. 5732. 



No. 7402. 



7380. 









7387. 



7;:sv 






7398. 



7402. 



5732. 



PAN, Sample, of aluminum; for nee in sampling and inspecting grs . with one end formed 
into ;i spout for pouring out contents, Bti »ng, light, and «-ll ma will not i tarnish: 

upward pitch of spout prevents grain from rolling oat. Recommended In I etin No. 99 of 

tin* Hut can df Plant Industry. Si ■ l '_• inches $2.00 

PROTEIN DETERMINATION APPARATUS FOR GRAIN, see genera] heading, Nitrogen De- 
termination Apparatus. 

SAMPLER, Bag. similar to V : :*j. i.ut for grains. Diameter, £ inch; length, 6 inches 1.50 

SAMPLER, Grain, consisting of two polished brass tones, one fitted inside of th -her and 
having openings mat. bing each other. By turning the handle, the inm i tubi ie r< w Ived, tl 
opening and closing the holes. Length, tin in. in v n.oo 

sampler, Grain, same as No. 7387, but with I" (separate compartments making it . Up to 
note unevenness in loading and also to ascertain the approximate location and quantity of any 
mixture of gram or of dirty, smutty, heating or dam], spots , 11.00 

SAMPLE CANS. Bee under No. 1828. 

SCOOPS, sec under genera] beading Scoops. 

F..r SEED AND GRAIN SAMPLES AND TYPES, send for Catalog of ^cultural Apparataa 

SI wf' ° ornTes V , '[. nlmi,lmi "'- • rding to specifications of the United States D tmsntof 

i ^ •? r ,sl ;""-; ^ 9 ?»e sieve with % inch round holes and one bott. in, nested, 
13 inches m diameter by 3 inches deep pet set 4.00 




sprinkler, Rnbber. for us, with germinating apparatus, x,,. 18756. 

SULPHUR DETERMINATION APPARATUS f , 

Consists of an Erlenmevor i-,sL ll l °? tho l , " ,, '' , S,;|1 ^ Bureaa of Plant Industry. 

500 cc ' mtB 8'ound in stopper and connecting tul Capacity, 



L'M 



I 

I 

I 





CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A, 



GRINDERS 



NO. 7422. 






No. 7424. 



No. 7460. 



No. 1488. 




No. 7466. 




NO. 7468. 



7422. GRINDSTONE, Selected Berea, rubbed smooth, mounted in a cast iron trough, with pressed 
steel base, steel shaft and steel ball bearings. Shipped knocked down. Diameter, 6 in. $4.00 

7424. GRINDER, with clamp for fastening to table 2 inches thick or less. High quality abrasive 
wheel 4 inches in diameter, 1 inch face; gears enclosed for protection 9.00 

HACK-SAWS, see Saws. 

HAEMATOLOGY APPARATUS, see Blood Testing Apparatus. 

7460. HAMMERS, of cast steel, wedge shaped, for b.vaking ores. ^ 

No 

^ . , . 7 16 

Weight, ounces 

_ r 1-10 I- 20 

Each 

1488. HAMMER, Blowpipe, Plattner's, with wooden handle 90 

746(5. HAMMERS, Claw, cast steel. 

No 7% 13 

Weight, ounces 11Q 120 

Each 

7468. HAMMER, Prospecting Pick, of cast steel, square hea,l with Hat face. Kek pint of hardened 
steel. Weight 1V> pounds 

HAND TALLY, see Counter No. 3319. 

285 





HABDNXSS TESTERS OWTBAt BC.KNT.F.r , ■ > ,_C HICAOO, P. B. A. 






No. 7484. 



No. 7492. 



HARDNESS TESTERS 






74M 



7492 



7493. 



7494. 



For a full discussion of methods of measuring hardness of metals, see Technologic Paper No. 11 
of the United States Bureau of Standards. 

HARDNESS TESTER. Brinell Ball Type, for maximum pressure of 3,000 kilogi for deter- 

mining comparative hardness by the Brinell ball indentation method. Toil instrument is con* 

sidered the standard for hardness testa and \t widely used l>y steel ur«rs und users 
throughout the world. The machine is of the hydraulic <> pe, using glycerine as the pressure 
medium. The press is so constructed thai do air can leak In behind the plunger. A special 
feature of this method is the automatic depth gage l,v which the depth of the indentation 
may 1><> read directly without calculation and tin ^responding Brinell number obtained fron 
a table supplied with ea.l, machine. Shipping freight, TOO pound.-*. Com pi < I as described, 
filled with glycerine, with Automatic Depth Gage $350.00 

HARDNESS TESTER. Brinell Meter, a portable instrument for determining the hardneae of 
metals by comparing the diameters of the depressions produced in the teal p and a stand- 
ard piece of known hardness, by a sphere under the influence of the same tore. The ad- 
vantages of such an instrument over other types arc its portability, unlimited range of appli- 
cation, rugged construction and convenience in operation. Complete with one Brinell Meter, 
i- standard 10mm balls, 6 standard ban of carefully determined Brinell hardness, 2 special 
scales for measuring the diameter of indentation, key fur opening instrument and a set of 
direct-read.no. tables, with instructions for use. in leather covered carrying case, 9x6 inches; 

o- i a / ar T n ^ 1 T- h, • 6% P ° Unds - (Unlcss Twined, 3 ban of hardness 170 Brinell and 3 of 
.do Brinell will be sent.) Descriptive booklet will be sent upon request 55.00 

Standard Bars for No. 7492 cach 100 

^wLt^S 8peC i fj : de « ree 0f *«*»«» toired, and give serial number of instrument with 
Which they are to be used.) 

Standard Steel Balls f. r No. 74,2, ,,».„, „, „„„ ,„ ,„,,„„„ ^ dozen w 

286 




CENTRAL SCIE NTIFIC CO., CHICAGO. U. S. A. HARDNESS TESTERS 








R N I 



MetTectajotopchjcJi 






letsod. TiBiMonacn 

;• .-.••■; 

La-i tk*plo«tti 

tk frpck of & a 
Bnn«Q Bubff ihpii 



- ^termini* fr ■*■< 
fc»W 



« of tkt 



\ rtrrriig 



m M 






flirts* 





J* 



I ■*■«* 




No. 7498. 



the 
lug 
the 



vertical illuminator, 
tube (see No. 8654) 



which is furnished with 
D is a polished specimen 



objective; C is the sapphire point. 
right shows the microcharacter with the 



The illustration 
bearing arm in 



No. 7496. 



(Showing Microcharac- 
ter in use on micro- 
scope with the bearing 
arm thrown back, and 
with accessories fur- 
nished with the instru- 
ment. A is the filar 
micrometer eyepiece ; B, 
condensing and illuminat- 
shown in position beneath 
above and to the 
position for use.) 




No. 7498 (shown in use 
with swinging arm). 



749G. 



HARDNESS TESTER, Microcharacter, Spencer, as recommended hy the American Society of 
Mechanical Engineers, for determining the relative hardness of individual grains of the crys- 
talline structure of both ferrous and non-ferrous metals ami alloys including hardened <»r soft 
steels of all kinds and non-ferrous bearing alloys. In connection with the metallograpbic an- 
alysis of a polished specimen for the proximate structural composition of the metal, the meas- 
urement of the relative hardness of the individual crystals of the micro-area may be accom- 
plished with the microcharacter. The instrument is similar in construction to a microscope 
mechanical stage and may be attached to any microscope having a rectangular stage. It con- 
sists of a sapphire point carefully cut to constitute the corner of a cube and accurately mount 
ed so that the three facets make equal angles with the test surface, with one edge of the cube 
advancing in direct line of motion across the surface to be tested. By means of a small weight, 
found to be the lightest which would make a sufficient impression upon the hardest crystal, 
and at the same time produce a cut which could be measured, the jewel point is held with a 
constant pressure against the surface to be tested. By means of the micrometer feed of the 
microcharacter, the surface to be tested is passed slowly and continuously beneath the .jewel 
point The scratch or cut thus made is examined under a microscope giving a magnification 
of about 900 diameters and its width carefully measured by means of a filar micrometer eye- 
piece. The hardness of the crystal may now be obtained in definite units from an arbitrary 
hardness scale which is a eurve on which the readings of the degrees of hardness are plotted 
on the Y axis against the width of the cut in microns on the X axis. 

Complete in case with filar micrometer eyepiece No. 8634, vertical dlum.nator No. 8654, l.ar.b 
ness scale and full directions for use 



$250.00 



7498 



HARDNESS TESTER. Scleroscope. Shore's, for determining the comparative hardness of metals. 
The method consists* in dropping a small hammer from a fixed height upor i the piece being 




l.-ns 


















upon request 
HARDNESS TESTING SCALE, consisting of S Bet of nine minerals, without diamond. . 3.15 

287 




HEATERS 



CENTRAL SH u:\Tin IHICAOO. U. 8. A 





No. 7512. 



No. 7:")00. 




Sand Bath attachmeut 
of No. 751-1. 








7. ".no. 



7512 






7514 



7.115 



No - 75LL Flask Heater attachment of No. 7514. 

HATCHET high grade steel, black finish, polished face and bevel, b< lected white hickory handle, 
■•' i inch l'it -. -J 

HEAT GAGES, see Pyrometers. 9UK 

HEATERS. Electric, for Extraction Apparatus. B i s Extraction Apparatus Heaters, N„s. 5260 and 

"rt^taf^SS'S ""' l 1 ^ U ' "• 5 consisting of ■ box of nsbestos board 

;','"' KnS" ""' ; :""r th . e 5**toa ol ui,,,!, .,,, placed longitudinally heating 

,:, ';—';;•;;•"•'• J |«* do shelf or pan, placed just above the heating ciuj 

rSmhftS i , " " ; --m I,; "" 1 '"' P revents ^ Possibility of ignifcon of inflammable 

- " ,-s " i ';';;" ""n n "- J V"- s, »« l "' : '" 1 ^ which i aovable; has ui openiagi 

switches the a x i ™i h k em0Vabl ! V'^' "" **** ,: aM <* two '"""'i' 1 " I- 1 " 1 »S 

die ;,,,-,;;; T\ "" llln ' ,n| ;-" ,1 -' ll, - h * *• --" esdeairedand rarybf 
in „• v . „ I , , , "" 1 ; V1 "-/ 1 '" top, the flasks be placed directly on the paS 

1 s - ' ; V: ' S ;I 1 " ,, P la • '"" l with "•tar, ■■ » wttei h. By support- 
ing iia^ks above the openings in the top, the instrument I met a bot*ii bath; 

Specifications 

Length over all, including legs, inches 34 

Height to top of box, inches. . 

Diameter of holes, in< bee " -\' 

n„ i * ■> .? ower . consumption, maximum, watts mm 

^^.tr,:!':';;;'';:;:,,;^!:,;;:;;'''- 1 '' «* »« - u* »p. ...• +, for... 

No, 

Fur Vnits!!;; \ b 

Each 110 220 

HEATERS. Electric Combination' Flask' SanrV W.Vh ' ' * V V; 60 - 00 6000 

able unit. and witi. i .;. ! • i *' ? and Bath - and H <>t Kate. Constructed with repls 

control 

temperature 

Tactions. 

P^g. No. .....;;::;;. 1 J " 1IU ' nos ■» ** inches deep; and with Wnec*tini cord and 

For volts \ B 

_ Eacn lin 880 

Extra Heating Units for X... 7.14 "42.50 42.50 

4.00 4.00 

288 



I. ■ 
m 



J j I 

■ 



a 



_ ;;, 




kster attadi«t(]||| 



JinmsHeateaUSii 



• 



.: InttM 



* ! 

• • bilk. fy*| 

m* i loMir bttk 






i*!*H 



M 



A 

110 

r Jo. f* ^.JS 
^ I, 

B V 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. a. 



HEATERS 





No. 7558A. 




No. 7562 (in use). 



75i 



7538. 



7556. 

7558 A 
?560A 
7562. 



7570. 



7572 









No. 7570. — - No. 7572. 

HEATERS, Electric Immersion, Cylindrical form, made of copper and brass, nickel-plated 
Diameter of cylinder, % inch; length oi heater, 7 inches; weight, :t » pound; power con- 
sumption, 350 watts. Complete with connecting curd, attachment plug and special switch- 
plug. No A B 

For volts 110 220 

Each S5.25 5.75 

HEATERS, Flask, sheet iron, see Flask Heaters. 

HEATER, Instantaneous Water. (Jives hot water in three seconds after the gas is lighted, and 
in one minute will give sufficient hot water for washing hands. Total height, 9 inches; gas 
supply required, :: s inch cdear bore pipe an 1 tap; maximum gas consumption tin culdc feet per 
hour. Heater complete with burner, as illustrated 10.25 

HONES, see Microtome Accessories. 

HOSE, Rubber, see Rubber Tubing. 

HOSE CONNECTOR, brass, for rubber tubing, with thread for ordinary hydrant or kitchen 

bib ™ 

HOSE CONNECTOR, brass, for smooth faucets. For l 2 inch faucet 60 

HOSE CONNECTOR, brass, same as No. 7.158. For % inch faucet .60 

HOSE CONNECTOR, Universal, not threaded, but merely slipped on a faucet and fastened with 
a chain. Can be quickly attached to any watei faucet. The simplest device for attaching 
filter pumps, stilN, water motors, turbines and centrifuges to s common faucet. It ta prac- 
tical, self-tightening and air tight 120 

HOT PLATES Electric, round form, three heat, with cast iron top and pressed steel bas.- f with 
regulating switch. Furnished with six- feet of cord and lamp socket plug. -May be used on 
either alternating or direct current circuits. C Btze requires special wiring 

x- «» ^ 

HO q 

I tiameter, inches ' ng? 

Power consumption, minimum watts lojj 

Power consumption, maximum watts ' ' '* 

Each - * 25 xa ' ou 

HOT SE£|£ME re°S«lar form. ft, tart, wit! 4 M X , rtl I*»P 

socket plug. With three plug switches to control heat. R 

*J°- ■••••; '.'.'.'.'.'.'..'..'.'.'.'. »xl2 12x18 

v,/ "- mcaes • , 0fl 550 

Power consumption, minimum watt? ss(| ,--,, 

Power consumption, maximum watts 35 00 60.00 

Each 

In ordering kindly state voltage. 

289 






HOT PLATES 



CENTRAL «riKXTI FU;r0. t <'HI('ACiU. t-. »• A. 




No. 7578A. 




No. 7588. 




No. 7692 









7578A.HOT PLATE. Electric, Grid Type, throe heat, with heati rarface 6% incl In diameter; 
height of plate, 5 inches i greater amount «»t heat maj be obtained from this plate than 
from other forma, ;i^ the heating unit i> In the open and direct radiati tained Pro- 
vided with a switch in the cord giving three beats, con ing 165, 330 o watts; 
ished in oickel-plate. Shipping weight, L7 pounds. Complete with 7 i. i eting cord 
and attachment plug, Cor 110 volt circuit $11.50 

75794 Extra Heating Units for No. 7578 each 4.75 

7588. HOT PLATE. Electric, Hoskins Type MA-101. for use on either A.< . or D.< . ritfa I Hie 

heating element of Chrome] wire guaranteed to last one year. With top and logs of bei 
east aluminum, and with replaceable spiral resistance unit. Beat distribution rm over 

top. Very useful for evaporating solutions, drying precipitates, etc, >ila - of water 

from cold in L5 minutes. Diameter, 6 inches; power consumption! 5O0 w maximum tern* 

perature, 483°C. or 900°P. Complete with 6 feet of flexible cord attachm 

plug. 

No \ I; 

Por volts ^ II 

Each .....!!!!!!!!!!!!!!!!!!!!!!!! 10.00 10.00 

7590. Extra Heating Units foi No. 7588, 

No v b 

Each 1 . . \ 3.50 3.50 



759 I 




M .»*-;«».,«» * ' -' » 'ajioraiing iu urviivss euuirii vi "■""' ■ 

nectorplug Com &** "** 6 feet of twin-conductoi flexible cord with detactablfl eon- 

No B 

Each ■ ::::::::::::::::::::::::::::::::::::: £* A 

Extra Heating Units for No. 75»2 each 350 " 3.50 

m £r&£?& ^'t^^iSK^'^j^ '" '"- - "» '""" 

2i»0 






CENTRAL SCIENTIFIC CO, CHICAGO. U. S. A. 



HOT PLATES 




V *-;; 




NO. 7596. 




No. 7602. 




No. 7610. 



736. 



-. >-; 



.. 



r Witt 






A 

mi 



i 









A 



. IB 



ik 



330 



7597. 
7002. 



76(1.5. 



7610. 



HOT PLATE, Electric, Hoskins Three Heat, for variable temperatures, with replaceable unit 
for use on A.C. or D.C. Three heats are obtainable from parallel win. lings, controlled bv a 
snap switch ou the front. High heat boils one liter of water from cold in 20 minutes. Size 
Of hot plate, 12x18 inches; maximum temperature on low heat 246°C. (475°P.)j on medium 
heat, 315°C. (600°F.); on high heat, 400°C. (750°P.); power consumption on low heat, 800 
watts; on medium heat, 1200 watts; on high heat, 1800 watts. Mounted on four square steel 
legs with aluminum finished steel top, complete with 6 feet twin-conductor flexible cord and 
detachable connector plug. 

No A B 

For volts 110 220 

Each $50.00 50.00 

Extra Heating Units for No. 7596 each 12.00 12.00 

HOT PLATES, Electric, Multiple Unit Three Heat Type, with replaceable units. Can be used 
interchangeably on 110 and 220 volts, either A.C. or D.C. The method of construction forces 
beat to the top, providing a higher temperature than is usually attained with li<>t plates with- 
out increased current consumption. By shifting connections at the rear from the 110 volt to 
the 220 volt pins, the number of heats obtained on 110 volts is doubled. All sizes give ;i max- 
imum temperature of approximately 750°F. (400*C.)j on medium heat, 600°F. (315 C C); on low 
ln.it, 400°F. (205°C.) Made of cast iron with removable cast iron tops. Bases are finished in 
optical black. No. 44 is especially suitable for extraction work. 

x* i'i qo 32 44 

Size, inches ".'.'.'.'.'.'.'.'.'.'.'. '.'.'.'.'.'.'. '.'.'.'.'.'.'.'.'.'.'.'. 12%xl2% 18x12% 24x18 4^x24 

Shipping weights, pounds 45 74 127 40 . 

Power consumption on low heat, watts 352 520 -'"" 

Power consumption on med. heat, watts 704 1"30 2"-><> 

Power consumption on high heat, watts 1056 L550 WW J0O 

Each . 37.50 55.00 80.00 32.50 

Extra Heating Units for No. 7602. 

Number required - _*_ -?L , ~ n 

Eacn . _ m " 5.00 6.00 6.00 4.00 

Note:— A double-pole knife switch of the proper capacity should be used to open aud close the 
circuit to Hot Plates Xos. 759<j 7602. 

HOT PLATES or Drying Tables, for use with gas. The top is of one piece of steel, with pol- 
ished surface; the legs and frame are of cast iron. Flame easily regulated. Gives an even 

temperature, 

Kn A B 

NO. 10x18% 14'..vl-', 

Size of plates, inches 2 

Number of burners - 12 00 1800 

Each 

291 









HYDROMETERS 



CBNTHAL BCIENTIFIC CO ■ ' ' H ± 












HYDROMETERS 




7622 



:«v. 



'62S. 



i 






763S, 



7639. 



7644 



7646. 



7652. 



7654. 



7i ;.->•> 



HYDROMETERS FOR GENERAL USE 

HYDROMETERS. Baumc. for heavy liquids, highest quality. . ^ 

aboul n inch. -. Q iduat< ' ' ' 



\ 



SI. 50 



10 
1.50 



I 
1 1 1 50 






150 l^o 



n g, degrees Baun i 

Bach 

HYDROMETERS Bauiue. for heavy l.quids, highest quality 

nb< 1 1 inches 

Nl> \_ 

Rg ■ , decrees Baum£ 

Each '- L* 

HYDROMETER. Baume. for heavy liquids, medium grade. 
. li\ isione \-> ngl b, about LI incl .60 

HYDROMETERS. Baume. for light liquids, highest qualin , lh 
,ul 11 inches. Graduate I 60 F 

\.. \ H C D I. i G H 

Rai 1 B mm' 90 80 -"7" 60 10 » iq 

Each 160 1.60 l.bu 160 1.60 1.60 1.60 1.60 

HYDROMETER. Baume. for light Liquid*, medium grade. I • 10' in 

divisions. Length, it 11 ii ..... .60 

HYDROMETERS. Specific Gravity Scale. Precision Grade. i. woi 

degree of ac< ■>. Gradua at 60 F\, in 0.00] divisions. Length, aboul 15 



No. 
A 
B 

' 
I» 

I 
i 
G 

It 

I 
.1 



Range 

700 to .760 

7. ;n to .820 

820 to .880 

880 to .940 

940 to 1.000 

i to 1.060 

60 to 1.120 

1.120 to 1.180 

L.180 to 1 240 

1.240 to 1.300 



Each 
$3.00 
3.00 
3.00 
3.00 
3.00 
00 
3 00 
3.00 
3.00 
3-00 



No. 

I 
M 

\ 



p 

V 
B 

T 



Range 

10 to I. I 

i ;60 to i ■ 
1.420 to 
1.480 t 
1.540 to 

i 600 I* i • 

1.660 to 1.7 

1.720 i" i : 

I 7 8( i to 1.8 

1.850 to I •-' 



Each 
3.00 
3.00 
3.00 
3.00 
3.00 
3.00 
3.00 
3.03 
300 
3.00 



HYDROMETERS. Specific Gravity Scale. Precision Grade, consisting iw.i.r spimlles 

listed under No. 7638 togethei with tw< on Bpindles bj dm ins of which on i aj ie 

termme quickly which si ngl« spindle to use. Th< BeVction spii 0.700 

!" '• : ""' l. 000 to 1.950 respectively and hav< enclosed thenno read- 
ings. Complete as described in plush line l c is< 



75.00 



HYDROMETERS, Specific Gravity Scale, for heavy liquids, medium grade. 0.002 

dn isions. Length, about 11 in< bes 

No ^ i. | , , p 

ii : "r''- Z™ " v l.00« 300 1.2 I r i 1.401 U 600-1.8 I.SOn-i 



Each 



.7;. 



.75 



.75 






.75 



60 



m ™^™ s i*^Vnx Sc * 10 - for iight hqmds - mcfiium grade - - ] u ' 



No. 

Range, gi u\ it v 



H 



D 



Each " ' B * ttV "J 0.6 Jim - i. son 0.80 9 900-1 

.75 .75 .75 75 

^SfLTT" 55fl "!" W hC GraVlty Scales ' for *" "*** ordloary ^ 
"•"l divisions. Length, about U ,,'V]',. '"" I '""" ' '" a s, " v "" - ,:m 



grade, 
in 
75 



292 






%£li§5ii£Bl&ip$ 









CENTRAL SCIENTOTC CO., CHICAGO U. S. A. 



HYDROMETERS 





No. 7660. 



'• I 



Vt^ 



' I 



- -. 

lv 



"■*' > V, 



ditj^ 





• < 


-' J 


1.60 


F 




• 


„ 1 











id. 



BSSfl 







,t 






- 


• 




• • 


% 


to LfM 




ft* 




i of »kifi *" 






itaa pi* . - 1 ' 












jndtp^^ 1 



uaB £»*• ? n * lBC 


















C 




No. 7698. 



7iW.it. 



7664. 



HYDROMETER, Combined Baume and Specific Gravity Scales, for light liquids ordinary grade 
graduated trom 100- to 10" Baume in r divisione, and from o.GOO to ImT^S^S^ 
0.00a divisions. Length, about 11 inches SO 70 

HYDROMETER, Universal, Combined Baume and Specific Gravity Scales for light and heavy 
liquids, medium grade, graduated from l»o° to 10° and o° to 70° Baume in r divisions: from 

O.bdu t.» l.UUU in O.'.H divisions, and 1.00O to 2.000 in ...01 divisions. Length, ai.out 16 



inches 



1.20 



767m 
7674. 



7n78, 

7.;su. 

7684. 
7686. 

70 ;rj 
7698. 



7704. 
7652B, 



7720. 

7724. 



7726. 



HYDROMETERS FOR SPECIAL USES 

HYDROMETERS. Acid, Bee Hydrometers. Baume. 

HYDROMETER, Acid, Specific Gravity Scale, medium grade, for use in Baheock milk test. 
Graduated from 1.800 to 1.850 in 0.001 divisions Length, 6 inches 70 

HYDROMETERS, Alcohol or Spirit, United States Internal Revenue, Per Cent, of Proof Scale, 
highest quality. Length, about 8% inches. 

No A B C D E 

Range, degrees 0-100 80-120 100-140 130-170 160-200 

Graduated in, degrees 1 ',._, i^ i._, i._, 

Each 2.50 2.50 2.50 2.50 2.50 

HYDROMETER, Alcohol, Proof and Tralle Scales, medium grade, graduated from loo below 
to 100° above Proof, and from 0" to LOO" Tralle in P divisions. Length, :ii t 11 in.. .70 

HYDROMETER, Alcohol, United States Custom House, Proof and Tralle Scales, medium grade, 
with enclosed thermometer. Graduations same as No. 7678. Length, aboul I s inches. With 
correction scale 3.50 

HYDROMETER, Alkali. Baume Scale, medium grade, graduated from 0° to 60° in 1° divisions. 
Length, about 11 inches .70 

HYDROMETER, Ammonia or other light liquids, Baume Scale, medium grade, graduated from 
10° to 50° in 16" divisions. Length, about n inches 70 

HYDROMETER, Barkometer Scale, for tanning liquids, medium grade, graduated from 0° to 
65 (l.ooo to 1.063 specific gravity) iu 1° divisions. Length, about 11 inches 60 

HYDROMETER, Battery Syringe or Chargometer, Specific Gravity Scale, ordinary gTade, grad- 
uated from 1.1 to 1.3 in 0.005 divisions. Length of hydrometer, 3% inches; length over all, 

12 inches. Complete with g 1 quality rubber bulb and glass syringe with unbreakabl 

flexible rubber tip -^ 

HYDROMETER, Benzine, see Hydrometers, Oil Testing. 

HYDROMETER. Calcium Chloride Salometer, highest quality. for Bpecific gravity of brine. 
Graduated from 0* to 120° in 1* divisions. Length, about 11 inches 1.50 

HYDROMETER, Ether, Specific Gravity Scale, highest quality, graduated from 0.700 to 0.800 in 
0.002 divisions. Length, about 1 1 inches 75 

HYDROMETER, Gasoline, Bee Hydrometers, Oil Testing. 

HYDROMETER. Glue, Baume Scale, highest quality, graduated from 0° to 35° in %° divisions, 
for use at loU°F. Length, about 1 1 inches 125 

HYDROMETER, Lime Sulphur (Li-Sul-Sprayometer), Baume and Specific Gravity Scales, me- 
dium grade, New York and Pennsylvania pattern, for testing lime-sulphur wash used in spi 
ing. c.a, mated from 0° to 38° Baume, in V divisions, and from l.ooo to 1.3..0 specific 
gravity, iu 0.005 divisions 

HYDROMETER, Lime Sulphur, same aa No. 7724, complete with 12x2 inch glass jar in carrb 



board case with directions for us 



j:m 





















HYDROMETERS 



sTR .u iuntotc oa, chicaqq, u,ai 




7730. 
7782, 

7784. 
7740. 



774V 



774 » 



7752 



7752. 



7754. 
7753. 



77-".s. 



77<>n. 



7762. 



7768. 



No. 7730. 




No. 7732. 




No- 7758. 



HYDROMETER Milk, Lactometer Scale, ordinary grade, graduate.! from t ... in 2 « a^, 
■ions Length, about U indiee. Graduatedai •"••■• •• 10.75 

HYDROMETER Milk Quevenne's Lactodensimcter. medium grade, with enclosed thermometer 
eraduated from 14 to 42 1.014 to 1.042 specifi. gmsitj] In i Livieiona. L ratU 



UH'lll's • _ o./o 

HYDROMETER. Milk, Quevenne's Lactodenslrneter, samr :i> N.. - .32, out mtl it enclosed tl 

mometer. Length about 10 inchea.., •■■■■■•'•••■■■■■'••/■■.■.■■■• . -W 

HYDROMETER Milk. Lactometer. United States Department of Agriculture Dairy Division Pat- 
tern. Specific Gravity Scale, highest quality, g lated from 24 
gravity) in ',,, divieioni (See Bulletin I I the Bureau of Animal I ml u*t^, l Iul , 
Dcpartuii-ut of Agriculture, page 160 Length, abonl 11 inchea 375 

HYDROMETERS. OIL TESTING 

HYDROMETERS. Oil Testing, small siae, Baumc scale as adopted by the U 8 Bureau of Stand- 
ards, modulus 140. unh enclosed thermometer reading from - to 1-'" I D M ,, a || 
test jar. Length, abont 7 inches. Graduated In I" divisions to read so ivity at 

N.. i " B 

Bangs, d Ha time" 40 

Each 25 5.25 

HYDROMETERS. Oil Testing, small sue. u si No B, out with i American Petroleum 

Institute scale new accepted by the r. 8, Bureau of v :n.l:ir.K modulus 141.5. 

No. ' \ B 

Range, degrees ATI 

Each 5.25 5.25 

HYDROMETERS. Oil Testing, small size. Baurm- scale, modulus 140. saan "74$, but with 

smaller ranges and liner divisions for very accurate readings when Bmall — only are 

available. Graduated in ',-, divisions, 

No \ B I> i G H 

Range, degrees Baume 10-21 10-3] 29-41 19-51 19-61 :i 09-81 fell 

Each 5.75 75 5.75 5.75 5.75 5.75 75 5.75 

HYDROMETERS. Oil Testing, small size. American Petroleum Institute scale. - N... 77 

but with smaller ranges as in No. 7752. 

No K L M N P K S T 

Ran-.., degrees A. P. I LQ.21 19-31 89-41 89-51 49 .;i .;i 69-81 79-93 

Eacn 5.75 5.75 5.75 5.75 5.75 5.75 5.75 5.75 

hydrometer pocket carrying case, of nickel-plated metal, toi small hvdros 
Complete with hydrometer jar and & I cover for hydrometer. Length, 7% i lies... 1.00 

HYDROMETERS. Oil Testing, regular size. Baume scale, modulus 140. with enclosed thermom- 
eter, with scale reading from 20 to 120 l'.. for ass in 12 or 1 5- inch hydrom- Length, 

about l.» iii.hr-. Graduated in '» .li\ inluhs. 

g° ;« •••; \ B C D 

Bange, degrees Baume ](l40 . 7,1.100 

Eactl c 99 n r 7c E *7C 5 *75 

HYDROMETERS Oil Testing, regular size, -.m,, ;1 , v, 7750 i„, t w " it |, American Petroleum In- 
stitute scale, modulus 141.5. 

Range, degree* LUX" V. '.['.'.'.'.[ \\\\V""//^]y""/ m ]' m i,'',,, ,,!,;, J'm, ;h-Kki 

HYDROMETERS. Oil Testing; re^lar siz^ Baum. scale. aeNo mL* wltt J2L 

SEEL™ V "' y fine dlv,sl ""~ '"' — wfcaa greatest accuracy is required. ted ... ' 



divisions. 

No A B c 

Bange, degrees Baume 10-21 i'»;i •>«>,, 

55^:: 625 625 ~6.25 



D 
51 
6.25 



i 

E 

49 61 

6.25 



6.25 



"•> .\, out with smaller ranges as m \,,. 7760. 



H 

• 91 
6.25 6-25 
same as No. 



Range, .]r- r ,. rs A- p £] "" lQ 2] 



Each 



6.25 



D E P H 

29-41 39-51 40-61 59-71 - " A 



HYDROMETER Salt SalomPtPr »^J 62{ !> 6 ' 25 6 " 25 6 25 6 " 25 625 625 

Length, about 11 ,S" .. medlura S rade . Seated fro,,, 0« to 100« in V division* 

294 










CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 




HYGROMETERS 




No. 7796. 



No. 7808. 



No. 7810. 



No. 7814. 



No. 7826. 



777. HYDROMETERS, Sugar, Brix Scale, highest quality, graduated in i l0 J divisions, for use at 
17V->°C Length, about 1L» inches. 

No V B C D E P G 

Range, degrees Brix 0-10 10-20 20-30 30-40 40-50 50-60 60-70 

Each $1.75 1.75 1.75 1.75 1.75 1.75 1.75 

7774. HYDROMETERS, Sugar, Brix Scale, medium grade, graduated in V 2 ° divisions, for use at 
17*2 °C. Length, about 11 inches. 

No A B C 

Range, degrees Brix 0-30 30-60 60-M 

Each 75 .75 .75 

777fi. HYDROMETER, Sugar, Brix Scale, highest quality, for waste and wash water. Graduated from 
—6" to +5° in W divisions, for use at 17%°C. Length, about 11 inches 1.50 

77S2. HYDROMETER, Syrup. Baume Scale, medium grade, graduated from 0° to 50* in 1° divisions. 

Length, about 1 1 inches 

HYDROMETER JARS, see Cylinders. 

7796. HYDROMETER, Nicholson, constant volume. Of brass, about 27 cm long over all, neatly 
finished 



2.75 



7809. 

781". 
7814. 

7815. 
7816. 

7817. 
7820. 

7821. 

7822. 
7823. 
7826. 



HYGROMETERS 

HYGROMETER, Simple Form, for indicating the humidity of the air without reference to 

tables. In spun brass case, 3 inch dial 

HYGROMETER, Hair. Scale denotes the humidity of the air without reference to tables.^ In 

brass case, 3 inch dial 
HYGROMETER 

a I 

board Sy, 

CISTERN only for Xo. 7814 

THERMOMETER, Dry Bulb, for Xo. 7814 

THERMOMETER, Wet Bulb, for No. 781 1 



UROMETER, Mason, for determining humidity and dewpoint. Metal scale thermometer of 
•proximate range from 10° to L20°P., mounted with insulating support .... a mahogany finish 
,1.1 M.x4>.. inches. Glass cistern and special wick, With complete humidity tables... o.OO 



.75 

2.00 
2.00 



HYGROMETER, Mason, simpler form than Xo. 7814. Thermometers not raised, mounted on oak 

board S 1 -x4 ' . inches. With complete humiditv tables 



CISTERN only for No. 7820 

THERMOMETER, Dry Bulb, for No. 7820 
THERMOMETER, Wet Bulb, for No. 7820 



.75 
1.60 
1.60 



HYGROMETER, 'Standard, eonsisting of two_ Standard Th^r^n.ters^e^^l^ 



mounted „„ a finely polished hardwood back 17x5 inches, metal cistern w»» ™ ., ...... ^ 

certificate for each thermometer 

295 






HYGROMETERS 



OBNTBAl BCIENTIPIC CO, CHICAGO. U. 8. A. 





























No. 787 




No. 7848. 



No. 7880. 



783i. 



7833. 

78:-: 4. 
7s44. 

784:.. 
7s48. 



7849, 
7852, 



7853. 

7860. 
7870. 
787 J, 

7874. 



7s7.; 



7880. 



No. 7832. 






No. 7874. 



No. 7876. 



HYGROMETER (Hygrodeik). .in in: ed form of rb< Mason I! I of 1 

thermometers, n ind dry bulbs, mounted upon tl itei i oi I has b< 

I from at * and eorrei ted t.ii.i. i prepared under th< 8. Weal 
Bureau. This chart, while complicated In appearance, ■ - ver\ simp] 

the use of tables foi temperatures between 20 ...... I 120 d Fahrenheit. - itro- 

""'" , ' ] " Ki < v; inches, 11 direct - t . vritfa 

THERMOMETER, Dry Bulb, t, - 325 

■■«■ ■_ " " 0-~d 

THERMOMETER. Wet Bulb, for No. 7832 3.25 

HYGROMETER, Registering (Hygrograph). foi furnishi'i i'ity overs 

P enod "' ' days. Complete with 1 harl foi 60.00 



CHARTS for No. 7 



HYGROMETER Slmg Psychrometer. .1.-. the pui 1 ol 

•'""•' 1 , ; 1 , "^ ,J|,S '' P«mW« with the stal ti? wet and dn 1 

uiti'' '" M ,"""i ,V '" lh ^cted, are mounted on a ,1, finished met 



THERMOMETERS 



r 55 2.50 

and dmw 

t& Two 

e provid 

ot in use. 

6.50 

only ol No. 7^ 1 v Each 160 

^2S?S?W^5ift^S* :P S ,B ???9^ ■ifiaairt'oiiii; Similar' i 76 th thermom- 

16% inchef long ' Lr ' : " 1 " : "'" '" ,i: '" «V« divisions, and with ■ r pr. . em 

THERMOMETERS only of No. 7852 v „ h l \f Q 

^GROMETER WICK, Sllk . „, £ h - ;,;„., — ; ; ; ; ■* » 

ICE CTOMi ?^ Catt 7 a8 ' ?^ X38 Cm ' f01 '"-'-^ - - -25 

purposes. Sn^eVironf^m. \il2Pfifti? '" s, " :i " bits " , ' :1 "" ' laboratory 




ICE SHAVER for shavinirice coar«P ' ,' V ,' 18 "?° 

steel cutter ... ' '" '""'• :i ^ r "«'y be desired; of tinned iron with removable 

raNmOKTTOES.seVoombn^niiW;^l^ 



• • • • • 



-.••••• 



.7i' 



296 



- i 




CENTRAL SCIENT IFIC CO., CHICa,,,, , . s. 



INCUBATORS 



^ 

^ 



INCUBATORS, 
ALL KINDS 








-■: 



tatarfi 









I- 



-.m*!" 



WB.W - 




Wflifo - ■ 




A 




1 


7890. 
7891. 



Nos. 7890-1. 

DeKHOTINSKY ELECTRIC INCUBATORS FOR PRECISE WORK. 
INCUBATORS, Triple Wall, DeKhotinsky Electrically Heated and Regulated fPatented), de- 
mgned to provide a dependable incubator to meet the most exacting requirements of the 
bacteriologist. 

Construction: These incubators are constructed of asbestos slate on a steel frame and are well 
finished IB white enamel with all metal parts nickel-plated except the base, which L* 
japanned. Three walls are provided, the space between the two outer walls being packed 
with the most efficient insulating material available, an 85 per ceut magnesi.. afl 
bestos mixture, which effectually prevents radiation of the internal heat; ami the 
space between the inner walls, used to conduct the heated air upwaid from the 
heating units in the base, aids in distributing the hot air uniformly. Ports are provided in the 
inside walls of the incubator for the entrance of the heated air into the incubating chamber, 
in which it passes up and out through an opening in the false top. The location of these parte 
has been carefully and scientifically determined so as to provide a continuous current c»f 
heated air to every corner of the incubating chamber making the temperature uniform through 
out. This feature (patented) is peculiar to the DeKhotinsky Triple Wall Incubator, and in 
sures a uniformity of temperature not possible in electrically heated incubators of any otheT 
type. Double doors are also provided, the outer door being double walled and packed with 
the magnesia-asbestos heat insulating material and the inner door is of glass for the inspec 
tion of the interior without cooling the contents. The outer door is beveled on the edges, mak- 
ing close contact, when closed, with the walls, thus preventing leakage of heat. Between the 
two doors is a dead air space for insulation purposes. 

Heating of the incubator is effected by means of our standard heating units of Chromel wire 
wound on mica strips. These heating units are mounted in a removable tray or drawer which 
facilitates their removal for inspection or replacement without disturbing or materially 
cooling the contents. One of these heating units is connected in series with the contact points 
of the thermoregulator, while the remainder are connected in parallel to the switch contact 
springe and may be added to the circuit one at a time to obtain any desired temperature. 

Temperature control of the incubator is secured by means of our bimetallic thermo-rcgula- 
tor (patented ) which is made from invar-brass ribbon, and can he set at any desired tempera 
ture from that of the surrounding air up to the maximum heat capacity of the inctibator, Ihia 
range of temperature permits the use of these instruments as incubators, paraffine baths, drying 
ovens or sterilizers. The precision of action of this thermoregulator is ^4°C. The make-an d 
break contact of the thermoregulator is located outside the incubator, to prevent the possi- 
bility of ignition of inflammable gases, developed in the inner chamber when used as a dry- 
ing oven, which often occurs when the contact is made and broken inside. A pilot lamp on 
top of the incubator is connected in scries with the thermo-regulator, enabling the operator 
to determine at a glance whether the incubator is regulating. These instruments can be oper- 
ated on either A.C. or D.C circuits. Complete with receptacle and five feet of flexible asbestos 



covered cord with Beparable attachment plug. No 

Height inside, inches 

Width inside, inches 

Depth inside, inch 



••••■••* 



B 

12 



Shelf apace, square inches <5140 00 

For 110 VOltS i Tn no 

For 220 volts H00 ° 



C 
19 

17 
14 

17.; 

220.00 
220.00 



2y7 






INCUBATORS 



OBNTBAL SCIENTIFIC «'Q., CHICAGO, IT. 8. A 













IT 

No. 7898. 

rs;»s incubators Single Wall, DeKhotinsky Din il ill Bill Safttsd sad Rafnlitad Patented), aim 

l>im< tallie i nermo regulator. 

Construction: The incubator is built of 'i-imli :i - 1 .. -1 . .> >l.-i t . • ■ ■ i ■ st.,| - with a founds- 

tiini ut' :t s iin-li nsbestoa slate. I effect the uniformity od •< possible in 

an incubatoi of the single well I heating units an placed betweei ro bottoms, tiki 
up per bottom being protected Pn th< diro< i heal oi the units by an ii 

heated by the units passes back h.-tui-eu the bottoms, up through Ihe - between 

double biiefc to the upper pari of the incubator, ami after circnlatir ba 

returns to the inter-bottom space bj w ol an o d the Front falsi bott 

Two Bhelves oi the grid tj provided which, by mea :. set at anv 
desired height. An innei permits u tion of the interior withoul cooling the 
contents. The incubator is mounted on :i jape d steel bate. 

Heating of the incubator is effected bj means ol out standard beating . which w 

manently connected to the switch contact springs. The heal regulating ui nitwits 

our bimetallic thermo regulator foi automatic control of the desired temj 

Temperature control is effected by means of our bimetallic thermo-regulator, which is made 
from invar-brass ribbon, and can be Bet at anj desired tcmperatu m thai of us 

surrounding atmosphere to tlu- n. a x i m.i n. heal capacity Ol the ineubah.r. aboul K - C. Thus 

range of temperature permits the use of these instruments as incubators, paraffins I or 
inactivation chambers. The precision of action of this thermo-regulator is ',"«'. The mas* 
aad-break contact of the thermo-regulator is located outside the ineul prevent the 

possibility of ignition of inflammable g developed in the inner ehaml srhen used as a 

paraffine oven, which often occurs when the contact is made and broken i \ pilot lamp 

on top of the incubator is connected in scries with the thermo-regulator, i sibling the operator 
t.. determine at a glance whether the incubator is regulating. These incubators .-an be ope* 

ated on either AC. „ u .r. circuits. C plete with receptacle, and 5 feel o .le ssbestes 

covered cord with separable attachment plug. 

No A B 

Height inside, inches ., jj 

Width inside, inches " jj 

Depth inside, inches <, 

Shelf space, square inches... n " m 

For volts ;~ 

Each 1M ■" 

- $75.00 75.00 

888 




n 



CENTRAL SCIEN TIFIC CO., CHICAGO, V. S. A. 



ELECTRIC INCUBATORS FOR STUDENT USE 



INCUBATORS 




No. 7908. 
Size No. 41 



No. 7908. 
Size No. 1. 



No. 7908. 
Size No. 33. 




Electro-Thermostat of No. 7908. 

INCUBATORS, Electric, Wood Frame, with clff.tr- thermostatic control. 

Construction: The walls are constructed of successive layers of truu.site, tar paper, animal hair, 
tar paper and five-ply wood, the latter consisting of quarter sawed oak over fibrous chestnut. 
The No. 1 Incubator, because of its small size, is sheathed with a solid wall of Quarter 
wed oak \t> inch in thickness. The others all have the five-ply construction. By this con- 
struction, excellent insulation is secured, without danger of warping under the influence of 
beat or capillary moisture from inside the incubating chamber. The doors are provided with 
glass for observaton of the contents, except in the larger sizes (Nos. 11-41), where an inner 
door of glass is provided with the entire outer door made of wood. The outer wall of quart*] 
sawed oak is finished in the natural color and highly polished. 

Heating is accomplished by means of incandescent carbon filament lamps, which heat quickly 
and cool quickly. The* sizes of these are selected according to the cubic contents to be 
heated. If specified when ordered, the incubators can be furnished with wire wound electric 
heaters with pilot lights* 

Ventilation is provided for bv means of two holes in the smaller sizes, one near the bottom 
through which cold air enters, the other at the top through which the warm air escape. In 
the larger sizes, there are four holes for entrance and escape of. air, and the lamps are pro- 
vided with ehimneys for the purpose of creating air currents. In this manner, a constant air 

current is maintained. 
Regulation of temperature is effected bv means of the electro-thermostat, which consists of a 
diaphragm of hard rubber and a metal disk riveted together. The difference in the expansion 
of the hard rubber and metal causes the former to become cup-shaped thus moving forward 



points in circuit with me lamps, um- «tn*'^« ^ *"~ r ; °,7- *u * «. n * n i-» VA A »* 

passing through the bridge across the thermostat, thus controlling the temperature. A cc 
i u g lumugu iur •„ +u„ Q i „.*,.;,. .nark between the contact points is quenched, pi 

denser is provided bv which the electric spaiK neiwwsu mk m « i , ? ni„nntp«] 

venting the points from being quickly used up. The thermostat and condenser are mounted 

on a transite base. 

299 




INCUBATORS 



CENTBAL » [BNTIFIC CO, VHU WO I * 



















7908, 
7000, 



7916, 



No 7916. 





7918. 



792o. 



No. 7918. No 7920. 

INCUBATORS. Electric. Wood Frame. Continued. 

Each ineubatoi is furnished eompleti with ol eonnectii rd and | or attachment 
i (i r 1 1 1 v lam 1 1 socket, Centigrade thermometer, and wire screen Bheh 

No 1 J II I J i .] 32 4i 

Height insid< . 

inches 9 26 12 15 50 10 .to j»". 

Width inside, 

inches ..... 7 18 ;' 12 18 ..; 20 18 20 

Depth inside, 

inches 7 18 9 lO'/i 18 Is is 18 18 18 

No, of Bheli es 1 1 1 1 4 i 

No. of lamps 1 2 2 2 _' 3 

Candle power 

of lamps 8 16 $ 8 16 16 16 16 16 

Doors single double - lllu u, duuM«- double, double double double double, double 

in 4h idled dn i led 

. , one di m in 

H W «>f stand, vil| ,,| „„,,.,,,. ,„„,,„,. 

" u ' ], r :■ 20 32 

Snipping weight, 

l,,s 15 1,r ' 22 AS 300 17:. 180 263 

l° T ion V0 \?' $ S'«S J 00 ' 00 400 ° 650 ° 2000 ° 225 - 00 125.00 112.50 240.00 137.50 
For 220 volts. 35.00 100.00 40.00 65.00 200.00 225.00 125.00 112.50 240.00 137.50 

F ",' (l , P w RArFINE 0VENS '"' «™ ostruction as No. rOOfl Incubators, see Paraffine Ovens 

on"- »,' . s ; l ':; , ''i El ? tr ? »«■»■» N, 13756 and condenser mounted I her 
socket Ti , ',""' i"" 1 '' 1 "- ^tached ready for connection to any UO-voll lamp 

not -V. ..- ZSSo »E " 1 l ' l; "- , " l l "" the bottom of an, incubating chambe. with a capaeitJ 

shouldberen i It , s ' , t kh v H** IS?" "' tlw """'•■•""«■ !■ "atei jack . the 
Weig«4aM upicdbvheat, .,,«., 

^Se? C w^t™p*ec?aT? candfe* £"2* "^ -"——'- - ^ 7916, but 

foer stat, protected from al ' i ,' -i l "\7% l "" UUU " ] "" : ' *f ""■ , ' " T "" h 

as for Xo. 7916. Heiehl of h- ,, i! " f - ' r:i,,s '" > - Method of installii i the same 

Complete with attachment tJd fSKfirg; uo'SS 1 """ h - * % LnCh68J VV,,i "'-' "i'h'O 

ELECTRIC HEATING DEVICE for 1- r , i 

descent l :u „i>s protected l.v i„..t..i -u- n " u,,: "" rs - consisting of two 16-candli mt ineaa- 
with attachment plug and cord r« /, I'"" "^ \\ mi Electro-Thermoatml No. 13756, wired together 
under Xo. 791.5. This emiinmenriS " ?' "" method "' Stalling ll ' »ame as given 

ing 8200 cubic inches in rJii , " T /' '"^ l " »»'»»>atin R .•hau.hen Q01 exceed- 

vol ts cumeai space. Weight packed for shipment, 12 pounds. For WO 

23.00 

300 



v£2b 




^ 




■l * . 





. 




-1 » 


- 


M 


11 

- 


I 

I 


16 


to* MM 






• 


. 


125.00 
1^00 


lliifl l»Mi 


mbtfer* 


i piriani* 


abator into u * 



n .• r"i 



• 



r. I- 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



TNCUBATORS 




7926 



7951 



7964 



Nos. 7926A-B. 



I f 

No. 7926E. 





No. 7951. 




No. 7926D. 




Nos. 7964A-B. 



ELECTRIC HEATING STOVES and UNITS for obvtrifying u .,. heated incubators. Th. -■ are 
for permanent installation and should be installed and wire. I by an experienced electrician. 
They should be used with Electro-Thermostat No. 13736 for temperature control, No8. A, M 
and C are mounted on transite base and protected by a perforated metal shield. No. E is in 
tended to be used with clips, such as are used for fuses. No. D can be attached by means of 
binding posts. All are wound for use on 110 volts. 

No A B D E 

Size of heater, inches 14x5x3% !».\:;- ; ,x;$ 8x% s^. 

Capacity, amperes %to3 %to3 Vi I to 1% 

Recommended use incubating large incuba- small sterilisers 

rooms tnrs incubators 

Each. $16.00 16.00 1.00 2.25 

INCUBATOR, Double Wall, round form, for use where only :i small Dumber of cultures is handled 
at a time. Made of polished copper with a 2-inch water jacket, covered with an insulating ma 

terial. Two covers are provided, the inner one of glass to permit inspection of th( LtsntS. 

Dimensions inside, 9 inches high by 8 inches diameter; outside, 12 inches high by IS inches 
diameter. Complete with water gag--, stop-cock for draining, perforate,! tray, gas burner and 

sheet iron base 9 inches high • 30.00 

INCUBATORS. Low Temperature. Thelco, Electrically Controlled, with walls composed of ten 
distinct layers of wood, porcelain, impervious sheeting, dead air spaces and wool felt. The 
outside covering is of porcelain, fused on steel, with aluminum trimmings around the doors, 
edges and corner. The Incubator contains two chambers, an upper for ice and a lower for 
the water-jacketed working compartment, each with its own outside door. The ice chamber 
is one-piece porcelain lined, and is equipped with a heavy galvanized ice rack. The capacity of 
this chamber is about 7.") pounds of iee. The electric heating element, or plate, covers the bot- 
tom of the lower chamber and is removable. This heating element can be depended upon to 

run indefinitely without attention. The working compartment is placed wit Inn the lower 
chamber directly on the heating element. It is a heavy triple-walled copper jacket, the space 
between the walls filled with water, and .he arrangement is such that while in use tin water 
,s in constant circulation. A const;,..- water level attachment is placed on the outside of the 
incubator so that water in the walls of the copper jacket is automatically kept at a constant 

The 6 bimetallic thermostat is located in the top of the working compartment and is regulated by 
means of a milled head screw from the outs.de. A pilot lamp md.cates when co„.a«- .* 
made and broken. The thermostat can be quickly and easily set to give any desired tem- 
perature between 10°C. and 40°C. 

The workine compartment is provided with a cushioned glass door to allow inspection of the 
■on tonts of the Chamber without exposure to the warm outer air. Complete with two adjust 
abl, selves adjustable ventilator, snap switch, and connecting cord and plug. ^ ^ 

No "" i in JBO 

For volts 395.00 395.00 

Each 

301 
















INOCULATING NEEDLES I 1 VKAL SCIENTIFIC OO, OMCAOO. P. a A. 




No. 8004. 



No. 800o. 




No. 7984 



No. 7990. 




7984. 

7986. 
799 

7992. 



1.20 



2E 



799 I. 



SIKH). 

801(1. 
8004. 
8 110. 

Mil'.'. 



No. 7992. 

INOCULATING NEEDLE, a platinum aeedli 40 mm Long, of No. 2fl wire, set in a glass handle 

8 inches loi S07 q 

10' ! discount in lots of 12, 20' , discount m lots of 144. 

INOCULATING NEEDLE. • as No. 7984, bul with SO nun ..1 So. 27 wire 

10', discount in lots of 12, 20' ; discount in lots of 144. 
inoculating needle HOLDER,., brass, nickelplated, with Bcreii chuck holdincBlU 

'■"J" 1 '"• '- 1 ' i*l ^'" '""" No. 28 i- v> 24 inclusive Length, 160 mm. Without wire" 

10'; discount in lots of 12. 20 discount in lots of 144. 
inoculating Needle Holder, Kolle Type, with rubber handle Tii, adjustabl chock permita 

u '"7 "' '"''• M ' '" 24 B. ,\ s. gage i. b clamped tightlj The , win B0 « 

overheat even during continuous use Length ovei all. m inches 7R 

10' . discount in lots of 12. 20' , discount' in lots of 144. 

Chromel Wire foi use with Woa 7990 and 7992, Ln J inch length 

No 

Per package of 10 

Per package of 100 

Platinum Wire for K*.s. 7«»!»" J ,| |„..".,i Platinum Ware 

INSECT BREEDING CAGE, of sine, glaaa front, with top, bottom and ride, of raw for 

ventilation. Top and bott .re removable. Size 5*xsUzlO inches hiel -Z 

^o^alvanized iron, water tight, for *ith N \> jj% to I '>'&'*£ 

INSECT NET, with collapsible steel frame iJi , , 80 ° 

handle 30 inches lone ' ' '""" v whl ' n -' '"" >"" ,i; '"' 1 



90 

.30 

2.70 



24 

.30 
2.70 



sn.'n. 



3.25 

pen 

00 

12 3 4 a 6 

■JJ -30 .30 .30 30 .30 .30 

■• i.UO 3.00 2.40 2.40 2.40 2 40 2.40 2-40 



msEOTPms. W ac, rt , ,..„..„ „.,,, « ., ilT >vitl , >h; „ | , ,.„„„;■„, |;||1 , J 

Per 100 ... ?J " 1 2 3 4 

T>»- Iftftn 40 .40 .Sfl 'II If. Oft o« 



8026 



Per 100 
Per 1000 

insect PINS, white, withround heads, in pa^eTof RJ 

i 2 3 4 5 6 

•28 .28 .28 .28 28 28 .28 

_ 2.25 2 25 2.25 225 2.2G 225 2.25 



Per 100 
Per 1000 
INSECT SPREADING BOARDS, for 



of two strips of hardwood . -i. ■■',:. 'i ?*! n! 7& in8ecta Pwpwtoiy to mounting. ' Consists 
of the insect is piace.l while the winoS ,,'. , : "";- ;1 ^'""^' "« the middle in which the body 
No - ,m pinned to the two strips. 

Length, inches ...'..] ■ \ C 

Width, inches " L6U 



Each 4-. 

ERVAL TIMER, B ee Clock Tr,^™,, 1.6C 



interval 



Clock. Interval. 



60 



7 T > 
2.00 



302 



' » ~ "*- 



■ I ' • -- — --^ ■ '-■■-.'.' • 





■ 

- 

• KftfktfaJ 

- 1 
* 

h 
I at 

■ 
o JO » * 

5 135 & ~J 

■ 

1J0 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A, 



JARS 



f ■ i' i"''*^ 

// 




1 i '1 





Nos. 8040-2. 



No. 8046 



No. 8054. 




No. 8062. 



Si»4'i. 



8042. 



8046. 



8054. 



S056. 



8062. 



JARS, ALL KINDS 

JARS, Anaerobic Culture, see Anaerobic Culture Apparatus. 
JARS, Animal, see Animal Holders. 
JARS, Aquarium, see Aquarium Jars. 
JARS, Battery, cylindrical form, of green glass. 

No A B C 

Diameter, inches 4 5 5 

Height, inches 5 7 g 

Capacity, quarts 1 2 4 

Each $0.35 .55 .75 

107 t discount in lots of 12. 

JARS, Battery, cylindrical form, of clear white glass, frequently used for aquaria ami specimen 



B 

100 

125 

1200 

.75 

48 



C 
123 

175 

2500 

1.10 

30 



D 

150 

200 

4000 

1.65 

12 



E 

225 
300 
14000 
4.00 

6 



work. No A 

Diameter, mm 100 

Height, mm 100 

Approx. capacity, ec 1 000 

Each 60 

15% discount in original case containing. . . 60 

For BATTERY JARS of other sizes and shapes, sec general heading Batteries. 
JARS, BeU Glass, see general heading Bell Jars. 
JARS, Chidlow's Gas Collection, see Flour Testing Apparatus. 
JARS. Chidlow Expansion, see Flour Testing Apparatus. 
JARS, Dressing, with loosely fitting knobbed cover. 

No ' A C 

Height outside without lid, mm 100 150 

Diameter outside, mm 100 150 

Each 1.10 2.40 

107, discount in lots of 12. 

JARS, Hydrometer, see Cylinders. 

JARS, Leyden, see Catalog F of Physical Apparatus. 

JARS, Mouse, see Animal Jars. 

JARS, Museum, or Specimen, of clear white glass, with diameter of mouth same as that ol 

body. With glass lid with rings for- suspending specimens, rubber gasket for sealing, and 

metal clamp for fastening lid. 

No A 

Height, without lid, inches 4 

Diam. inside, inches - ! 1 



Capacity, pints 

Each 

33i£% discount in case containing . 



1.18 

144 



C 
8 

1 

1.30 

72 



E 
6 

1% 

1.70 

H 



F 
8 

■'•'.• 

2% 

1.85 

48 



G 
12 

•;'-■ 

4 

2.20 

24 



J 

8 

.1 

.'!.. 

3.35 

2 1 



K 

12 

5 

8 

4.00 

12 



M 

!■< 

5 

12 

4.50 

12 



No. 



N 

8 

8 

4.30 

12 



B 

8 
7% 

12 
6.60 

12 



S 
12 

7 : >u 

18 

7.50 

6 



D 

18 
7% 

28 
8.75 

6 



V 

24 

7% 

36 

1C.00 

6 



X 

12 

11% 

:;s 

15.75 
2 



Y 

18 
11' • 

58 
19.75 

2 



2V 4 
.05 



3VJ 
.18 



5 

.40 



.55 



.90 



11' . 
2 00 



Height, without lid, inches 

Diam. inside, inches 

Capacity, pints 

Each 

33i£% discount in case containing. . . 
Rubber' Gaskets only for No. 8054. 

Diameter, inches 

JAr! 3 Museum or Specimen; "of' "clear' white" glass," wide mouth, with gl,^ *M'P^ nftdlj 
ground in to make air tight seal. Sizes from 4 to K are earned in stock, other sizes will b. 

furnished on short notice. 

No A 

Diameter of body, inches 1 ' -■ 

Height to shoulder, inches 2 

Diameter of mouth, inches 1% 

Height to top of stopper, inches ■"■'_• 

Capacity, ounces *» 

Each * 50 



B 

1% 
3 

1% 

4'- 

2V> 
.55 



C 

2 

4' •:. 
.56 



D 
2 

3% 

l'-2 
51/2 

5 
.60 



E 
2 
5 

IV, 

6% 
7 
.68 



F 

3 ' ■• 
2 

7 

8 
.70 



G 

5 
2 
7 

12 
.80 



H 

2 ' • 
7 
2 
9 

16 
.85 



J 
3 

4 

2% 

6V 4 

12 

.90 



K 

3 

6 
2% 

m 

20 

1.10 



H% discount to lots of 12, 30* discount in lots 

303 



of 144. 









JARS 



, | , li;vl . g 111 n I 0., ■ HII \<0, U. 8. A. 










No. 8074. 



No. 8078 



No. 8090. 



No. 8086 



No. 8092. 














JARS. Nessler. » Colorinietnc Apparatus. 

Sn74. JARS. Precipitating, oi heavj glass with lip. 

Capacity, pinti 1 2 i 8 24 

Each 80.40 .60 .80 1.75 2.35 4.00 7.75 

10 I discount in lots of 12. 

JARS. Preparation, with glass cover*, bm Dishes. Preparation 
JARS. Sample. Screw-cap, Be« Bottles, Sample. 

S078. JARS. Sample, glass, with metal s cap; valuable foi samples, etc 

Capacity, ounces .... 2 8 

Per dozen .. .90 120 1.60 

10' discount in lots of 144. 

8086. JARS. Specie. o£ glass with nu-tal .,,«., t. for collecting gases, -1 \ chemieali 

Capacity, quarts 1 4 

Each 50 .60 1.00 

10', discount in lots of 12. 

stum jars. Specimen, of glass, with knohh.ni eovei I Ij fitting Knob is sunk to penail itaefc 

ing of jars. 

No ^ I , ( , j , j.. 

Hei S ht « inehes 2% 3% 5 6 :•: 

Diameter of top, inches 6% 6% 8Vj g44 ll% 

Diameter of bottom, inches ,-,.-•., 7 y, 334 

Capacity, pints 2 ,, ( .~ 9 16 

EaCh 50 .60 1.20 1.70 3.20 

10' , discount in case containing ; . ( ; 2 8 12 9 

8092 JARS. Specimen, of glass, with s lass iv ided with ground ,,„. for Bealing. 

'°: * : * \ b c d 

Height outside, inches „ 

p mmot " "* u,h ' Lnchea 3* 4% 5% m 

< apanty, quarts 

Each - 4 

30 .75 1.30 235 

10 ; discount in lots of 12. 

1} 



I KXTHAL SCIENTI FIC CO, CHICAGO, I . s A. 






1 



- 



IB 






... 



JARS 






No. 8094. 



No. 8096. 




No. 8098. 



No. 8100. 





No. 8104. 



No. 8106. 



8094. 



80%. 



Nll!.^ 



Sill. I 



B 


: I 




** 


' I 

Mi ft 1 
1 


81H4. 

81(iii. 


m 


i \ 

UJ 131 * 


8112. 




1 




r« for 


1 

■ 




JO 


1 

ft 1 


8114. 
8120. 





No. 8112. NOi 811i 

JARS, Specimen, of dear glass with cover, clamping device and rabber gasket. 

No. ... • \ B (' D E 

Height, inches 2V 2 3& ' :i . 5% 4% 

Diameter, inches 2% 3 3V6 3% 4V4 

Capacity, ounces 4 , 8 !> 14 23 

Each $0.20 .25 .30 .35 .55 

107c discount in lots of 12. 
JARS, Specimen, Calcutt's, made entirely of glass, so there is no danger of corrosion. A half 
turn of the cover renders the jar air tight. 

Capaety, pints 1 2 

Each .60 .70 

Per dozen G.00 7.00 

JARS, Specimen, Inverted Show, see Bottles, In7erted Show. 

JARS, Specimen, Mason's Fruit, with screw-lids and rubber gaskets for sealing. 

size, quarts *A 

Per dozen 1.40 1.60 

10% discount in lots of 144. 
JARS, Specimen, Sure Seal, with glass cover, metal clamping device and rubber gaskets. 

Size, quarts * ' -r 1 

Per dozen 2.00 2-20 

10% discount in lots of 144. 

JARS, Staining, Coplin's, for ten 3xl-inch slides, with glass lid each .35 

10% discount in lots of 12, 207r discount in lots of 144. 
JAR, Staining, Naples, of clear glass, with loosely fitting hemispherical cover. Height, 90 mm; 

diameter, 35 mm t *I" i 

JARS, Stoneware, with handles and rovers for storing ordinary chemicals. Preferable to a gal- 
vanized iron can for refuse. Capacity, gallons 1 » J> 

Kameter, inches »% J% " , 10 

Height inches ° ' 1U - l 

Each 75 115 200 30 ° 

Note:— Owing to' the'hi'gh 'cost' of 'boxing' (charged by us at cost) and transportation on stone- 
ware jars, we recommend that they In- purchased from a local merchant who is able to mini- 
mize these costs bv carload purchases. . 
JARS, Stoneware, with cover and nickel-plated metal stop-cock tor storing .1. stilled water, etc. 

rapacity, gallons ; 5 ^ 800 950 

Each • 

Note:— Boxing will be charged on No. 8114 at cost. 

JARS, Tumblers, Jelly, with cover, 2f»u <•■• apacitj P er aozeu 

10% discount in lots of 144. 

305 






KETTLES 



, | n11; m » OENTOTC 00., CHICAGO. P. a A 







No. 8142. 




No. 8148. 




No. 8146. 








No. 8150. 




No. F6065. 



201 







201 




No. 8160. 



No. 8160. 



mr:. 



siTio 



4 

9L30 



BU6. 

8143. 
8150. 

roitfi.-,. 



KETTLES. Infusion, double boiler, of graniteware, with tin r. 

Manufa< tun i 'a rated - apa< itj of inm i k< 1 1 le, quai ts 
Each 

KNIFE, t'.u glass cutting, Bee Glass Tubing Cutters. 
KNIFE, tor mixing .1. mi t^li . s.-r No. ."'.»,>> 

KNIFE. Laboratory, g ,,... I steel bis i inches long; round wo«..l handle. Useful for cutting 
corks, etc, 25 

KNIFE, Pocket, one blade, excellent quality steel, iron lined a handle, Unch 1-00 

**ii!!3 ^ oc ( ket - ,w " bladea crocus poliahed, iron lined, itaa handle, 1-inch. \ celled alt 



F6069. 
8160. 




ipietewita 100 sheets of gummed glazed paper 90-00 

2£f? : : ,,,1 «"■■*• , '" 1 »- ■*« *• P6065. Sine, 15x48 cm. Per 100 sheets 2.00 

LABELS. Denmson's Gummed „ M , ul:u . .,„. „„„ ,.,„, ^ 

Length! 'nun' 2? 52 5 209 813 - 17 219 823 259 Ml 

Width, nun S 4L :7 30 L> 7 38 21 33 52 

Per box " ,' 28 24 20 l'.» 17 14 14 

Per carton of 12' boxes inn A 10 10 10 1( > 10 10 10 

xes 10 ° i-oo 1.00 1.00 1.00 1.00 1.00 1.00 1.00 

306 



I 
■ 





8164. 




M.Wi. 



817.'. 




•'.- 



SI 7n. 



817v 






■::. 



CENTRAL SC IENTIFIC CO., CHICAGO, U. S. A. 



LABELS 




No. 8164. 




No. 8166. 



No. 8176. 




POTASS. CHROMIUM SULPHATE 



CHROME ALUM. 

K 2 Cr 2 (S0 4 )4 + 24H 2 0. 



No. 8178. 



No. 8172. 




2:? 9 


24] 


27 


21 


17 


14 


.10 


.10 


1.00 


1.00 


txes 


o£ 100. 




L'rtOT 



No. 8194A. 



LABELS, Dennison's Gummed, oval shape with red border. No 229 

Length, mm ^-> 

Width, mm 30 

Per box 50.10 

Per carton of 12 boxes 2.00 

LABELS, Dennison's Gummed, rectangular shape, large size, with red border, in boxes 

No 2001 2003 2004 2005 

si ze, inches 1 M.»x3% 2x4% \x2\ 1". x4 1 "\ \2% 

Per box .20 .30 .15 .25 .15 

Per carton of 10 boxes 2.00 3.00 1.50 2.50 1.50 

LABEL BOOK, containing labels for the most used chemicals and reagents, each label bavins 
name and symbol. Gummed, perforated, and arranged so that they may be easily removed 
without destroying the book. (Labels should be covered with melted paraffin* after being put 

on the bottle, to protect them from acids, etc.) Book contains about 500 labels 50 

LABELS, Gummed, Microscope Slide, of white paper with light border, 22 mm square, in 

boxes of 100 per box .10 

10% discount in lots of 10 boxes, 20% discount in lots of 100 boxes. 
LABELS, Gummed, Microscope Slide, same as No. 8176, but rectangular, 22x15 mm, in boxes 

.10 



.25 
.30 



SB 






orut Mfl.hV, 4-*i 

ii<i ii«*| 






mi Pf" 

- 



L *- 






of loo per box 

107c discount in lots of 10 boxes, 20%, discount in lots of 100 boxes. 
8190. LACQUER, Colorless, for preserving polished metal surfaces. In ounce bottles per ounce 

8192. LACQUER, Gold, in 1 ounce bottles per ounce 

LACQUER BRUSH, see Brush, Lacquer. 
LACTOMETERS, see Hydrometers. 
8194A. LADLE, of wrought iron with handle and lip. Useful for fusing metals. Diameter, J 1 ., in. 
LAMPS, Alcohol, see general heading Burners. 
LAMPS, Microscope, see Microscope Accessories. 

LAMPS, INCANDESCENT 

In selecting incandescent lamps from those listed below, attention should be paid to the fact that 
the consumption of carbon filament lamps is approximately 3 watts per candle power, while that ot 
tungsten filament lamps is approximately 1% watts per caudle power. 

8196. LAMPS, Incandescent, Miniature, tungsten fihment, threaded base to fit No. 5124 Receptacle. 

No 'l 

' a mile power "" ' " ., , 

Voltage "25 

Each 

8197. LAMP 

Reg 

era and wassermann ±*atus. wjiain.*, u.i w-j — » --■ 50 

Noler-ft'or^ 

number which will be found on the nam." plate r p„ pn ticie<i and sockets 

8198. LAMPS, Incandescent, tungsten filament, Edfeon base to fit all Edison receptacles ami sockets. 

,. _ ^ 

N 4 

Candle power 6 



c 

4 

•■■ 
.40 




Voltage 
Each . . 



t a • • • 



**•••• • 



A 


B 


4 


6 


6 


8 


.75 


.85 



* ■ ■ • • 



:'.n7 



LAMPS 






,, vi.ik ca, i in- ^0. p- 






J. 





No. 8U0U. 



No. B202, 



No. 8211. 



No. k 



No. 8214. 



819 



g LAMPS, Incandescent, tungsten lib t. f« ■ Othei than - ^ 



• • • 



SOTS 



.75 



.75 



25 

.75 



E 
.75 



I 

16 

25 



B 
.35 



iO 



Voltage 

Wattage 

Each 

ml-.i.i. LAMPS. Incandescent, .art.,,,, til at, 110-volt, Bdiaon base to ill Bdiaon tacle. and 

Sorki t- NO 

< 'andle powei 

Each 

8202. LAMPS, Incandescent, tungsten filament. 110-voIt, Edison ba* to Bl all I I ties and 

1. »« V 

sockets, wo 

Wattfl 

Each 

820* LAMPS. Incandescent, tungsten filament! nitri filled, 110-volt, I to fit all Ellison 

receptacles and sockets. No ■ • 

Watts 

Each :::::::: "* 

m'imi. LAMPS. Incandescent, colored glass, carbon fib vnt, 110 volt; natural eolo it dipped; 16c. p., 

Edison base to fit all Edison ree< ptacl - an is, 

.... H * ' ' 

i.i rreen rubi 

.60 .80 



.45 



45 



WO. . 

Color 

Each 



*'_'iiK. LAMP. Pocket Flash, for use in store rooms. \ ulei "■ nickel i I I trimminj 
si , . 1 1 _.\t;i ._. inches, with tungsten bulb and batter) - - 1/0 

8209. Battery I'm \",, s-jus, fur replacement - 3o 

B210. Incandescent Bulb for No. 8208, foi replacement ^ 

8211. LAMP, Standard Incandescent. •■:ii'i H»i filament, appi lately 11" volts, 16 i p., 64 watts, foi 

stationary use. With certificate of candle power from the Electrical Testiin iboratoi 

A i ■■ wv.tr v of rating, *4% 

8212. LAMPS, Standard Incandescent, tunj n filament of Bpecial cunstrvi. i ><>,, •■ bviate variable 

cooling of filament when it touches it- anchor wires, Mure satisfactory a- li^hi ■ inlards 
than carl. mi filamenl lamps. With certificate of candle j>. m the Electrical Testing 

Laboratories, lecuracj of rating, ',,,%. In ordering, spei th< ■«. <*1t :i i; ch the lamp 

should be standardised, This maj i« between LOO and 130 volts. Poi stationary ase 



No. 

Watts 

Each 



\ 


B 


c 


25 


w 


.-,11 


9.00 


00 


9.00 



huh. LAMP. DAVY'S SAFETY, as used in mines Height, about 25 cm 
LANTERNS, Projecting, Bee Catalog F of Physical Apparatus. 
LEAD FOIL, see Catalog R of Chemical Apparatus, 

8216. lead SHOT foi cleaning bottles, etc. 
Size No 

Per pound 

Per 5 pounds . . .95 

P2857. LEATHER BELTING. Round. 

Diameter, inches 

Per foot 



LOO 



. . . ■ 



6 


8 


11 


.25 


.25 


.25 


.85 


.85 


85 


\ 


W 


•V. 


.10 


.12 


.20 






GJf« 



tw 



I 



^^vw 






ANTRAL SCIENTIFIC CO., CHICAGO. U. S. A 



LECTURE APP, 






5 X 













No. 8220. 



No. 8222. 



No. 8234. 



No. 8254, 



No. 8268. 



- 



'-■■■■. 



*i 



B 



■ ■ 
• - 



.■ 






. 


. tW 
















• 




9?00 


m 



I 

10 



! 

r 






LECTURE APPARATUS 

8220. LECTURE APPARATUS, for Electrolytic Decomposition of Water, simple form with sliding 
graduated tubes and removable carbon electrodes $3.00 

8222. LECTURE APPARATUS for Electrolysis of Water, improved form, with platinum electrodes 
that inav easilv be renlaced bv cooDer electrodes or bv carbon electrodes for electrolysis ot 

■t v * w * £ *■' 

hydrochloric acid. (See Nos. 8238 and 8239.) Complete with support 7.25 

8224. Glass Parts only of No. 8222, without electrodes. (See Nos. 8238-8240) 2.00 

8234. LECTURE APPARATUS, Hoffman's Improved Form, for decomposition of water, with gradu- 
ated tubes, glass stop-cocks and removable platinum electrodes, complete with support. 15.00 

B236. Glass Parts only for No. 8234 without electrodes. (Sec Nos. 8238-8240) 10.00 

8238. Carbon Electrodes for use with Nos. 8220, 8222, 8234 and 8268, consisting of two rubber stop 
pers fitted with carbon electrodes -°0 

&23i>. Copper Electrodes, same as No. 8238, but with copper instead of carbon electrodes 50 

8240. Platinum Electrodes, same as No. 8238, but with platinum instead of carbon electrodes. . 1.75 

8242. Support Stand only for Nos. «222 and 8234 with binding posts 3.50 

82.14. LECTURE APPARATUS, Hoffman's Eudiometer, with platinum electrodes, two stop-cockfl, and 
graduated arm. Complete with support 

8255. Glass Parts only of No. 8254, with platinum electrodes sealed in 10-00 

8268. LECTURE APPARATUS. Osborne's Porm, tor electrolysis of water and for study of conduc- 
tivity of liuuids. ionization, electro-plating and electrolysis of water. A simple, substantial 
form of electrolytic apparatus that can be used to demonstrate the principles involved in the 
theory of electrolytic dissociation. It consists of an outer U tube With graduated sliding 
tubes, shot valves, glass plug and platinum electrodes, which are easily replaced by carbon 
or copper electrodes (Nos. 8238 to 8240). It allows immediate change of liquids, permits the 
introduction of an indicator, cloth for bleaching, is readily cleaned, requires I"*--"* * 
liquids to fill it. Complete as illustrated, on support with binding posts. ^wMteHte 
use 

8268A. Glass Parts only of No. 8268, without electrodes. ( See Nos. 8238-8240) 

4.00 

8270. Support Stand only for No. 8268 

309 







LEVELS 



0BNTBA1 BCJBKTiriC CO., CHI CAGO, U.ftA. 





No. 816. 



No. 8-284 





No. 8292. 



No. 8288. 









No. 8294. 



No. 8290. 






No. 8296. 



No F261. 



No. 8306. 



8276 



8284. 

8288. 

8290. 

8292. 

8294. 
816. 

B296. 
P261. 

8306. 



LENS PAPER. Japanese. for . Ii a ni ises, mi Bheets 7\ii inches, in pad ion sh»vts 
Per package $0.40 

LENSES, Magnifying, si i Magnihers. 

LETTERS. Steel. Bee Dies. 

LEVELING BULBS, see No. 1902. 

LEVEL. Bench. Adjustable, with handle and tecuratelj graduated vial. Length, 4 inches; handle 
and tube nickeled, baso japanned 3.60 

LEVEL. Mechanics', Iron, 12 inches long, ground face and ends, japanned bodv, .louble plumb 
,* '. 3.30 

level, Mechanics', Wood, ordinary type; 10 to 16 Inches long. Oval top plati . two side views 

LEVEL, Pocket, Brass, ground flat on the bas . nickel plated: 2 inches lone. Very useful in mak 
ing apparatus .45 

LEVEL, Pocket, Iron, japanned, •■ 1 , inches 1 mg -23 

Level, Round, in brass case, for balanci cases, drying ovena, incubators, etc. Diameter, 2.5 ea- 

... 6.00 

f^Z5? , ; Round ' "Which Way," of steel, nickel plated. Diameter, .'.'.7.7 100 

\i7. i . SCREW S. in seta of throe, permitting the rapid leveling of board or glass pli 
t : .!. 5? e } y \1 . m . eta1 ' the btts « "'' which is accurately planed. Base iaoann. screw whits 



t«^ ' HtMyht ' '- 5 cm: raa B e "'" adjustment, L3 a\m '. per set 3.00 

LIBRARY paste, best wade. 

No A B 

Each • - •' Collapsible Tube BOu ' 'P Jar 

.15 -20 



310 



k. 



•' :- . 



OECTBAL SCIENTIFI C co,. c HI cago, L , s _ A _ 




LIQUID AIR APP 



No. 8320 (Shown With Nos. 8321 
and 8322). 




Diagram Showing 
Internal Construction. 



832U. 



N • • 



■ pehfitt 



LIQUID ATR, Apparatus for Producing. Many interesting experiments that can be perform .1 
with the liquefied pwes^ (so-called permanent gases), have not been possible in most lab", 




not been possible in more than a very few laboratories. 

In using this apparatus, the simplest plan for the ordinary laboratory is to purchase a steel drum 
• ntaining air or oxygen at approximately 200 atmospheres pressure. The gas so purchased 
is free from moisture and carbon dioxide. The liquifying unit is coupled to the steel drum by 
means of a standard coupling. The whole unit is shown diagramatically in the illustration. 
\ Dewar flask, which may be unsilvered if the actual production of the liquid is to be visible, 
is slipped over the copper tubing and is supported by a rubber sleeve, which also renders the 
connection gas tight. Gas entering the tubing at 200 atmospheres travel* indicated until it 
reaches the needle valve at the lower end of the coil. There expansion takes place and the 
expanded gas flows upward around the tubing, cooling the latter and escaping at the OUtlel Y, 
For greater efficiency, the upper vessel B may be filled with a freezing mixture. Cooling is 
progressive and if oxygen is used the liquid begins to form after three to four minutes. The 
needle valve is operated by means of the handle Z, which protrudes above the cooling vessel. 
Approximately one-half liter per hour can be obtained so that in the coarse «»f one or t 
hours enough of the liquid oxygen or air can be accumulated for most of the well known 
periments 590.00 

8321. Dewar Tube, for use with No. 8320, special form with mirror removed from a strip down 

the side to permit observation of the process of liquefaction. A thermocouple is sealed in the 
tube, which when connected to No. 8322 Pyrometer listed below, enables the temperature of 
the contents to be noted 15.00 

8322. Pyrometer, for use with Nos. 8320 and 8321. With scale reading from 20° to —200° C. 40.00 



CENCO CERTIFIED CHEMICALS 

CATALOG R of Chemicals contains a complete list of all reagent and commercial chemicals 
used iii laboratorv work. In addition it lists a complete line of bacteriological stains and re- 
agents, indicators for H-ion work, rare sugars and mineral specimens. It is a complete alpha- 
betical index of laboratory chemicals. In accordance with our custom on all laboratory supplies, 
these chemicals are carried in stock in large quantities for immediate shipm ent 

We invite special attention to our line of CENCO CERTIFIED CHEMICALS, which are 
analyzed in our own laboratorv and upon wdiich definite limits of impurities have been estab- 
lished, with which all chemicals sent out are guaranteed to conform. These limits of impurities 
are contained in our Bulletin No. 101, a copy of which, together with CATALOG R, will be sent 
once upon request. 



311 














MAGNIFIERS 



,, vn;vl BCIENTIPIC CO., CHICAGO, B V 







No. s:»J 



No. 8343. 



No. h.;n. 



No. 8346B 





No. 8348 



No. 8350. 




s:u:: 



8344. 



No. 8356. \J | 

MAGNIFIERS 

8342. MAGNIFIERS. Doublet, consisting two plant uvea lenai i ■ metal mount, foi i ith«r 
as :i hand magnifier oi in dissecting microscopes 

No \ B 

Magui t'\ ing po^ ei . diameters ........ fl \> 

Fo< -I distant i . mm 4 ' J.% 

Working distance, mm 22 

Diam< tei real Bold, mm .... 22 n 

Each $1.75 1 75 L75 

MAGNIFIERS. Doublet, consisting Di two piano lenses mounted folding pocket ase 

No. .... \ fi C 

Magnifying power, diameters .... 6 19 

Pocal distance, mm 4 ] 

Working distance, mm 22 

Diameter real field, mm . . 22 

Eacn 2.00 2 00 2.00 

Note:— 10', discount to educational institutions from list prices of No.s. 8342 and 8343. 

MAGNIFIER. Counting Glass, foi use 1 anting colonies oi bacteria in the Koch method for 

water and milk. This glass meets the specifications of the American Publii Health i- 
tion. Magnification, ■, See Standard N tods of Bacteriological Analvsis of Wai ind 
Milk, c.t the A. P. H. A.) ^03 

MAGNIFIER Linen Tester, .-xi. -n.u.h used tarj bioiogy work! and 

P; 1 ?. 08 * 1 !" ' a smaU compact magnifiei is desired. Folds up into ven small space. Magnifies 

10 diamete rs. Diameter of opening, '•■ Lush ... ' 50 

MAGNIFIERS. Pocket. In folding mount of rubber, i,.|,, an irabl' 

No ^ g 

Diameter of lens, nun ......... \ s 

Magnify Lng p.. wit. diami ters..... - -i -, 

Each •' g. 

MAONIFIBR8, Pockety same as No. 8348, bnt with doubll iens." 

-^ ° . D 

Diameter of lenses, mm ' , rt .>- > n 

Magnifying, r/diameter* . ! - 

Each ' - 

MAGNIFIERS; Pocket.. ... v.. . ,„„„,„, „,„,:,.,/ 85 ** 

Diameter of lenses, mm 1- is 

Magnifying power, diameters '" vSn 

Each ... • ■' 

SUB. MAGNIFIERS. Heading "oi^ „,„, „,MM ™ ;,,,.nv, ,,,,,' ,,, „,„,,, 5» 

Diameter of lens, inches V |: ' '! 

Focus, inches .... -' 2% * 

Each .... 5 6 "' 

80 1.00 1.20 2.00 

312 



fcoiC.B 



8318. 



8350 



8352 






^H 







f 

41.1 



• 









- 

• 

« 

J 
*m D42UIH 




8360. 
8361. 

8364. 






8366. 


1 
1 


8368. 
8372. 


> 




8378. 


* 


' 


8382. 


i 

* 

- 

* 


1 

1 
1 

.-i 


8386. 
8391. 




1 


8394. 


f 

.1 :- 


1 

J 1 

1 


8396. 
8397. 



^^^J^™^^^^^^ s. a. 



MAGNIFIERS 




No. 8360. 





No. 8361. 



No. 8364. 





No. 8366. 



No. 8368. 





No. 8386 




No. 8391. 




Nos. 8394-6 



No. 8378. 



MAGNIFIERS, Triple Aplanat, the highest type of hand or dissecting magnifier. They are 
perfectly achromatic ami free from distortion, have an extra long working distance, and 

furnish an unusually large, flat field. 

No. ..... A B 

Magnifying power, diameters :» 1 2 

Focal distance, mm 27.8 20.8 

Working distance, mm 24.5 18.4 

Diameter real field, mm I'm i , 

Mounted for use in dissecting microscopes S4.75 4.75 

Mounted in folding case for hand use 5.00 5.00 

10% discount to educational institutions from list prices of Nos. 8360 and 8361. 
MAGNIFIER, Tripod, giving a large, clear field and sufficient magnifying power for elementary 
botanical and zoological studies. The lens is focused by screwing uj» or doWB in the metal 
frame , 80 

MAGNIFIER, Watchmakers' Glass, double convex lens in vulcanite mounting. Piano t. t, _'■" 

mm; magni fying power, 3 to 5 diameters 90 

MAGNIFIER, Watchmakers' Glass, consisting of two lenses of 1- and 25 mm diameter. The 

front lens (12 mm) can be removed by unscrewing, thus permitting the use of the real lens 

25 mm). Magnifying powers, 4 and 7 diameters 1-50 

MAILING TUBES, heavy pasteboard, l%x!2 inches Per dozen .35 

For other MAILING TUBES, see No*. ">988 and 5989 Sample Mailing Cases. 

MALLET, Wood, round, .Much face 45 

MANOMETERS, see Gages. 

MATCHES, Swedish Safety, in packages of 12 boxes Per package .16 

Per 12 packages 1.70 

MATRASSES, see Blowpipe Apparatus. 

MAUL, of iron, with wooden face and hickory handle. Length of handle. S feet; diameter of 

head, 3% inches; weight. (5 pounds 1B0 

MEASURES, Calipers, see Calipers. 

MEASURES, Dry, Galvanized Iron, with reinforced rim. Set of 5 pieces. 1, L> and 4 quarts, 1 

peck and '-. bushel 3,?0 

MEASURES, Liquid, Polished Copper, tinned insblr. with spout and handle. 

Capacty, pints . . . .. ... •■ •• • • •• • ■ ■ ■ ■• ■ ; ■ ■• • ^ 2 ' 5 ^ 

MEASURES, Liquid, Tinned Iron, with spout and handle. g 

Eacn l ' ity ' 1,intS '.'.'.'.'.'.'.'■'. -20 -22 .25 -30 .50 

MEASURER Liquid, Tinned Iron!' Set' of " -V j.i Ices, consisting of each of those I -d under 

No. 8396 

313 










METALLOGRAPHIC APP. « «AL SCIENTIFIC 00, CHICAQO, XT. BJL 




No. 8411 





Nos. 8400-2. 



No. 8450. 



- 



M< 



1 
1.30 



Ml 1. 



5162, 



84.1»i 



MEASURES. Liquid. Metric, polished brmi m. 

Capacity, I "I 0.1 0.1 0.:' o 

Each ... $0.40 .50 .56 .60 .80 1.20 

MEASURES. Liquid, Metric. Sam. :i> N<>. 8400. Bel of K | [iter j^ 

Note: -"Standard Form ' is thai in which 1 1 j « ■ iiametei equals ball th< height. 

MEASURES. Metric Rules, see Scales. 

MEASURING MICROSCOPE. Bee Microscope*. 

MECHANICAL STAGE. sec Microscope Accessories. 

MELTING POINT TUBES. Thielc, modified by Denni I'm, n glass i in 

MERCURY BULBS. -■ So. 1""-' 

METABOLISM APPARATUS. see i 

METALLOGRAPHIC APPARATUS 

BLAST. Hot Air for drying freshly polished Bpecimi sec N o 1388 

DESICCATOR CABINET for storing polished specimens, 

FURNACES for heat treating. - heading Furnaces. 

EMERY PAPERS. Metallography French grade, special!) prepared foi Ketallographic purpoi 

Per sheet ,„, A6 . * 

Per nnirp - 06 ° • -05 .05 .Oo 

x-er quire , ,,« « „- - „- ... 

G ™etS s^ofen^T' T ""^ W '* re ^**n,. *» £^2* Poush 
ing metal specimens. 1 1„ machine consists ol two wheels ol carborundum inding, 



845 1 




8452. 

8454 

84."". 

84S)M 



GRINDING AND POLISHING MACHINE Wv nr ?"' 

base with % I., p. mSoT^ MAC «INE Wy,or. -.,,„, a. i.„, a ,,,., ir „„ 

No 

A B ( D 

For volts A.C. I U 

Each "" 220 11 

W ' * ' " *: 130.00 132.50 122.50 125.00 

Extra Polishing Cto^Tottf'*"* **' '" ^ 8450 " 845L 

Grinding Wheel. Carborundum, (w/ 6 " inches uiamVter,' :;,„,, ^/^ .„ ,, h* 

Grinding Wheel, Carborundum Medium" V " ■ ' ' i " ' ",•' 3-25 

m ' Medlum ' b ""■I— .hmu-t.-r. n s i„,|, thick, with '• inch hole. 

Grinding Wheel, Carborundum Fine ' , : ;, " i " ' ","• 2,5 ° 

' ne ' B ""• ,l "^ foameter, % ,,„•!, thick, with '■ inch hole. 

HARDNESS TESTING APPARATUS \ ^ 

LEVIGATED ALUMINA for usT^f'xr "'""•'' '" " lln - Harass Testers. 
r «pid finish; in powder form ' ' s i'"' l:,lh prepared for obtaining a correct and 

No 

For use with' .'.'.'.['.'.'.', ['.'.][[' A B C 

steel and hard medium hard rft 

Per ounce metals metals m 

1.00 1.40 1.80 

314 






u 




* u 



MI'S 






I « J6 i 

; o u u 
— I-: hipMfcri 






B 

m ia» 






BJ 



I M 



unihrtk.^ 



■ 
B 



>4kH ■*£, 






u- 



ok 

.00 



U 






B500. 



CENTRAL SCIENTIFIC CO., CHICAGO TT R a »«.«. 

_ ' ^"" A(, °' U - s - A, METALLOGRAPHIC APP 



METALLOGRAPHIC APPARATUS, Continued. 




No. 8500. 

METALLOGRAPHIC OUTFIT, Bausch and Lomb LA7-FSMT9, a very convenient apparatus for 
im-tallographic work, as one can look down through the microscope iu the regular wa\ when 
visually examining the specimen, and then, by sliding in the supplementary draw tube, ran 
a use the image to be projected into the camera ground glass. The camera may be need in a 
vertical position if desired, in which case the microscope base plate would be plaeed parallel 
with the optical bed and the side tube used for direct observation. Tin- outfit is equipped '"» 
use with high-power objectives for magnifications from 24 to .jOO (at minimum bellows exten- 
sion). 

Note: — Arc illumination is recommended for general metallurgical work inasmuch as it pro- 
duces the greatest light intensity. Since the arc is not satisfactory on A,C. circuits on account 
of its tendency to flicker, the Tungsarc lamp is recommended for general work, although it 
necessitates about six times the exposure of the carbon arc- The Tungsarc may be obtain. <l 
with controlling resistance for 110 volts D.C, or with special rectifier for lln \olts A.C. For 
use at low and medium magnifications, up to bOOx (8 mm objective), the (5 volt. 18 ampere, 
108-watt Mazda lamp is recommended, and may be obtained with transformer for A.C, cir- 
cuits and with resistance for D.C. circuits. 

Specifications. 
Microscope FSMT9. Designed especially for use in metallography. Equipped with supplement- 
ary tube which contains a sliding inner tube Sited with a 90° prism so that when this is 
pushed into position the beam of light is intercepted and directed in a horizontal direction. 
Because of this arrangement, the object may be observed directly through the microscope, 
while for photographing, the use of a horizontal camera is made possible. Supplied with 32, 
16 and 4 nun objectives, two each 6.4x and lOx eyepieces, vertical illuminator and mechanical 

stage. 

Illuminating System. Consists of a 4% ampere, 90° hand feed arc lamp with rheostat for 110 
volts; aapheric condenser; support for ray filter; one ground glass, one blue glass and one 
green glass filter; and a supplementary condenser with iris diaphragm and light shield, on ad- 
justable support, to work in conjunction with aspheric condenser and vertical illuminator. 

Supporting Stand. Of cast iron; feet of stand have lateral spread of 85 inches top plate, can 
ing camera bed and optical bed for illuminating accessories and microscope plate is 45x7% 
inches and :J9 inches from the floor; shelf, 12x15 inches, is mounted between the standards 

for holding accessories. . . . ,. . - j * 

Camera. Optical bed 25 inches long, graduated to SO cm with inclination joint wooden frames 
bellows, ground glass and one double plate holder for 5x7 plates; wooden frames attached 
to two supports on optical bed, upon which they are adjustable ■ tc .bring center of camera into 

nicroscoi, ; fitted with automatic shutter and light-tight connector for micro- 



nligumciit with m 
scope. 




Note:— 10% discount to educational institutions from list price of No. 8500. 

. 315 






METAl^OG R APHICAPP.V 1 v 1 KV..sU,vn, I , 00, CHK iOO I I V 













No. 8504 

METALLOGRAPHIC OUTFIT. BaiiM-h and Lomb RSA. r > FSM9, a mo ntfit 

:m\ t-.; metallograpbii wor] With base conaisting ft h bi U1 . 

stead of iron stand* 

Spec ill cations 

Microscope FSM9. I .,,,, ; , 1%t . 

- i ib< 'I n i. . I. . outfil LA7, 
mentai y tu b< . 

Illuminating System. Same as In I \:. ribed under 

\ .. 350 ■ 

Camera, Constats ol 10x12% u 

ired i M posh ion 
microscope plate \\ ith i lamps, nchoa 

I to I * itl. n joint, 

ing standards! bellows, I s front board 

w it ii light t Ighl conned 
doable plate bold* ad ground g 

B5 t METALLOGRAPHIC OUTFIT. RSA FS1I9, 

desci ibed $434.00 

8306, METALLOGRAPHIC OUTFIT. BUKh and Lomb 
(Tassin), for photography at lo liun 

ions, primarily desigi tfit tl al n 

'- I into the Bhop fo 

cast The micros* opi stag » ith fow 

leveli ng n e w hich m n e as tit. 

The illuminating system consie 15 watt, 120 

v ' ^ azda lamp, mounted in a h< tnisphi I I I. 

with lighl shield, which attaches to th « ertical illu- 
minatoi b3 mi ans of a side tul ith condensing 
»l i m. e i amera, w hieh is - pplied writ! a 
focusing .i glass s. and double plate holdei 
,,,, ■'.■v.' I J inch plates, is attached lo the micro 
bj n nun ing the tube a sub 
- t 1 1 u 1 1 1 » u: one perm&nenth attai hi d to tb 
( •; >"!•'' te u described, with micros* including 32, 
1 6 and 8 nun i l. ject ivea 7 5^ i -I vertical 
illuminator with side tube and eond camert; 
illuminating bj stein and 2 !l1 - 
125.00 



No. 8506. 



Note:_H>'; discount to educational i 



institutions from list prices of Nos. 8504 and 8506. 
316 



■I 






CKX1RAL SCIENTIFIC CO., CHICAGO, U. 6. A 



METRONOMES 






No. 8508. 



No. F781. 



*^ * ■www* pcieej 



■i 



' 



. 



jumr e 



C OUTFIT, Bart* 

"'at Mil 












■**»** 



47A 


47C 


47L 


10,4 


16,4 


32, K5.4 


10.x 


6x, lo.v 


6x, LOx 


S108.75 


111.00 


117.00 



s.'ns. METALLURGICAL MICROSCOPE, Spencer No. 47. Designed for metallurgical work, hut can 
be used in any other opaque work requiring illumination by reflected tight. This microscope 
has coarse ami fine adjustments; revolving stage 120 mm in diameter, adjustable vertically 
by rack-and-pinioci through a range of 45 mm, or may be removed entirely from the instru- 
ment for the examination of large specimens; a prism type vertical illuminator, \n. ^ * > •" - . 

and a special frame Cor holding specimens upon the stage so that the polished surface is per- 
pendicular to the axis of the microscope. The objectives are in special short mounts, corrected 
for use without cover glasses. Microscope No. 47L provides for magnifications fn»m J."» to 
450. Furnished in hardwood cabinet, with lock and key. 

No 

Objectives, equivalent focus mm." 

Achromatic oculars 

Each 

10 % discount to educational institutions. 

Note:— Vertical illuminator No. B654 with attached electric lamp and adjustable condensing tub.- 
can be supplied, if desired, at an additional charge. 

PYROMETERS, see general heading Pyrometers. 

For Meteorological Instruments, see Anemometers. Barometers, Gages, Hygrometers, Sunshine 

Recorders, Thermometers and Weather Instruments. 
METERS, Gas, see Xos. 6786 and 6953 
F781. METRONOME, for counting seconds and fractional parts of a second, etc. I" ftn« mahogany 

Dt i D 

case ' 

F7SL'. METRONOME. Same as No. F781, but with adjustable bell attachment The bell may be made 
to itrike every second beat, third beat, fourth beat or sixth beat 

F783. METRONOME, with electrical connection. No. P781 Metronome fitted with men,,.- . ,,,., .and 
binding posts for traeing time on a revolving drum in connects with a time marker. Makes 

contact at each beat, of the pendulum 

317 



MICROSCOPES 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A 












MICROSCOPES 



We desire to advise our friends and patrons that we are agents foi the celebrated Spencer Mi cro . 
scopes, manufactured by the Spencer Lens Company, and carry a complete stock of all microscopes 
listed herein The Spencer Microscopes are of modern design and embody many distinctive features 

not found in microsco^s from any other manufacturer in the world. The Spencer lenses are guaran- 
teed against all defects. We will be glad to send any one of the Spencer microscopes to responsil,], 
persons for comparison, grade for grade, with any objective or stand of American or European mam,- 
facture, with the utmost confidence that the Spencer will be found to be unsurpassed by any and only 
equaled by few. We unhesitatingly recommend the Spencer Microscopes as representing better values 
than any other instrument on the market. 

The essential features of Spencer Microscopes are as follows: 

The Stands consist of a heavy horseshoe base having rounded corners and a broad pillar cast in one 
piece. The arm is attached to the oiliar by a double-bearing inclination-joint provided with hori- 
zontal and vertical stops. The design of the stands insures the maximum stability of the micro- 
scope. The stand and arm has an alcohol proof, black crystal finish, which gives the instniinenN 
:ui attractive, finished appearance. 

The Anns are of the curved type forming a graceful anl convenient handle by which the instrument 
may be grasped with the whole hand. The wide curve is so arranged to enable the manipulation 
iif large objects on the stage and yet not be an inconvenience to the laboratory worker. The fine 
adjustments are enclosed in the upper part of the arm so as to be fully protected from dust or 
other injury. 

The Body Tubes are standard, taking the objectives with the standard Society screw and standard 
oculars. They are fitted with graduated draw tubes with scale divided into millimeters numbered 
at each centimeter division to facilitate rapid setting of the correct tube length. 

The Fine Adjustments are of three types, which are distinctive of the Spencer Microscopes. 

c . The most refined type is the type B which la used on Microscopes Mo. 852 B54fi and 

■ iv Tin.-- is a sid.- line adjustment, conveniently located to be operated by eith" i hand With I 
graduated drum on the right-hand knurled head to indicate the amount 
of vertical motion, on. complete revolution giving an up and down move- 
ment of 1/10 mm. the graduations reading to single microns (.001 mm). 
There is absolutely no lost motion in this tine adjustment. 

^ l -^/ egular side fine adjustment supplied with microscopes Xo. 85 
and *>0J6, Ifl the type D adjustment. It has but two bearing surfaces and 
three working parts. The patented one-piece construction bearing carries 

.i.d steel screw. This screw, with no less than twenty threads engaged 

Kv.'r i WhSf'Ih 01 US ,n " t, °"- ha f a heavy flanffe F ^king agafnst a 
!?»r«J h ^\ henth * Bcrew l? tu ™ed ^ such a direction as to carry F for- 
ward the lever is so swung as to raise the bodv tube. The reverse motion 
permits the tube to be lowered under the Influence of the spfng The 
fo. using buttons at either end of this screw travel laterallv and" erve s 
a visible index of the center of the fine adjustment ac ion * It eel pins 'in 
the heads iorm positive stops at either end of the excursion The SreS 

fS^&r^^^tST^S^ Iine Und C ° arse ^ustmJnM^^e 

.y J23£t?Z3Z£££ St^SSVi&'SfiSr P "J- sufficient - 

lUtlon mo the bodv tube uN mm I, , " B «2&? t "^ 0ne rev "" 

"•" deteriorate under anj inn -ice. Z d, , ' 'V'"'"' ^ C \ aad wil1 

are mounted din ,-tlv into th ,,ta of 7 ^osphere. The lenses 

harmed when cleaned with a solved T h . T S *** *" *"* Un " 
tube^h of 160 mm and for , £ J^ ™ J» ~- *J . 



' dip)- High power drv eblective , ' '" }'* "V" < Xo - 2 

beef qualiti. eepl under the ah I '' , ' x I"' , ' t "' 1 <° show their 

I- of the atmosi impose wit. XZ ^"^ ™ e Correct tu '" ^ngth 
T.„- 4 mm objeefve which is , ! L " ? 'T ^ 1,,imersio » objective. 

':: ,"■ ,,; "-• -i.i.h is .13 mm .^^77;;' t,;/' 1 ,- 11 ^ a w,,rkin * dis - Diagram of sidc Flne 

AH obp-tiv.-. are made with the Society screw " >m * ° ther make8 ' Adjustment "D." 




^oi-iety screw. 
The Oculars and Condensers are made t„ fit h * , 

Microscopical Society. " the ******** adopted M the Royal 



318 



^^SCIEXTIFIC CO., CHICAGO, U. s. 



M1CEOSCOPES 



r »«w aie^***, 

of \ m , JVc i" . 



*M 



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t'T 



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■ 







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8523. 



B52 I, 







Nos. 8528-9. 

MICROSCOPE, Spencer No. 5, the microscope de-luxe; chosen and used bv scientists for the most 
refined research work. In addition to the general features of the Bpencei Microscopes, de- 
scribed on page 318, this microscope possesses the following special features: 

The Body Tube, 50 nun in diameter, is of aluminum with a black hard rubber finish and mav be 
so arranged that low power photo-micrographic objectives or standard objectives with Society 
screw, with or without oculars, may be used. It will take standard oculars. 

The Fine Adjustment is the type B described on page 318. 

The Revolving Stage is 150 mm in diameter with 130 mm of its surface vulcanite covered. It 
is centered by means of centering screws and may be clamped in any position. The edge is 

graduated in degrees and numbered on every 10 degree division. The vernier with which it 
is provided reads to 3 minutes of are. A mechanical stage furnished with the mierosoope is 

easily attached by removing a plain metal slide from the stage and replacing it with the 
mechanical stage which fits the same slot. The distance from the optical center to the arm 
is 1U0 mm. 

The Complete Rack-and-Pinion Substage, carrying the centerable Abbe condenser (N. A. 140) 
and iris diaphragm with horizontal rack-and-pinion adjustment, permits ready focusing and 
adjustment of the illumination to meet any requirement. The mirror is mounted on :i slot: 
canier, which permits adjustments not possible on other types of microscopes, 

The Mechanical Stage is operated by buttons mounted on concentric axes one above the other, 

providing for a movement of 80 mm one way and 50 mm the other way, 
The Cabinet is of polished mahogany, provided with a lock and key. 

MICROSCOPE, Spencer No. 5, complete as described, with Achromatic Objectives and Huy- 
gheniau Oculars. 

No 5E 5H 5J 

Nosepiece double double triple triple 

Objectives, equivalent focus, mm L6,4 16,4 16,4,1.8* ni,4.:2t 

Oculars..... 10x 6x, lOx 6x. 10s 6x,10j! 

Each $195.75 198.00 240.00 255.00 

•Oil immersion. tFluorite oil immersion. 

MICROSCOPE. Spencer No. 5, same as Xo. 8528, but with Apochromatic Objectives and Compen- 
sated Oculars. f)EApo> 5I , A[ii 5nApo 

KoiiKi":::::::::::::::::::::::::::::: *$** *jj° *j*g 

Objectives, equivalent focus, mm l0 »* ' qjj :' m ' m 

n f . llUro .. 10x lta,15x 10x,15» 

y a ^ h arS '..'.'.'.'.'.'.'.'. '.'.'.'.'. '.'. '■'■ ... ■ 260.25 268.00 350.00 

Prices on Nos. 8528 and 8529 subject to 10* discount to hospitals and educational institutions. 

310 




MICROSCOPES 



CENTRAL SCIENTIFIC CO., CH1CAUO, U. 8. A. 










~ 



Sf>3G. 




No. 8532. No. 8536. 

MICROSCOPE, Spencer No. 44, the most popular of all the Spencer microscopes, many hundredi 
of which are in daily use in medical, educational ami general laboratories In addition to 
general features of the Spencer Microscopes described an page 318, this microscope posses 
the following special features: 

The Body Tube, 37 nun in diameter, is standard, taking Society screw objective- ami standard 
oculars. 

The Fine Adjustment is the type I> described on page 318. 

The Stage, 112x108 mm, is completely covered with hard rubber, vulcanized directly t<> the -tage 
plate. It is provided with spring clipa foi holding slides. The distance from th< optical a 
ter to t he a rna is BO mm. 

The Substage is ,,f the standard quick-screw form, permitting the ready removal of the Abbe 

condenser and iris diaphragm frnm the optical system. 
The Cabinet is of polished mahoyanv, provided with a lock and key. 

MICROSCOPE. Spencer No. 44, complete as described, with Achromatic Objectives and Huy- 
ghenian Oculars. 

?"; ; ■; 4 "*B «D 44E 44F 44 H 44J 

ai.Im- condenser, VA \ L > n | : i n ] .> n j^o 

5y p j? ce .-•■ double double double double triplt triple 

Objectives, equivalent focus, mm 16,4 ]<u L6,4 16,4 i.;.i,i - 16,4,21 

tZu ]S 1(,x 6x,10x lOx 6x,10x 6x,10* 6x,10x 

I m £Z' 7 ' S68 - 75 7L00 80 ' 75 83.00 125.00 140.00 

° T,'lT7i^„:a g Condensei Mounting for Not. 44E, l\ B and J can be supplied at $8.00 

M in R M S |?t?,^ S ^ n ° er 64 ' W ! xceIlen j iptrument, exceedingly desirable for general biology 

J^^^LT^iJ^iJs ZZZ-™" pes * escribed "" page :;,s ' * 

"cularT ™"' '" """ '" diameter ' ia standard, taking Society 8C rew objective* and standard 




MICROSCOPE Spencer Tfn ai 

ghenian Oculars ' com P letc ■■ described with Achromatic Objectives and Huy- 

No 

Abbe condenser ,;JB i]iT > 64E 64F «4H 

N'osepiece "" ■••• •••• X. A. 1.20 X. A. 1 : X. A. 1.20 

Objectives, equivalent focus mm " '* ' ,: double .Inuble double triple 

1 1( M W,4 1(5,4 16,4 I6,4,1J 

1 ►culara oil imia 

Ea ch iOx 6x, lOx io x 6x,10x 6x,10a 

and 8536 subject to ia* T^ ^ "^ 7 *™ ^ " 

ject to io , discount to hospitals and educational institutions 

820 



9Vz 






«d 



CENTRAL SCIENTIFIC CO.. CHICAGO, U. S. 



X: v 



ft 









v« 



cfenwuc Ot;eccrts 

- 

- * ■ 

8100 Si « 

. «"" 



» 



UjrtDC 
hi 

333U 






Mtic Objects - 



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TO **- 




MICROSCOPES 




0l 



■I 

No - 85i0 - No. 8546. 

MICROSCOPE Spencer No. 65. This instrument is similar to No. B536, except for the- shape of 
arm and the type oi fine adjustment. It is a very high grade microscope at moderate cosl 

In addition to the general features of the Speacer Microscopes described .... pagf a 18, this 
microscope possesses the following special features: 

The Body Tube, 37 mm in diameter takes Society screw objectives and standard oculars. 

The Fine Adjustment is of the type C described on page 318. 

The Stage, 112x108 mm, is completely covered with hard rubber, vulcanized directly to the stage 
plate. Beneath the stage is an iris diaphragm operated by a knurled adjusting ring. The dis- 
tance from the optical center to the arm is si) nun. 

A Substage Ring, with spiral slot for focusing the Abbe condenser, is supplied when ordered or 
may be applied at any time without returning the microscope to the factory. The standard 
mirror, .30 mm in diameter, is supplied on the usual swinging mirror bar. 
The Cabinet is of polished mahogany, provided with a lock and key. 
8540. MICROSCOPE, Spencer No. 65, with Achromatic Objectives and Hu'yghenian Oculars. 

No 65B 651) 65 E 65F 65H 

Abbe condenser N. A. 1,20 X. A. 1,20 X. A. 1.20 

Nosepiece double double double double triple 

Objectives, equivalent focus, mm 16,4 16,4 16,4 16,4 16,4,1.8 

01 1 liiiin. 

Oculars 10X 6x. 10X UK- 6x, 10X 6\, lOx 

Each $60.50 62.75 72.50 74.75 116.75 

MICROSCOPE, Portable, Spencer No. 60. A practical, portable, compound microscope of great 
service for field or traveling use. 

The Stand consists of three legs, which fold back, and which are securely fitted at the inclina- 
tion joint to make a very stable support for the microscope when set up. 

The Arm is of the curved type, graceful in shape, light in weight and very strong. The stand 
and arm lias an alcohol-proof, black crystal finish. 

The Body Tube, 37 mm in diameter, takes Society screw objectives and standard oculars. 

The Fine Adjustment is of the type B described on page 318. 

The Stage, 110x88 mm covered with vulcanite, is rigidly fastened to the arm. It does not fold. 

The Substage is of the standard quick-screw form, permitting the ready removal of the Abbe 
condenser and iris diaphragm from the optical system. 

The Carrying Case is aluminum, measuring 8%x6%x3% inches outside, and is so constructed as 
to be dust proof. In addition to the compartment for the microscope, provision has been mad, 
for carrying a haemoglobinomoter and haeniacytonieter. The microscope, objectives and case 

complete weigh 9 1 -. poundls. , __. _. ... 

8546. MICROSCOPE Portable, Spencer No. 60. Complete with Achromatic Objectives especially 
mounted in shdrt mounts provided with threaded protecting caps and with HfcygtojOiMl Ocota. 

\. * ,;„ B 60D C0E fiOF 6011 60.T 

I , ; ;r\ • 1.20 1.20 1.20 1.20 

Abb^nd^eN A ....... ^^ ,„;, cl , lp ,;, triple 

£'7'- —»*-*- % „''•/„, % sxfic, aft" tSffi 

vZ* rs ::::::::::::::: i«w6 10800 115.75 moo ieo.oo 175.00 

* n;i • ' '. tPluorite oil immersion. 

1 immersion- discount to hospitals and educational institutions. 

Prices on Nos. 8540 and 8546 subject to 10 per cent, discount to novjunua 

321 






MICROSCOPES 



CENTRAL annaKTIFIC CO. CHICAGO, P. & A 




8548. 



8549. 



S5< 




No. 8549 "^"■■i 

No . 8548# (shown in place). No. 8560. 

MICROSCOPE Binocular. Spencer No. 3. A very desirable microscope for use Ln routine or re- 
aearch work requiring constant use of the microscope. Both eyes axe used simultaneously at 
theii ttormal convergence for examining objecta or reading print at the normal distance of 18 
inches Such convergence is not conducive to eye strain. A more correct impression of the 
specimen under examination is conveyed through the stereoscopic effect, which makes the ob- 
ject appear more realistic and vivid. A feature <if this model is the interchangeable monocu- 
lar body by means of which the instrument ran be instantly changed into a monocular micro- 
scope, using the same objectives and oculars furnished with the binocular body. 

In addition to the general features of the Spencer Microscope described on page 318, this 
microscope possesses the l'.dluwing special features: 

The Binocular Body consists of a special prism system, in a dust proof case, which divides the 
beam of light and directs il to each eye through a pair of converging ocular tubea ; which are 
adjustable for both pupillary distance and independent focusing. A graduated millimeter scale 
is conveniently placed so thai after the pupillary distance has once been determined, the ocu- 
lars can be instantly set :<t the proper distance without actual trial. Shutters are provided to 
assist in obtaining proper focusing for each eye. The Binocular Body may be instantly re- 
placed by a Monocular Body Tube of 50 mm diameter for making photomicrograph* or single 
tul caminationa Society screw objectives and oculars are used on both sides. 

The Fine Adjustment is of the type B described on page 318. 

The Stage, 112x108 mm, is completely covered with hard rubber, vulcanized directly to the stage 
plate. It is provided with spring clips for holding slides. The distance from the optical cen- 
ter to the arm is 80 mm. 

The Substage is of the standard quick-screw form, permitting the ready removal of the Abbe 
condenser and iris diaphragm from the optical system. 

The Cabinet is of polished mahogany, provided with a lock and key. 

MICROSCOPE, Binocular, Spencer No. 3, complete as described with Achromatic Objectives and 
Paired Huyghenian Oculars. 

N " 3E 3P .".II 3J 

Abbe condenser, N. A 1.20 l.-jn 1.20 LW 

Nosepiece double double triple triple 

Objectives, equivalent focus, mm in,4 ir,4 16,4,1.8 Hi.4,2t 

( 2' u l" < LOx 6x,10x 6x,l fix.Kix 

.«.,. " $163.50 168.00 210.00 225.00 

•Oil tmmersion. tFiuorite oil immersion. 

MonocuarBody Tuhe ,50 mm diameter. For replacing Binocular Body of No. 8546 microscope 
foi photomicrograph!.- work or single tube examinations. Without oculars, objectives or nose- 
I'"" 20.00 

MICROSCOPE. Brinell. Bee Hardness Testers. 

MICROSCOPE. Demonstration. With th. 




Prices on Nos. 8548. 8649 and 8560 subject to 10 



18.50 



per cent, discount to hospitals and educational institutions. 









- 
- 



- ••• • r_:j| 









mar betas 

- 



inivd" dlrMhtf •>■ 






AciwoiUObJ«W« 



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ill* 0- 



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CENTRAL SCIENT IFIC CO., CHICAGO. U. S, 



MICROSCOPES 



MICROSCOPES, DISSECTING 





No. 8564. 




No. 8572. 




80*34 



8567. 

8568. 
8569. 

8570. 

8572. 



8573. 
8577. 



8578. 



Nos. 8577-78 (rear view.) 



Nos. 8577-78 (front view). 



MICROSCOPE, Dissecting, Barnes. A very convenient form of a simple microscope for Btudenl 
work. Consists of a block of hardwood, shaped to provide hand rests on each ride It has a 
polished mahogany finish. A cylindrical chamber, 22x180 mm, closed by a metal slide. 1- pro- 
vided in the base to bold the student's dissecting needles and scalpels. The stage is of glass. 
60x85 mm, and is removable. A minor is permanently fixed in the block at angle to provide 
maximum illumination. A two lens magnifier of large aperture is mounted in a threaded ring 
in the holder, which construction permits fine focusing by turning the lens mounting. The lens 
holder is designed to swing across the entiie stage about a center post arranged to slide ver- 
tically, providing the coarse adjustment. The individual Iensea supplied with this microscope 
vary slightly in working distance and magnification; the average lens has a working distance 
of 35 mm and magnifies 3 J /2 times $2.76 

Magnifier and Holder consisting of No. 856.3 magnifier with lens holder, for replacements in No. 
8564 1.00 

Block, only, of No. 8564 with mirror and stage, but without magnifier and lens holder... 1.75 

Glass Mirrors, only, of No. 8564, 75x75 mm each .08 

per dozen .75 

Glass Stages, only, of No. 8164, 60x85 mm each .08 

per dozen .75 

MICROSCOPE, Dissecting, similar to No. 85(14, but provided with a 12.\ doublet magnifier whicfa 

gives better definition and greater magnification than the magnifier of No, 8564. Working dis- 
tance 12 mm, magnification 12 times 8.76 

Note:— If a 6x or 9x doublet magnifier with 22 mm and 15 mm working distance is desired in- 
stead of the 12x, it can be supplied at the same price. 

Lens Holder, only of No. 8572 for holding doublet magnifiers 30 

MICROSCOPE, Improved Dissecting. Of the same general design as No. 8564, but with the ad- 
dition of several improvements. The parts of the block at either side of the mirror are cut 
out to allow light from the sides to strike the mirror, thus doing away with the necessity of the 
operator facing the source of light in order that the light may strike the mirror. Tin- block im 
hollow bom-nth and back of the mirror, forming a convenient receptacle for dissecting tools 
and lenses. This is closed bv a door, which is hinged at the lower edge of the block. This is 
most convenient because it is not necessary to remove the specimen from the stage or the Ions 
from the holder when a new dissecting tool or lens is wanted. The lens 18 held in an arm, 
Which permits movement from side to side and provides for focusing. A black and white 
metal background is furnished with each instrument. The glass stage is 65X85 mm, with .»x 
doublet magnifier having a working distance of 15 mm 5 - &u 

MICROSCOPE. Improved Dissecting, same as No. 8577, but with 12.x doublet magnifier having 
a working distance of 22 mm 

Prices on Nos. 8577 and 8578 subject to 10 per cent, discount to hospitals and educational institutions. 

323 









MICROSCOPES 



mT ^ AT . MTTENTIFIC CO., CHICAGO, U. 8. A. 




No. 8590. 
On small stand. 



8584. 



K.-jHS, 



8590 



No. 8590. 



MICROSCOPES Spencer Dissecting. An .-xin-nulj well made, thoroughly serviceable and con 

anient instrument at a very i lerate cost. It is made with Bpecial reference to stability, 

,: 1 manipulation and durability. The focusing is accomplished by diagonal rack-awl-piiiiou, 

moving a solid brass rod, whose bearings provide great steadiness and a very an tb movemenf 

of 1,.,,-r r;ill ..,, so that lenses of long focus may be used. Two milled pin beads allow either 

hand to be used in fo< using. An extra large stage is provided, covered with o heavy polish 
glass plate. 75 mm x 100 mm, easily removed. The jointed lens arm permits the lens to bo used 

over :mv |.:irt of the stage. Plane and «• rive mirror is furnished. The hand rests are of 

metal, detaehahle. In hardw 1 ealdnet. 

No. A B D 

Number of lenses 12 1 

Type "'" lens doublet doublet triple triple 

aplanat aplanat 

Magnifying power, diameters 9 6, 12 9 6,12 

Equivalent focus, mm 27.8 41.6,20.8 27.8 tt.ii.^.s 

Working distance, mm 15 22, 12 24.5 36.8, ISA 

Each $16.25 18.00 19.25 24.00 

MICROSCOPES, Spencer Dissecting, similar in construction to No. 8584, with the exception that 
instead of the rack and-pinion focusing adjustment it is equipped with e friction sliding tube 
adjustment. A button ;it the Bide of the pillar moves a strong cylindrical lens arm Bupport, 
whose bearings extend the whole length of the inner surface of the hollow pillar, giving a 
Bteady, b tb movement. Without hand rests, in hardwood cabinet. 

N'o A B C D 

Number of lenses 1 2 1 2 

Type of lens doublet doublet triple triple 

aplanat aplanat 

Magnifying power, diameters 9 6, 12 9 (i - '-' 

Equivalent focus, mm 27.8 41.6.20.8 27.8 41/1,20.8 

Working distance, nun 15 22 1" 24.5 :'.*>.s. 1^4 

Each '.'. 14.50 "l6.50" 17.50 22.25 

MICROSCOPE. Spencer Binocular Dissecting. An extremely convenient binocular microscope 

irk requiring from B to 74 diameti n magnification and a working distance of 25 nun 

(,r " ,,,r - Industrial laboratories will find this tnstrumeni (when mounted on the small stand), 

iv useful for examining large pieces of material Buch as u I textiles paper, leather and 

oua manufactured metal products. Roth the large and small stands are furnished with the 
equipment. 

N " \ b C 

Paired objectives, equivalent focus, mm io 18 32 55.40,25 

Magnifications possible, diameters 34 15 25 29 16 B, 12, 13, 19, 22 

raph 30,34,45,74 

Xjaci1 90 00 110 00 132.00 

Prices on Nos. 8584. 8588 and 8590 subject to 10 per cent, discount to hospitals and educational institutions. 

324 








■ 1 



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ntkika 
vibtWimiiVi 



B 



18.0 

■ 



C 

1 ! 

9 

. 

1SJ5 - 

* ' 1 



CENTRAL SCIENTIFIC CO., CHICAGO 



. U. &. A, 



MICROSCOPES 





No. 8610. 



No. F586. 




Nos. 8614-16. 



P58 i. 



MICROSCOPE, Measuring, with eyepiece micrometer. This micrometer is of new deafen and 
guaranteed to be of tin- highest order of workmanship and accuracy. The pitch of the microm 
eter screw is 0.25 hum, and its run-,. i s 10 mm; since the micrometer head is divided into 10U 
parts it is possible to read to DAnrjr, mm at the cross hairs. Since the magnification of the 
objective is about 3 diameters this is equivalent to a reading of about O.UuOrt mm on the objeel 
being measured. Total magnification, about :jo diametei Complete with No. F591 Support. 

$65.00 

F587. MICROSCOPE, Measuring. Same as No. F586, without support 47.00 

F59L MICROSCOPE SUPPORT. A heavy, adjustable support for measuring microscopes. The micro- 
scope can be held rigidly in any position, as all joints can be tightly damped. Tin base is 
sufficiently heavy to insure the stability required in a microscope used for accurate measure- 
ments. The top of the base is machined, so as to enable the attaching of stages or other acces- 
sories. The diameter of the horizontal and vertical arms is the same and the microscope may 
be clamped in a horizontal position, so as to read a vertical scale. Vertical range about 9 era: 
horizontal range about 12 cm. Illustration shows Microscope No. F587 used in connection with 



pe 
the support. Support only, without microscope 

MICROSCOPES, Metallurgical, see Metallographic Apparatus. 

MICROSCOPES, Projection, see Catalog F of Physical Apparatus. 



18.00 






B 









so" 



■ 



c 
1 

iptua • 

.-• 












t bis** 









B 

- 



- ■ 



119.00 
ttU toirf 



B610. 



Nil! 



MICROSCOPE ACCESSORIES 

(Alphabetically Arranged.) 

ABBE SUBSTAGE CONDENSER. In order to secure the best results with objectives of high 
power, an Abbe Condenser must be used. The condenser illustrated has an aperture \. a. 
1.20 and meets all the requirements of practical work. It is fitted with an iris diaphragm 
beneath to modify the amount of light, and is also provided with a ring beneath the iris to 
hold a bine glass for cutting out the yellow rays of artificial light; or to hold a center stop 
which to some cxt.nt will provide dark field illumination. The mounting is like the cut for the 
friction collar substages or is swung on the arm ol the down-awing condenser mounting. . 12.00 

CAMERA LUCIDA, Abbe's, designed to satisfy the demands of the serious laboratory worker. 
It has a very large mirror, 70 mm x 105 mm, which is supported on adjust.-. hie. graduated 
mirror bar 'its unique, compact mounting makes it possible to place the eye sufficiently close 

to the prism so that the pupil takes i.. all of the divergent rays coming trom the whole of the 

field of the ocular, making the field appear as large and the object rery nearly as > distinct .-us 
when viewed without the camera. The prism is bo mounted that the opening in the silvering 
can be low-red in the i;i s,- of the higher power oculars, or raised with the lower powers until 
it cornea to the exact focus of the ocular. The prism can be so centered by two fon^ntnc 
screws that the field is free from color to the extra lg*- Fhe light from it is modified by a 

series f smoked screens of different densities which may be revolved in and out oi hue he 
tween the mirror and the prism. It is made for the standard <,ze microscope tubes, now inuse 

by practically all American and European makers. Complete in hardwood ease 25.00 

Prices on Nos. 8610 and 8614 suoject to 10 per cent, discount to hospitals and educational institutions 

325 




, ^ii'vi'ii-H CO CHICAGO. U. S. A. 
MICROSCOPE EYEPIECES CENTBAL SCIENTIFIC CO., M . 





No. 8624. 



No. 8630. 



No, 8634. 






8616 CAMERA LUCIDA, same as No. 8614 (sec illustration on procortinff page), with the exception 
t l iat tll( . prism ifl permanently centered at the factory and that there is no means for modify. 
ing the light from the ocular. The prism is the same size and mounted in a similar way. There 
are no Loose parts to get out of place when the prism is moved in and out of the optical cen- 
ter. Complete in hardwood case 515.00 

B624. EYEPIECE, Binocular, for attachment to monocular microscopes in place of the usual eyepiea 
to enable the operator to enjoy the advantages of a mem-objective binocular miei-u>. ■..[.,• with 
ou < the outlay occasioned by puivlmsing another special microscope. This device consist* of 
prism system of the same construction as that of the No. 8548 Binocular Microscope, fitted 
with two converging eyepieces having adjustments for pupillary distance and independent fo- 
cusing It carries a correction lens to compensate for the increased tube length. In attach- 
ing tkis device to the monoculai microscope, the knurled ring at the top of the microscope body 
tube, through which the regular draw tube slides, is removed and the binocular body is fast- 
en.-. I in place bj means ..i' another similar knurled ring attached to the binocular eyepiece. 
In ordering kindly state the make of microscope to which this device is to be attached, as 
the regular ring supplied fits only a Spencer stand. For other makes of microscopes a small 
additional charge mil be made for the special threaded ring. Complete with two paired lOx 
Huyghenian oculars. In a polished hardwood case 50.00 

8626. EYEPIECE, Demonstration, for attachment to i compound microscope in place of the regular 
oi ulai to enable two persons to view the same object at the same time. A needle pointer op 
erated by a knurled handle just below the ocular of the microscope enables tin instructor 
to call attention to any desired detail in the specimen. A knurled ring on the horizontal tube 
to focus the outside ocular independently of the body tube of the microscope, an attach- 
ment nnt found on similar devices of this nature. Complete with two 6x oculars, in polished 

liardw 1 rave 30.00 

8630. EYEPIECES. Huyghenian. In arranging the focal distance of the Spencer eyepieces, the 
method has now been adopted of marking them with figures that indicate in each case how 
manj times th< eyepiece enlarges the objective image, projected the distance of distinct 
vision 2 !0 mm or i-» inches For example, the 4x eyepiece magnifies the objective Linage four 
jmes, andthi magnification of the 8x eyepiece will be twice as great under similar condi- 
™* x l0 ? , " n,ar »' ,w takes the place „f the old xx ;m<l a ox takes the place of the 4x, the 
old designation b. tug based on the magnifications of the image projected the distance of the 
Ucal tube ength, 1G0 mm. The eyepiecea are made to tit the standard tube of the Royal Mi- 
ci os< i pica! Society. 

N"o ^ g - . jy y y 

Ma ring power, diameter* 4 5 6 8 10 1" 

Equivalent focus, mm %2 J5 50 40 30 25 8C 

equivalent focus, inches 2% 2 13 IV 1 ' 

Each 2.25 2 25 2 25 2 25 2 25 2.25 

8634. EYEPIECE, Micrometer, with movable scale 5 m*. ;« i^ M ««« M :..J u „- .i., isl 

ion, 

stage 

gtb 

... --00 

Prices on Nos. 8G16 8624 8626 yjO and 8631 subject to 10 per cent, discount to 

Hospitals and educational institutions. 

26 








L 



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•b*Btf 



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■pi' : twi p 

a ;Lv* of it 

rope *ubl« ike iW 
ig 01 the hoe 

m fans**'** 

rfc*»fc>«tiw"P" 

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+ 



CENTKAL SCiK.NTinc CU„ CHICAGO U. S. A. 



MICROSCOPE ILLUMINATORS 




No. 8636B. 




No. 8642 (shown attached to a 
metallurgical microscope). 



8636B. EYEPIECE, Micrometer, with fixed scale, for use in place of the ordinary microscope ocular, 

wli.-n measurements are to be made in the specimen. It consists of a BpeelaJ I In;, gh< -iiian OCU- 

lar with a finely ruled glass disc mounted between the lenses. The eye Lens is adjustable for 
exact focusing of the scale. The scale is 5 mm in length divided into 100 parts, every fifth 
and tenth lilies being longer than the others. The eyepiece has the same magnifying power as 
a 10x Huyghenian ocular $6.00 

For MICROMETER DISKS and STAGE MICROMETERS, Bee Nos. 8730 to 8734. 

8642. ILLUMINATOR, Silverman (patented), for use with all types of microscopes to provide s light 
source of exceptional brightness for the examination ami photography of specimens either 
transparent or opaque. The essential part of the Silverman apparatus is the circular mazda 
lamp, which surrounds the microscope objective where it is needed, that is, directly en the 
field to be examined. It was primarily designed for the microphotography of metallurgical 
specimens, but in the medical laboratory un sectioned pieces of bone or tissue may be examined 
with the greatest ease. A stage adapter carrying an illuminator holder is provided so that 
the lamp may be clamped stationary either above or below the microscope > The voltage 

of the ordinary electric light circuit must be i educed to a low voltage for this lamp by means 
of the resistance supplied with the complete equipment. Complete with one illuminator holder, 
two illuminator lamps of colorless glass, one resistance with switch and key, one flexible lamp 
cord to connect illuminator to resistance, one attachment plug and cord to connect resistance 
to lighting circuit, one stage adapter, one shutter, one absorption dish and resistance. 

No V B 

For volts 11" 220 

Each 45.00 46.00 

- v. Lamp. Circular, for No. 5642 of plain eolorlesd glass M0 

8643B.Lamp, Circular, for Xo. 8642 of Daylight (blue; glass 4 - 50 

8644. ILLUMINATOR, Dark-Field, Spencer, for use on the microscope in place of the Abbe Condenser 
for making dark ground examinations. This device finds application in the microscopic exam 
ii.ations of living material in which minute details must be differentiated without staining 
and is a necessity in the detection of the presence of the spirochete Treponema pallidum ... 
fresh tissue juices. It is provided with centering screws by whieh its position can be accu- 
rately controlled. A diaphragm is included which must be inserted in the ml-immersm,, ol 
jective in order to reduce the numerical aperture to less than 1.00. A very strong s,,.,r,e of 
light is required for use with the Dark Field Illuminator. Hand Feed A., Lamp No. 8682 or 

the High Power Mazda Lamp No. 8715, are especially suitable for tins pur, Complete 

with diaphragm for 1.8 mm oil-immersion objective, in case 

Prices on Nos. S636B and 8644 subject to 10 per cent, discount to hospitals and educational institutions. 

327 



MICROSCOPE ILLUMINATORS 



< i:\tk 



AI . SCIENTIFIC CO., CHICAGO, P. 8. A 





* 



No. 8b45 



No. 8649 



8643. 
















0V ed t-> and from tin- condensing lens to focus tin- li^ht 




I"""-"' " " ©"Jr. nn 

, .,-, , i, Mt without resistance ♦* MfcW 

6646. Resistance for use with No. B645 to reduce lighting voltage, A.. C. ... D. C. to 6 volts. 

f"; ■ v/.i,:"::::::::::::::::::::".'."".'.".""";^:^^^^^"-"- mi » 

Each «-00 800 

S647. Lamp. Incandescent, Mazda, 6 volts, for >'<•. H«ur, 65 

3649. ILLUMINATOR, Dark-Field, B. & L., with attached electric lamp. Consists of the usual dark- 
field condenser with a compactly constructed illuminating device possessing many desirable 
features The dark-field condenser may be replaced by the usual Abbe CoihI«mimt for trans- 
parent wmk. The lamp housing is of aluminum finished in black and contains a 6 volt, 12 
eandle power, double contact, bayonet Bocket lamp, such as is used in automobile headlights, 

mounted in the focus of a strong curve <• lensing lens, which directs all the light into the 

dark-field condenser. Lf desired the light sour c< may be used with any microscope without 
either the dark-field or Abbe condenser as a substage microscope lamp. A resistance is re- 
quired when used on lighting circuits. Complete with diaphragm for oil-immersion objectives, 
in polished lianhvooi] rase. 3j.OO 

B649A. Lamp, Incandescent, Mazda. 6 volts, i 2 candle fower, bayonet Bocket, double contact with V 

filament f<.i X... kiun 55 

For Resistance for No. B649, <.■-• No. 8646. 

When ordering a sub-stage Dark-Field Illuminator, name the maker, type and, as nearly as pos- 
sible, the year in which the microscope on which it is to be used, was made; or, better still, 
send a rtrip of paper just long enough to circumscribe the sub-stage condenser. This procedure 
will insure a proper fit. 




Prices on Nob. 8645. 8646 and 8649 subject to 10 -er cent, discount to hospitals and educational institution* 

328 



-. L 



h^b^b^H 




**** 



** -,: 



■ mm 






• 




cnxutt Ciaibft 




<t* 




A 
ill 


1 







a wtoswbi kwa 
. dltWligfc 

ltd lav airrt*v 



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"- %2> 



AC «• * 



** 









CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



MlSoROSCOPE ILLUMINATORS 




No. 8652. 




No. 8654. 




No. 8656. 



**•< 



mOT 4 



3652. ILLUMINATOR, Vertical, for use on the microscope for ifluminating opaq, bjects The ill.. 

minator is threaded with Society screw threads so that it may be introduced into the optical 
system of the microscope directly above the objective. It consists of a small prism adjust 
ably mounted in a collar so that light directed on the side opening will be ivtleeted down 
through the objective 00 to the specimen from which it is reflected back to the eve through 
both the objective and illuminator. The opening in the side is arranged .so that it can be 
turned in any direction «j2 QQ 

8654. ILLUMINATOR, Vertical, with attached electric lamp. Consisting of a No. 8652 vertical illu- 

minator to which is added ;i tube ai out six inches in length containing a low voltage electric 

bulb whose position is adjustable to meet the varying requirements of different objective . 
Near the bulb is a disk of finely ground glass which becomes quite brilliantly illuminated. An 
image of this disk is projected by a condensing lens through the illuminator and objective to 
the object, giving an even and brilliant illumination over the entire field. An iris diaphragm 
controls the intensity of the light 35.00 

8646. Resistance for use with No. 8654 to reduce lighting voltage, A.C. or I'.'', to <; volts. 

X.. A B 

For volts 110 220 

Each 6.00 8.00 

8647. Lamp, Incandescent, Mazda, six volts, for No. 8054 Illuminator 65 

8655. IMMERSION OIL, Cedarwood, in l-ounce vials per vial .45 

8656. INCUBATOR, Electric, for use on microscope btfiges. Especially valuable in the Widal test, 

for the cultivation of bacteria, yeasts, spirochetes and tumor cells, and for the observation of 
malarial parasites. Dimensions, 3%x2x% inch over all, with incubating chamber .".xlx 1 .. inch 
deep, having a removable glass bottom, consisting of a regular microscope slide. The top is 
a piece of clear mica with a hole cut through the center through which the lens is pa-s.'d. A 
rubber washer is provided for sealing the opening. Complete with heater, thermometer, tem- 
perature regulator for any temperature from 80 to 110° P., cord and special plug for attach- 
ment to any regular electric lamp Socket, in velvet lined case. 

No A B 

For volts, A.C. or D. C 110 "° 

Each 200 ° 20,0 ° 

Prices oa Nos. 8652, 8654. 8646, and 8647 subject to 10 per cent, discount to 

hospitals and educational institutions. 

329 





t onrvTiFir CO CHICAGO, U. B. A. 

MICROSCOPE LAMPS OCNTjt-VL^'^^ 













l_ 

No. 8682. No. 8689. No. 8705. 

368 LAMP, Hand-Feed Arc, the most powerful light source for microseopica] work. It may be run 
,,„ a | lV | |( , ;.,. circuit, tn. r I>.<\, using the proper rheostat. A rheostat must be used 

to prevent blowing the fuses in the house circuit. The carbons may be m< independently 

at T - a window is provided for observing the are. The light rays art foe 
by mi - r i" a sliding tube. A blue ylass and a ground glass ar< provided, to 
fit in : rout of the condenser. The lamp is adjustable as to heighl and angle. 
Compli • with Daylite and ground gla<a filters, cord and connecting plug but without rheostat 
or carbons S23.50 

- - Rheostats for N " 82, fixed form. 5 am] 

No. V B 

F« »lta 110 22 

Each 8.75 12.00 

1 74->.\. Extra Carbons, Solid, for use with No. 8682 when used on D.C. Length, 6 inches; diameter, *4 
icfa per dozen .60 

F7428C. Extra Carbons, Cored, for us< with Xo. 868°. when on A.C Length, 6 inehes; diameter, % 

inch per dozen .75 

*•;•>' LAMP. Microscope, Miniature Electric, small but very efficient, measuring 2x2x3% inehes, low 
• i - rk beneath the substage condenser, it is usually used in this u. it then 

to swing the mirror of the microscope to one side. Tin back and base of 

i lamp are w i, making its use ei I ly si for laying on a polished desk or other such 

The frame is metal, finished with permanent crystal black which is very dural 
T1 1_i v - .trated filament, anil mav be used directly on any 110- 

v j ,lr • eithej or altera _. It may be used on 220-volt current with Kh 

"' ''• A tor behind the bulb concentrates the light and no light can escape 

tllJ gle opening. The intensity of illumination is ample for the use of 5 

ctive and lOx ocular. Complete with five feet of cord and attachment 
plug, I and Daylite and ground glasses 6.50 

Extra Bulbs for Xo. 8639 1.00 

Rheostat, for use ries with No. S6*9 on . .. olt circuit . . 4-25 

B7 




*7 



1919. The dim mt is a 100 watt, 110 volt mazda lamp in a light-tight housing, with 
Kg** - ' tftheworkar, and with a window equipped with Corning 

" lr H ( ; T'tf I 1 " 1 *' "? alm,,st P ure white u K hT - The *V h '! »' irror of stron S 

•«7-« " «? 1,ght fr ' ' ' he bulb ' whicB is "^ed in an adjustable plate for i ing 

audi ■. - - it™. 1 ^? ' ,, " mir :?:. r, ' ,1 ': , ; to :: ^™^"*S 

Lamp Bulb, for replaeements in N< - - 100 W1 tt. 1 10 volt ma^da bulb . .... 2.00 

Resistance, for use with No. 8705 on S volt circuit 8.00 

Pnces on Nos. «e82 8683 8689 8691 1 8705 and 8707 s.b,ect to 10 per cent, discount 

\o nospitais and educational institutions. 

330 



*. ^ I - 






CENTRAL SCIENTIFIC GO chtp\<,. ir o » 
m-, ' ,II( AGO, U. S. A. MICROSCOPE 



LAMPS 




No. 8715. 




No. 8726 



•■' ■' 



■ 







No. 8730. 




No, 873i. 




No. 8738, 









s7i:,. 






110 | 



W wm\ 



I lh: 






-. V* J, ■* 



8726. 



8730. 
8731. 
8734. 

8738. 



LAMP, Microscope, Spencer High Power Mazda, designed to meet the demand for a very strong 
beam of light without the objections incident to an arc. Equipped with a Mazda gas Idled 
concentrated filament bulb, an independent silvered glass reflector of the proper curve, and 
a pair of 4% -inch condensing lenses which throw a converging beam of liu'lit out thl ;h the 
cone. -May be tilted at practically any angle. An excellent instrument for use with tin dark 
field illuminator, and for photomicrography. This apparatus with an attachable section an. I 
projection objective, forms a very compact and efficient Btereopticon. Complete with 4U0 watt 
Mazda bulb. 

No A B 

For volts HO J* 

Each S2750 27 - 50 

MECHANICAL STAGE, for attachment to the side of any square or rectangular microscope 
stage bv means of screw damps. A stop at the front always insures itfl return to the same 
position on the microscope stage. Should work be interrupted and the m.-chaiucol stege he 
removed, when replaced the object of interest may readily be found, provided the vernier 
readings have been noted. The verniers are placed slightly to one side on thearm of ttie mi- 




with spring clip, and at the other end by an adjustable stop permitting the 

varving lengths from 55 to 95 mm. Complete in velvet laud case '/"'"l' ° 

— . , j- I, ,„;*>, 6 n oi v rnlpcl sralo to lit' laid upon the 1 diaphragm or 

"sS^^wss #«^«rf s rffi- l, :„„. ,. ,,r,'s ( « : o, , ,oo 

_____ _ „ Vn R7 q hllt with scale divided into 100 parts (to 0.0o 

MICROMETER, Eyepiece, same as iso. 8730, but who g 5Q 

;:.;;!' fi ;::;!\h: 1 n„ s nl';,;«uvw2aJt,:rv;r',' S3. •« - ^- ■■■■ ** 

Z- arwwsg5i'&rs£5 aflsa-^ «. - - > « 

they are par-focal. \ B 

No. double I riple 

Btyle 6 00 8.00 

Each 

„..<,. „«i o7ifi •su'biect to 10 per cent, discount 

Prtcs „ N o, ^*^J______\ i-JiS^r 

331 







MICROSCOPE OBJECTIVE . IENTBAL SCIENTIFIC CO., CHICAGO, V. 8. A. 







No. &74UA. 



No. 87iGF. 



No. 8746H. 



No. 8746L. 



<Vl 



OBJECTIVES, Achromatic, Spencer, made in accordance with the very latest and most hi^lUv 
perfected formula* and methods of construction under very rigi»l scientific supervision. The 
optical glass from which the objectives are manufactured is made with careful attention to 
details of both chemical composition and physical control to produce a glass, which long ex- 
perience has shown to be the tnosi reliable, not deteriorating under any influences of climate 
or fttn)<Ksji)jt*re; in fact, the permanence of all the optical parts is fully ^uaraiitrrd. In cal- 
eulating the formulae especial consideration is given to securing flatness of field, critical def- 
inition, resolution and long working distance. All objectives are corrected for a tube length 
of 160 mm and a rover glass thickness of 0.1K nun. High power dry objectives are very sensi- 
tive to these variations. All of these objectives ami N». *7;;s nnsej.ieces are made with the 
Society screw. The lenses of the objectives are mounted directly in metal and are tl..^ un- 
harmed when «|,;ui.-. I uitli a solvent. Nos. H,.l and L are for oil-immersion work. 
- N " V 

Equh alent focus, nun 4s 

Equivalent focus, inches l' 

Numerical aperture o.i 

Working distance*, nun 28 

Diameter of real field with lOx 
01 ulai *, itiiti g # 5 

Magnifi* ation wil h Hk ,,» ular. 22 
Each $6.00 



B 


C 


I) 


E 


F 


H 


J 


L 


32 


25 


i«; 


8 


4 


1.8 


1.5 


2 


1% 


1 


% 


M 


% 


Via 


K« 


1 1 - 


0.1 


O.2.- 


0.25 


0.50 


0.66 


1.25 


1.25 


1.25 


15 


0.5 


:, ii 


1.5 


0.68 


0.13 


0.10 


0.17 


4.7 


3.3 


LM 


1.0 


0.36 


0.20 


0.14 


0.16 


4ii 


00 


10(1 


200 


44li 


950 


L090 


900 


3.00 


6.50 


6.50 


12.00 


12.00 


40.00 


60 00 


55.00 



Magnification Table. 

Tube length, 160 mm. Tm 

Image distance, 250 mm. 



Obji 


Initial 


ti\. - 


Magnifi- 


nun. 


. ation 


48 


2.2 


10 


2.8 


32 


4 


22 


2 1.5 


25. i 


6 


L6 


LO 


12 


15 


- 


20 


■". 




4 


ii 




60 


1.8 


95 


1.5 


109 



HUYGHENIAN OCULARS 



Objcc 



MCM n No. 8746 subject to 




10 per cent, ai .coi,nt to Hospital, , lld educational 



institutions 



■ 






thViltAL SCIENTIFIC CO., CHICAGO, U. 8. A. MICROSCOPE SLIDES 





No. 8750. 



No. 8754. 



t row jLl*. f^iwji 





Nos. 8760-64. 



No. 8768. 



No. 8769. 








No. 8776. 



No. 8778. 



B C 

NO. 8792. 



8750. 



POLARIZING APPARATUS, Polarizer, only, for polarizing the beam of light passing through 




8751 



8760 



POLARIZING APPARATUS, Analyzer, only, for use in connection with No. B750 Polarizer on 
a compound microscope. Mounted to damp securely in any position over the oejdu oi the 
microscope. A graduated circle around the prism mounting is provided for setting the pnsm 
at any desired angle 

SLIDES 
I 




sTr.j. 



S7ii4. 



8768. 

8769. 
8776. 

^778. 

8792. 



general io.Lruxatu&j * t w«** v- ~" -*• i • ** 2 00 

Per gross 

10 per cent, discount in lots of 25 gross. 

SLIDES. Microscope. Non.Corros.ve, medium thick, 3x2 inches, >« v^r«jh ^ ">>*$ 
larger size. In boxes oi % gross • 

10 per cent, discount in lots of 25 gross. 

SLIDES, Microscope, Extra Thin, white glass, 3x1 inch. These **>•»* S^SVK 
suitably paeked to exclude moisture from the po shed surfaces tf si i 22() 

form thickness with finely ground edges. ^ \ of^U 

10 per cent, discount in lots of 25 gross. .... » «• tVwi 

SLIDE. Microscope, Culture, 3x1 inch, with ~jf»*~-? m ^r-on in the ; ,,,er „f the 
slide 18 mm in diameter by approximate^ M™***""'" 

10 per cent discount in lo s of I *«- depression, .each 1.20 

SLIDE, Microscope, Culture, 3x1 inch, same as No. 8768 but Wit P 

10 per cent, discount in lots 




SLIDE MOUNTING CELLS, Glass. Kings w» ••— ■> - -£- B 

scope slides to make cells. _ No ■■•■ ___ ].-, 18 18 

Diameter, mm '" 3 •' J° 

Height, mm .10 -12 •" 

Ea "" r; r t0 Tp:r:::r— : ::u - -«— — 

Prices on Nos. 8750 and 8754 subject to 10 per cent. 

333 



24 
10 

.20 







MICROSCOPE 



SLIDES CENTRAL MSENTIFIO CO., CHICAGO, V. 8. A. 









' !;;:=;::=—:'- 







_ s ^— ; 





No. 8798. 



No. 8802. 



No. 8804 





No. 8808. 



No. 8810. 






H7JIK. 




S799, 



SMIL' 



H804 



8808, 



8810, 



SLIDE EOX, of whit.- wood, with covers fitting inside. Grooved to hold twenty -five 3x1 inch 
microscope slides. Each groove is numbered for listing the slides on the index on the end 
of t be 1 (ox $0.10 

10 per cent, discount in lots of 10. 20 per cent, discount in lots of 100. 



SLIDE EOX, Bame as No. 8798, but to hold twelve 3x1 inch microscope slides 
10 per cent, discount in lots of 10. 20 per cent, discount in lots of 100. 



.09 



SLIDE BOX, of white wood, with covers closely fitting over a projecting rim on the box. 
Grooved to bold twenty-five 3x1 inch microscope slide*. Each groove is numbered for listing 
the Blidea on the index on the end of the box. This box is of stronger construction than No. 

8798 ami recommended for purposes where the box will be used constantly 15 

10 per cent, discount in lots of 10. 20 per cent, discount in lots of 100. 



SLIDE BOX, of wood covend with bookbinder's cloth, with hinged cover and catch. Eoldfl one 
hundred 3x1 inch microscope slides in two rows. Each groove is numbered for listing the 

slides on the printed index on the inside of the cover 1.00 

10 per cent, discount in lots of 10. 20 per cent, discount in lots of 100. 



CABINET, Unit System, f«.r building up a system of filing slides bv placing one cabinet 
another, or B ide by side as the collection of slides increases. The case is male of <iuar- 



npon 




?■ i • ,'•', r v " i l,e deep en, " l " ,1 f " h,,M two slides ' •""' »1"»" the other, in each compart- 
ment. If Med in this manner tin- slides may be separated by rubber Lands on the , <>f the 
upper slide. In this manner the capacity of the case is increased to 1000 slides 27.50 




12 00 



334 



I^B^^a 



raiKs 



m P 



-'- HOB 



■VI 




CK.NTHAL 8MENT1FIC CO., riUC ACiO, U. S. A. MICROSCOPE COVER 



GLASSES 







Nos.. 8811-12. 



Nos. 8813-14. 







No. 8815. 



No. 8818. 



No. 8176. 



8811. 




8812. 



8813. 



8814. 



8815 



8818. 

8176. 
8178. 



c 


D 


% 


1 


22 


25 


L50 


118 


1.60 


1.60 



C 


D 


7 v 


1 


:: 


IT. 


120 


92 


1.40 


1.40 



C 


D 


% 


1 


• 


26 


180 


14D 


2.10 


2.10 



SLIDE COVER GLASSES, Square, No. 1, thickness 0.13 mm to 0.17 mm ,made of the best Saline 
CI lass of uniform thickness. These cover glasses are of a composition, which gives them prac- 
tically no color and yet enables them to withstand the corrosive effects of moisture with more 
fortitude than the white glasses rich in metallic silicates, which readily cloud. Packed iu % 
ounce boxes. 

No A B 

Size, inches \, % 

Size, mm 1 .", 18 

Approx. number per ounce 296 206 

Per ounce $1.60 1.60 

10 per cent, discount in lots of 25 oz. 20 per cent, discount in lots of 100 oz. 

SLIDE COVER GLASSES, Square, No. 2, thickness 0.17 mm to 0.25 mm, saim :is No. 8811, but 
heavier. The optics of compound microscopes arc corrected for this thickness of cover glass. 
Packed in V*> ounce boxes. 

No A B 

Size, inches % % 

Size, mm 15 I s * 

Approx. number per ounce 234 160 

Per ounce 1-40 1.40 

10 per cent, discount in lots of 25 oz. 20 per cent, discount in lots of 100 oz. 

SLIDE COVER GLASSES, Circles, No. 1, thickness 0.13 mm to 0.17 mm, same quality as No. 

8811. Packed in M» ounce boxes. 

No A .! ' 

Diameter, inches "* ' 

Diameter, mm l;' " 

Approx. number per ounce WJJ - 

Per ounce 2,1 ° JiU 

10 per cent, discount in lots of 25 02. 20 per cent, discount in lots of 100 oz. 

SLIDE COVER GLASSES, Circles, No. 2, thickness 0.17 to OJfl mm s:,,,,r " J* X^iS! 
heavier. The optics of compound microscopes are corrected tor th.e thickness of cover glace. 

Packed in % ounce boxes. 

No 

Diameter, inches 

Diameter, mm 

Approx. number per ounce 

"PpT" ftf ffl Cfl ■•■•••■•••■* 

10 per cent.' 'discount in lots of 25 oz. 20 per cent, discount in lots of 100 oz. 

SLIDE COVER GLASSES, Rectangular, ^ ™<^LZ t^s^X^TcoS- 
No. 8811. The optics of compound microscopes are corrected 

Packed in % ounce boxes. 

No 

Length, mm 

Width, mm 

Approx. number per ounce 

Per ounce 

10 per cent, discount in lots of 25 oz. 

SLIDE DISHES, see Staining Dishes. 

- -,iii * ncc fnr hip in staining a number of sli I - simnl- 
SLIDE HOLDER, Basket Form, of nickel* b ass , f or use t . 2QQ 

taneouslv. Capacity, 12 slides, plac«d back to back ^ 

SLIDE LABELS, for glass slides, 22 mm square, in boxes of 100 

SLIDE LABELS, for glass slides, 22xlH mm in boxes o ^^^ lots of 10 ooses 
Prices on Nos. 8176 •&»%«*&£ fi/S 58 boxes. 

335 



A 


B 


a 


D 


•"s 




% 


1 


IS 


18 


22 


_'.' 


286 


196 


LCfi 


112 


1.70 


1.70 


1.70 


1.70 



A 


B 


C 


40 


50 


."ii 


22 


22 


43 


70 


-ii 


;:n 


1.40 


1.40 


1.40 



20 



per cent, discount in lots of 100 oz. 



.10 

.10 






MICROSCOPE ACCESSORIES CKXTKAL SCIENTIFIC CO., CHICAGO, U. 8. A 




No. 8833. 




No. 8858. 





No. 8852. 




No. 8852 (shown in use) 




No. 8864. 



8833. 



SVjJ. 




HS.-..S. 
HMiJ. 

B936. 



ss.; 4 . 



SLIDE mailing CASES, of wood, for 3x1 inch slides. Very convenient for mailing smears 

t« a eentral laboratory per ten pieces $015 

10 per cent, discount in lots of 100. 
STAGE, Warm. Electrically Heated, for use 




"V~ * '• ' p«* », , ana „ , : ,i „„; g f„v a,;;;;:;,,;,:;;, ';,rz e^sCl 

fc^n,m":::::::::::::::::::::::::::;;;:::::::;:;: ± » 

16.00 16.00 

i Band si and clips h„ holding down slides. Diameter of tun. table, 88 mm 7.00 

m^Zf^fkf^ 5 ^' ° f C ° PPer ' f ° r **»* a " d hunting. Length, 350 nun: mdth, 

• 2 10 

£5!W££Eft e^S'sSe "' , ' ,, "" """"i* N °" 8862 « ***** and mousing. Pre- 




Chicago °tVck%riccTo C n P e^ which we list, are earned in our 

educational institutions and b/spttals on P «S "Eluding the preferential discount allowed 
ments are made F. O. B. Chicago we absorb \^ S ' ** the factor * P rices - 0ur shl P- 
factories. Mid-west and western piJchaserTwSf SS te , ans P rtation charges from the eastern 
purchasing these standard items fro^ ou^CKcag * f k" "^ a COnsiderable savtn & by 









336 











•P*l*a»i: 



Ml U Aar jap vK 

A 

... 

it • 

. . , ** ' 

L-B«tk,J3»ttra 
. . 



teamed a* 

*fftfS 



CENTRAL SCIENTIFIC On. CHICAGO U. s 



MICROTOMES 





No. 8880, 



No. 8884. 




No. 8888. 



SSMi 



SSS4 



Hssti. 



s%88. 



8889. 



MICROTOMES 



MICROTOME, Hand, a compact, portable microtome for rapid free hand sectioning. Specimens 
up to 12 nun in diameter are placed in a clamp in the upper end of the inetmmenl and are 
raised through the opening in the circular glass table by an accurately cut screw, which is 
entirely enclosed in the handle for protection from injury and dust. The screw is operated 
by means of the knurled head on the lower end of the handle. A graduated drum divided into 
10 micron divisions enables accurate cutting of sections. The glass table at the top is 75 mm 
in diameter providing a large firm support for the knife or razor. Any section knife or razor 
can be used with this instrument. Without knife or razor $10.00 

MICROTOME, Table, for free hand sectioning of either embedded or frozen specimens measur- 
ing up to 30 by 22 mm. The object (lamp is plaeed in a vertically movable socket, held by 
hardened steel pivot screws ill two vertically swinging arms, which are similarly attached to 

the main frame. The movement thus provided for is regulated by a micrometer Bcrew, with 
graduated disk and index plate. Each division of the graduated disk is equivalent to an ad 
trance of the specimen of 2% microns. The knife travels on glass ways set in grooves In the 

metal of the frame. These plates are extra long, BO that the knife will not he drawn off from 
the ends, thereby endangering its edge. .Mien tome knife No. B966 U especially designed for 
use with tins instrument, but any knife or razor with a cutting edge of 0V6I 7.1 mm can be 

ased. When equipped with a freezing attachment, it makes a very satisfactory microtome 
for frozen section work (see No. 8886). A screw-clamp is provided for firmly attaching to the 
laboratory table. With object clamp, but without knife or razor 18.00 

MICROTOME, Table, same as No. 8884, but with No. 8042 Freezing Attachment for freezing 
with ether in place of the object clamp. Without knife or razor 24.00 

MICROTOME, Simplified Sli din g Carriage, with cutting and feeding mechanism operated by 
hand. Especially adapted for the rapid, but accurate cutting of objects embedded in eelloidin 
or paraffin, and 'when equipped with a No. 8011 Freezing Attachment, frozen sections may be 
cut with equal facility. The object is fed by rotating the ratchet wheel, each tooth represent- 
ing .'. microns. The ob ject clamp of one piece, is extremely rigid; when fully extended, it 
takes objects 30 by 22 mm. The knife is firmly held in an adjustable knife holder. For cut- 
ting frozen or eelloidin sections the knife holder and knife are set at an angle while for paraffin 
they are set at right angles to the direction »f movement. A plain mice. tome knife 00 mm 
or more in length is used on this instrument (see No. 8958AA). The metal frame is very sub- 
stantially constructed in one piece, and is provided with a damp, which enables the lUtrunMnl 
to be attached firn.lv to anv table. Finished in crystal black and nickel plate. Without 
knife ' ' * 7 '°° 

MICROTOME, Simplified Sliding Carriage, same as No. 8888, but with No 8941 Freezing Attach- 
ment for freezing specimens with liquefied carbon dioxide gas, instead of the object clamp 
Without knife 

Prices on Nos. 8890, 8884. 8886, 8888 and 8889 subject to 10 per cent, discount 

to hospitals and educational institutions. 

337 







MICROTOMES 



CENTK 



AL BCD VTIF1C CO ^cmCAGO, V. S. A. 





No. 8893. 



No. 8910. 



8803. 



SSO.I 



s'.«l'i 



8912 



MICROTOME. Automatic. SUding Carriage, with the cutting and feeding mechanism operated 
BimultaneoTaly by a wheel driven reciprocating movement which faeditates rapid sectioning. 
A cam plate which may be set at varying angles to the slide, guides the knife -.nag, ut au 
obUque direction, causing the knife to move in a curv^when cutting the specimen, thus bring 
'me the entire cutting edge of the knife into action with a .Law stroke movement through the 
specimen, making the instrument particularly desirahle for the cutting of frozen ami eelloidin 
sections The knife can be set at right angles to th.- direction of motion tm paraffin section- 
ine ' The object -lamp when fully extended takes objects BO by 22 mm. The feeding median- 
ivm provides fur cutting of o microns 01 more, single divisions of the graduated wheel repre- 
senting 5 microns. A plain microtome knife, 00 mm or more in length is used on this instru- 
ment ("see \u S1G8AA). The metal frame of the instrument is very substantially constructed 
in one piece, and is provided with a damp, which enables the instalment to l.e attached firmly 
to the table. Without knife S870 ° 

MICROTOME. Automatic, Sliding Carriage, same as No. 8893, but with No. 8941 Freezing At- 
tachment for freezing specimens with liquefied carbon dioxide gas, instead of the object damp. 

Without knife 93 ' 50 

MICROTOME, Automatic, Swinging Carriage. The peculiar motion of the knife makes this 
microtome especially desirable for cutting eelloidin and frozen sections, when equipped with 
No. B940 in • zing Attachment for freezing with liquid carbon dioxide, but is not so well suit- 
ed for paraffin work. The extreme ends of the knife rest in the carrier, and, as the lever 
handle moves the swinging arms the knife describes a flattened curve, corresponding to the 
double movement of free baud sectioning. By this manner of holding the knife by arms 
which are not parallel, the entire length of its cutting edge is utilized, insuring uniform wear 
ami permitting the cutting of very large sections. Plain microtome knife Xo. 893SB, 110 mm 
length is used with this instrument. The object clamp will take objects 30 by -- mm. The 
automatic feed mechanism consists of an accurately cut ratchet wheel, keyed to the vertical 
feed screw, in the teeth of which a hardened steel pawl engages. By means of a lever ex- 
tending to the graduated scale on the front of the main frame base, this pawl may be thrown 
out of action or it may be set t" cut sections of any desired thickness. Each division of the 
graduate,! scale marks 5 microns. The drip pan is intended for use with the object damp, as 
shown in the illustration, when eelloidin sections are cut. It is best to remove this drip pan 
when cutting frozen sections. Without knife ?3.00 

MICROTOME, Automatic, Swinging Carriage, same as No. 8910, but with No. 8940 Freezing 
Attachment fox liquid carbon dioxide instead of the object clamp. The rapidity with winch 
frozen section- may be ma< with this equipment recommends it highly for operating room use. 
Sections may be cut. Btained and mounted in IV. minutes from the time the tissue is pkv 
on the frevzng plat.-. In operating the freezing attachment, the valve on it is first dosed 
and the valve at the cylinder slightly opened to admit gas into the connecting tube. Then, 
by opening and closing the valve on the attachment throe or four times in quick su , " ,1 > 
the tissue is frozen without any waste of gaa oi inconvenience caused by condensed moisture 
freezing m the chamber and clogging the system. Without knife 83,5 ° 

Prices on Nos. 8893, 8895. 8910 and 8912 subject to 10 per cent, discount 

to hospitals and educational institutions. 

338 




■ 







£5^L!EIEEE™ CO.. CHICAGO, U. S. 



MICROTOMES 



n m 







No. 8915i 



No. 8919. 






8913 



s'tW 

r iM . 



-:-.. 



- BMli 



b«sV.s 



i: with Sc «M1 Fwat* 

lil 

Cm of tftthrtnai 

"■ 

r kuMia* tfce he 

wmii 

, .ej«u»k?-»J 

•1*4, M to * ■ 

« Br—"* 1 

:,-■ - :- 



* 



891 fi, 



8917 



8919 



MICROTOME, Automatic Sliding Carriage, Precision Model, embodying all of the three elements 
^ ta !^. a ! CUrat !. S ^ tl ? Um ^ V1Z " ^lately *M Object support." inflexible knife 52531 




handled .substantial base easting patterned to resist all strains. It is 350 mm by 170 mm by 
175 mm high. The knife block is 150 mm long east of hard bronze uhhh makes the b.st 
bearings against the east iron of the slide ways. The excursion of the knife block la 300 
mm which provides for the use of the longest knives set at an extremely acute angle to the 
line of movement. Plain microtome knife No. 89.18C of 183 mm length is used with this i„ 
strument. The large feed screw (12 mm in di .meter) is directly beneath the center of the 
object clamp which is the standard ball and socket mechanism that has proven its superiority 
for rigidity and adjustability on the No. 8922 Rotary Microtome-. This together with the large 
heavy solid nut (12 mm in thickness), provides absolutely against any springing downward of 
the object damp. The feeding mechanism consists of an accurately cut screw actuated by a 
disk having 230 notches in its periphery, each notch advancing the specimen 2 microns. 
Sections can be cut from 2 to 40 microns in thickness by multiples of 2 microns through 28 
mm with one setting of the specimen. In Betting the instrument for a oVsired thickness it 
is only necessary to turn a milled bead until the [".inter reaches the proper designation on the 
graduated arc. The whole feeding mechanism, including the automatic parts, is enclosed. At- 
tached to the support for the object clamp is a convenient and easily removable receptacle 
to catch the drippings from the specimen when alcohol is used in the sectioning. Without 
knife clamp or knife $129.50 

Knife Clamps, for use with Xo. 891. "i. Clamp A is the one ordinarily used, ("lamp B is used 
with knives 150 mm or more in length and provides for clamping the knife at both ends. 

No A B 

Length, mm 30 140 

Each 6.00 10.00 

Adapter for CO.. Freezing Attachment, to permit the use of the No, 8940 Freezing Attachment 
with No. 891 3 4.00 

MICROTOME, Minot Simplified Rotary, designed in accordance with the wishes of the late Dr. 
Charles 8. Minot, of Harvard University, for an instrument having the efficiency of the more 
elaborate rotary microtomes, but of simpler construction. The feeding mechanism operates au- 
tomatically and may be adjusted to cut any thickness from 2% to 23 microns. The object 
holder consists of a disk 23 mm in diameter which moves on a vertical slide actuated by a 
crank operated by a heavy balance drive wheel. The knife block consists of a heavy iron 
easting which Is attached to the base and holds the knife in a fixed position, adjustable to 
and from the object and from side to side to permit the use of nearly the entire cutting 
edge. It may also be tilted in its support to set the angle of the cutting edge as desired. A 
plain knife 125 mm long is used on this instrument (see 8938BB). The base measures 196 mm 
by 212 mm. With three object disks but without knife 82.50 

Prices on Nos. 8915. 8<J1G. 8917 and 8919 subject to 10 per cent, discount 

to hospitals and educational institutions. 

339 





















MICROTOMES 



CENTRAL SCIENTIFIC CO,, CHICAGO, U, B A 





No. 8922. 



No. 8925. 



si)-'J. 








B923. 
$925 




work. An 
rpendicular 
ision of an 
make this 
instrument the niost* ,»,.■■ isr aiul accurate for laboratory or research wurk. Sections may be 
cu< of any definite thickness, each section having the same thickness. 

The feed mechanism is composed of a rigid bearing, on which the feed block is moved by an 
accurate screw, cul with two threads to the millimeter; it is revolved by a ratchet feed wheel 
with 250 teeth; each tooth represents therefore a movement forward of the object of one 
micron. The feed is so arranged that it can be set for sections of any thickness, from 1 
micron to 60 microns, by turning the knurled button at the back of the ease until the number 
representing the desired thickensa appears opposite the indicator at the small opening in the 
side of the ease near the balance wheel. The total excursion of the feed is 37 mm, allowing 
a sufficient ranjje for cutting a complete series of a very large object without the necessity 
of a break due to resetting the knife and feed mechanism. 

The up-and-down stroke of the object clamp is 50 nun which permits the cutting of very large 
sections and gives sufficient stroke foT celloidin cutting. The clamp may be held at its upper 
limit for orienting or trimming the block by pushing in a pin. The object may easily be 
rotated. 

The knife is fastened by two damps, eaeli of which clamps the knife at the back and along \ ] \ 
inches of the edge as well. It may be turned to any desired angle, and the clamps nray also 
be moved toward one another to bring them as near to the ribbon as desired to gain addi- 
tional rigidity. When the clamps arc thus drawn together, the knife may be moved so that 
practically all pf the cutting edge can be used before the necessity of resharpening. The 
adjustment screws provide for knives of different widths. The whole knife support is adjust- 
able to and from the object, and is very easily and conveniently clamped in any location by a 
lev.r connected with an eccentric cam. Specially ground knives Nos. 8960A and B are re- 
quired for use with tiii- instrument. 

The whole of the feeding mechanism is covered, protecting the wearing parts from dust and 
presenting a very neat appearance. The top of the case is hinged to the lower part, permit- 
ting it to be easily opened. The balance wheel is grooved, go that the instrument may be 
run by a motor. The whole microtome is finished in crystal black, alcohol-proof enamel. The 
smaller parts are heavily nickel-plated. 

"When desired, the mirmtume is provided with an adjustable knife support which is especially 
adapted to celloidin Bections. The knife holder of this support is adjustable from a horizontal 
position through 55 upward. Complete with three object disks but without knife. .. .$166.50 

Knife Holder for No. B922, for celloidin sections 20.00 

EIBBON CARRIER. Spencer Cylindrical, for use with Xo. 8922, consist in g of an aluminum cyl- 
nil,, ' r counted 111 an aluminum frame, under the base of which are small rollers, rolling in 
the direction oi the long dimension of the frame. The end of the ribbon adheres to the cyl- 
inder, which is slightly turned by the knurled heads shows in the illustration as the ribbon 
lengthens. At the same time, the i finder and frame are gently pushed forward on the rollers 
to place the ribbon on the cylinder in s long spiral The cylinder has aanges at the ends 
that when it is removed from its bearings and placed on a sheet of oaper on the table, the 




Prices on Nos. 8922. 8923 and 8925 subject to 10 per cent, discount 

to hospitals and educational institutions. 

340 



CENTRAL SCIENTIFIC CO., CHICAGO TT A »„„ 
M ^HAbU, U. S. A. MICROTOME ACCESSORIES 



■• -' 






b 



■ i rvAm 






miti tWtmi^tftet 
daapmrWUiito\, 
Tie ibJKt mt tm 

tktekutity 
tack, ud tif tfeipnr 
Ami isMidtopii 
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rf^^JteMl 




■ 










No. 8934 



No. 8936. 







No. 8940, 



,> 




NO. 8942. No . 8941 

MICROTOME ACCESSORIES 

8932. BLOCKS, Red Fiber, for holding specimens for sectioning. 

No A B C D 

Size, inches te*%x% %x%x% %x%x|j lxlx% 

Per 100 $3.50 4.00 5.00 7.50 

8931. EMBEDDING BOX for Paraffine, consisting of two angle pieces of metal with a metal plate. 

No A B 

Height, mm 10 20 30 

Each 1.20 1.25 1.30 

8936. EMBEDDING TABLE for Paraffine, of copper, 400 mm long and 190 mm wide tapering to a 

point. With removable legs, 213 mm high 3.75 

For other Embedding Tables, see Nos. 8862 and 8864. 

8940. FREEZING ATTACHMENT for Carbon Dioxide, for Nos. 8884, 8910 and 8916 Microtomes. Sub- 

stantially made, easy to operate, and exceedingly efficient. A hard rubber non-conducting ring 
between the corrugated plate, to which the object is frozen, and the rest of the apparatus, 
prevents the conduction of cold away from the specimen, thus saving time and gas. The 
chamber is provided with a pin like that on the object clamp, which tits into the same socket 
on the microtome. The chamber is connected with the COj cylinder by a flexible copper tube. 
In operating, the valve at the chamber should first be closed and the valve at the cylinder 
slightly opened, to admit the gas into the tube. Then, by opening and .losing the small 
valve at the chamber three or four times in qoick succession, the tissue is frozen without any 
waste of gas and without any inconvenience caused by the freezing up of the chamber or tin- 
connections. By this method a section may be cut, stained and mounted ready for examina- 
tion in one and one-half minutes from the time the tissue is put on the chamber. Compb ite 
with copper tube connections 

8941. FREEZING ATTACHMENT for Carbon Dioxide, for Nos. 8888 and 8893 microtomes. Same as 

No. 8940, but with damp for attachment to the vertical side of the microtome. Compk-te 
n it h copper tulio connections 

8942. FREEZING ATTACHMENT for Ether. Consists of a freezing chamber of hard rubber which 

so prevents the radiation of the cold that the tissue is quickly frozen. I will freeze .tissue 
15 mm in diameter and 3 mm thick in one m.nute, using only 5 CC of ether .The ^etber 
held in the metal tank, which for filling may be unscrewed from the su ppo t fr ^ ^'^ ' 
suspended. Anv excess of ether which does not evaporate is drained J>aek mto the mete] 
Chamber from which it came. The,, an- no .-ties „r cntan,b,,, tub,, . „« *ust of ether 
It is simple, compact and efficient. It can be used on Nos. 8884, 8910 a... 

Prices on Nos. 8940. 8941 and 8942 subject to ,U MJ« cent, d^count 

to hospitals and educational institutions. 

341 



MICROTOME 11 T"™ OBNtBAI, 8CIEN-HB1C Cg, CHIOAaO, P. a A. 





No. 8947. 



No. 8950. 




No. 8948. 







Nos. 8958, 8961 and 8964. 



8952. 

v.tr.s. 



8946. HONE, Yellow Belgian, selected with the greatest care to assure freedom from grit. Very <)ull 

microtome knives Bhould firsl 1"' honed <>n tins stone dressed with a lather of palm oil n 
until a very fine wire edge appears. A second honing should then be given the knit'.- on a 
blue-green water hone which has a finer grain than the yellow Belgian hen.-. Length, »; 

inches $2.00 

8947. HONE. Yellow Belgian, same as No. 8946 but larger and mounted in a wooden box with cover, 

Length in inches • 9.00 

8948. HONE, Ezy Edge, an artificial hone ma<lo of the finest grade of natural materials, manufacture! 

by a special process, which secures absolute evenness of grit and texture throughout, produc- 
ing a fast, smooth cutting hone combining the sharpness of the artificial hone with tin- soft- 
nes- of tie- Belgian. An edge quite satisfactory for free hand sectioning can be obtained in 
a single boning with this stone. Length 5% inches. With directions for use 60 

8950. HONE. Blue-Green, a finishing bone of finer texture than the Belgian, imparting a long last 

edge. Its slow cutting properties tend to pre, cut over honing. A small rubbing block accom 
panying each hone is used to prepare the surface by rubbing with water. Length, •! in. .50 

Palm Oil Soap, for preparing a lather to dress Nos. 8946-8948 Hones per cake .15 

KNIVES, Microtome. of selected steel, so ground and tempered as to produce an edge which i- 
not brittle and at the game time is hard enough and tough enough to retain it-, keenness. Com- 
paratively easy to sharpen; evenly tempered; broad and heav.i Without handle or back, in 
velvet case. 

No AA B BB C 

Length, mm s»n 110 125 18"» 

Eacn 8.00 8.00 9.00 14.50 

KNIVES. Microtome, similar to No. 8i'.",s. but designed specially for use with Microtome No. 
S922. Length of cutting edge, 110 mm. Without handle or back; in velvet lined case. 

5°- ••. A B 

For sections eelloidin paraffine 

Eacn 9.50 9.50 

Knives. The handle 

-rod i- threaded to •■"- 

htened bj means ol 

2.25 

8964. Honing Backs. ^ ..ing „,- , -l..tt.-.l metal tube provided with a screw damp for attaching* 

,;',: ,'"• a '" 1 *? 6 ? ■*«*» knives as indicated, in order that the knife may 

r ^ u P° n n '" >'""" or strop at the proper angle when being sharpened. 

^nifV'xo.:::: ::::::::::::::::;;;;;;;; :;;;;;;; B 958aa&bb mb »«Lb 

• 1.75 1.75 1-75 

Prices on Nos. 8958. 8960. 8961 and F964 subject to 10 per cent, discount 

to hospitals and educational institutions. 

342 



8«>r,n. 



R9fi1. 




Vi> 



CENT RAL SCIE NTIFIC CO., CHICAGO, U. S. A. 




MICROTOME ACCESSORIES 





No. 8966. 



No. 8968. 






No. 8985. 



No. 8978 





No. 8970. 



No. 8992. 



• ■ ■ ■ "I'S Ul 





No. 8971. 



No. 8994B. 



8966. 



VICS. 



8970. 

8971. 
8972. 
8978. 

898.1. 

8992. 
89943. 

8996. 



KNIFE, Microtome, Chisel Blade, designed for use on Nos. 8884 and 8880 microtome, especially 
where a freezing chamber is need. Cutting edge, 88 mm. The handle is of such size and 
shape that the knife mav be casih held in the desired position §5.00 

KNIFE HOLDER for Safety Razor Blades, of brass, nickel-plated, for use on any microtome 
which has a knife clamp. The thin edge of the blade projects beyond the upper edge of the 
holder just enough to keep it as rigid as possible, and at the same time far enough to allow 
the specimen to pass by the holder after catting the section 6.50 

OBJECT CLAMP, for use on microtomes Nos. 8886 and 8912 in place of the freezing attach 
ment when it is desired to cut paraffine or celloidin sections. Will take objects up to 30 by 

3.00 



2 2 mm 



OBJECT CLAMP, similar to No. 8970 but arranged for attaching to microtomes Nos. 8889 ami 

889." in place of the freezing attachment /■;••■ ': mm, Vi'Z'\» -' A - 

PITH, for use in cutting sections; in sticks about 100 mm in length and 6 to 12 nun in dianv 

eter; in packages of about 50 grams ;•:;•;' 'V 1' Vv * "Jf? P S!??! oJ-t 

RAZOR, Section/folding handle, best cpiality; one side of blade flat, the other side wncave, 
Btraight edge, hard rubber handle; length of blade, 80 mm. In case. ■••••••• y n "''- „„, 

STROP, Microtome Knife, consisting of a Russian leather strop measuring 3 Go by 50 ram, mount- 
ed on a polished wooden block of special shape to allow the knife to some into intimate con- 
tact with the leather strop under slight pressure • • • • • • ••■• •- •• ■ • • • •* l* f * 

STROP, Razor, 21x2 inches, of doubl.- Russian red leather, with India filled back, corrugated. 



with handle, covered on both sides with 



with nickel-plated swivel ami handle 

STROP Razo- Emerson, consisting of a wood strip with handle, covered on ...nu nuci 
biKor, Kazo., imers on, cons .nn o . * u fc b the brown su \ c an d finished 

especially prepared calf skin, me stropping onoum «c «»-s 2_gQ 

mi the .lark side. Length, 17 u. inches per "box - 3S 

DRESSING for strops 

„„-« v) » f „ m n«r rent discount to hospitals and educational institutions. 
Prices on Nos. 8966 to 8971 subject to 10 per cent, cuscuum. ™ » 



Oar Biological Stains, prepared for us by ^^^^^^^ 

of intensive effort and careful roear.h " V^hu c d>est i.n ; . . I inMIP j ng t(l the 

hey are certified by the most rigid eknncaJ an • K. • al M t g ^ 

itisfaetion and confidence that cine, from workin„ „ . i 



use. They 

ii^'i- the 



343 



MILK TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 




pa 



No. 9062 



: 



Nos. 9050 and 9052. 






9050. 
9052. 

:h,:,i;. 



SMlfi-l 
906fl. 

901 

:'o;<t. 



WISH 



".7 



& 



I 

No. 

9056. 




No. 9064 




No. 9066. 





No. 9068. 



THE NADS 
FAULTLESS STIRRINC ROD 
FOR ACIDITY TEST 




NO. 9079. 



No. 9080. 



MILK AND BUTTER TESTING APPARATUS 

(Arranged Alphabetically.) 

ACID BOTTLE, Combined. By tipping the bottle forward and then letting it come bad to 

uprighl position, the pipette will till with 17.5 it of arid $5.50 

ACID BOTTLE TRUNNION, convenient for handling No. '.'050 Acid Bottle. Base is of wood 
covered with lead, which is oot acted on by sulphuric acid. Bottle automatically returns to 

pos ition after tipping 

ACID BURETTES. No 

Number of charges of 17.5 cc 

Each 

ACID DIPPER, Nans' Style, 17.5 cc 

ACID DIPPER. Nans' Style, 8.8 cc 

ACID MEASURE, cylindrical jar with lip, 17.5 c © 
ACID MEASURE, cylindrical jar with lip, 8.8 cc 



A 

3 

2.00 



B 

2.00 



2.60 

c 

12 
2.50 
■40 
.40 
.12 
.15 




**"*?.. of nin^X /°| r US n iQ aCidlty terts - c, «™st« "fa hoilow glaii'rid'coiita'ining ti 



aSSSJ2 ETER ' *" - '" r:i1 h,: " ln '~ Hydrometers'. 
A^KONb. see genera] heading Aprons. 



two 
Id 

.30 




*v uiiiii^iiiuj^ ■ 1 1 1 .»,,,,,,,,, 1 1 1 1 1 I *V«VV 

344 











CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



MILK TESTING 




•3C 



560. 



561. 



1756. 

9092. 






9094. 



909". 



9102. 

9104. 

91US. 

9110. 

9112. 

9114. 

9120. 

9122. 



9130. 



9136. 
9140. 
9142 



I = 



o- 



30 -d 

: 
25- 

20 — 

15^? 

N 





CtKiaai5CIUT(*lCCC 



No. 9095. 



: '"«Kiu«i»-a 



No. 9092. 




euTuisciM'" 1 *" 




No. 9104. 



No. 9108. 



No. 9130. 



I 

No. 560. 



BALANCE, Cream, Wisconsin Hydrostatic, devised to meet the demand for a simple and correcl 
method of weighing cream into test bottles. It consists of a specially devised brass float, 
which is placed in a cylinder of water. The instrument is weighted so as to float in a verti- 
cal position, aud has at the top a small pan on which a cream bottle and a 9-gram weight 
are placed. By moans of an adjustable pin point, the point to which the float sinks in water 
is readily marked, The 9-gram weight is then taken from the p.-m and the cream to be tested 
is weighed by dropping it slowly into the bottle with a pipette until the float sinks to tin* same 
point it reached with the weight on the pan, when the test bottle will contain exactly 9 grama 
of cream. Very accurate weighings can be made with this instrument and as there are no 
hearings to rust it will retain its sensitiveness indefinitely. Complete with metal cylinder, 
float, and 9-gram weight, hut without botl h' $7.50 

Weights, Extra, for Nos. o.">7 and 560. No A B 

Size, grams 9 18 

Each 30 .95 

For other BALANCES for milk and cream testing, see general heading Balances. 

BOTTLES, Aluminum Screw Cap, for holding samples of cream. With cork lined cap. One 

ounce capacity P er dozen 10 ° 

BOTTLE, Butter Test, Illinois pattern, a 9 inch bottle for testing 9 gram samples of hotter. The 
oeck is graduated for reading up to 90 per cent., and the results obtained compare very favor- 
ably with those obtained by chemical analysis 55 

per dozen 5.00 



BOTTLES, Milk Jars, for composite tests, made of flint glass; will stand much hard usage. 

S5 i 2SL ptati ::::::::::::: lm do il 



Per dozen 
CAPS. Tin, for No, 9094 Milk dors. 
Per dozen 



Will fit eitlu r si/c, and keep out dirt and impurities, 



60 



.45 




gram, 50%. Graduated to % 

gram, 50%. Graduated to Vi-% 

gram. 30%. Graduated t«» -,,,% 



Each 


Per doz. 


.30 


2.90 


.30 


2.70 


.35 


3.05 


.35 


3.05 


.35 


3.05 


.40 


3.55 


.40 


3.55 


.45 


4.20 



BOTTLE, Milk Test, b men, n 

BOTTLE, Milk Test, <> inch, 1! 

BOTTLE, Cream Test, 6 inch, 1 

BOTTLE, Cream Test, 6 inch, 18 gram, 40J 

BOTTLE, Cream Test, 6 inch, IS """" 

BOTTLE, Cream Test, 6 inch, 9 

BOTTLE, Cream Test, 9 inch, 18 gram, 3 

BOTTLE. Cream Test, 9 inch, 18 gram, 50%. Graduated to %%.. • ^ • • • • ■ ■ 

Note:-Xin, inch Cream Test Bottles are too long f or -wg ular Ba WMm 

Prices on special testers for cream bottles w. 1 le quoted upon request. 

BOTTLE, Skim Milk, Perfect, 6 inch. Graduated to Vioo* 

ROTTI FS MILK AND CREAM TEST, STANDARD 

The foil J^I^ 

lated by the Bureau of Standards, Washington, Dj< , and adopt . 
atruetors' Association, and by the state oi Indiana. B, 

, 6-iuch, 18-gram, 8%. Graduated to ' ,„%.. • 

d 6-inch 9-gram, .'0%. Graduated to %% 

So-inch 9-fram; 50%. Graduated to >,% - 



.8.", 



9.00 



BOTTLE. Milk. Test, Standard 
BOTTLE. Cream Test, Standard 
BOTTLE, Cream Test, Standard 



Each Per doz. 

.35 3.35 

45 4.15 

45 4.15 



::4:. 



MILK TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 




T 

■ - 

! - 
■ 

■ 







No. 9170 



No. 9172. 



No. 9174B. 



No. 5255 



No. 5256. 





No. 4192, 



<L 



h 







nafis standard 
Buttcr Color Roo 



D 



No. 3850. 



No. 9176. 



9 140. 
91 50. 
9152. 

91i".U. 



.35 

.40 

.40 

..50 



3.05 
3.45 
3.60 
4.45 









917'. 
9172. 

917::. 
9174B. 



Tin 1 following bottles (Nos. 914(5 to 9160) arc made in accordance with the 
s peci fications formulated by the Dairy and Food Commission, Madison, Wis. 

BOTTLE, Milk Test. Standard, (i inch, i8-grain, 10%. Graduated to -',„'; 

BOTTLE, Cream Test, Standard, Cinch, 18 gram, 30%. Graduated to * ■', 

BOTTLE, Cream Test, Standard, 6-inch, 18-gram, 40%. Graduated to &%... 

BOTTLE. Cream Test. Standard, 9-inch, 18-gram. .10%. Graduated to % % 

BRUSHES for cleaning Milk and Cream Test Bottles, see general heading Brushes. 
BRUSH for cleaning Milk Jars, see Brushes. 
CAPSULES, m i -I ■iii-ral ln-adinj; Capsules. 

CA ,f? l IN f p TUBE ' Hart " s - Utr estimating amount of casein in milk. To be used in any Babeocl 
- V,lIk Testcr • each ' S0.40 

CATALASE APPARATUS for determining the p.esence and relative amount of catalase in milk, 

^fhjmeaaurxng arm graduated from to 13 ce in i lu „ divisions. Complete with tube for 

mfSSi SEft " m J l1 "' 1 ' rab ^ r stopper and .lass rod to close hole in stopper 2.50 

^rWn«f^5f < ? rd, * 0r0ne r ek ? reco, ' d of L " ' • with ^'■•'•'•- for both morning and 
mS2JS S.£2 d ? tM ?« "' P 0unda : "" 1 tentha • Per hundred 1.00 



9176. COLOR ROD, for butter color test 






38.10. 



4192. 

.11' 5.1. 



aidthSes , t ? veil > f ^ '-'r isuns of a S lass tu ^- I" ™ '■ "i", eontaining four stand 
"nien? for e,- r . , n t"'' T" , the 1 color t '" 1 "'" 1 ^ of the U. 8. Bureau of Standards. Con 

inite color standard 7 ' "' """"" [ ' lanta for certain markets . akw Ma ''" 



dishes. Milk, of aluminum, flat bottom, straight sides. 

Diameter, inches 

Height, inches 

Each 



A 

2 

.15 



each .50 

per dozen 4.80 

BCD 

2% 3 I 

% 1 

.20 .25 -30 



For other DISHF<? , ^°' ; discount "* ^ts of 12. 

DIDDERS pfafni^^':';? Sf 1 * ^^ Dis * es ' Evaporating; etc. 

Brass, f„r '^g graduations on teat Lotties. Length 4% inchea.... -45 

io < discount in lots of 12. 



5256. 



of fat 

of Iudust 



! " cond.nsed milk and mUk ,, i , m0< l ti0n ° f the B"*** Tube - *°* " 1 «""" 

-trial and Engineering rSSS Vol 7y If 1 B r e 'S ottUeb ™ tho<L ,s '" • , '""" ; ' ] 

6 any, vol. 1A, December 1917, page 1111.) 



346 



- *rrT^; 






CENTRAL SCIENT IFIC CO, CHICAGO, U. S. A. 



TESTING 





FROST'S APPARATUS por COUNTING BACTERIA IN M.LK 

BY THE "LITTLE PLATE" METHOD 




No. 9178. 



A rapid method for counting living bacteria in milk has been devised by Prof. \V. D. Frost, of 
the Bacteriology Laboratories of the Department of Agriculture, University of Wisconsin, combining 
the (Id Koch plate and the microscopic count method-?, but having many decided advantages; it is 
more rapid, requiring one eighth to one-third of the time required for the plate method; it is more re- 
liable in that there is a lack of interference from spreaders; it is more accurate on account of the rela- 
tively larger amount of milk used; it is more comprehensive in that it permits the examination of young 
colonies of bacteria and to this extent offers a means of identifying particular organisms; it offers the 
possibility of distinguishing dead from living bacteria, making it useful in the study of pasteurization; 
it furnishes a means of keeping a permanent record for future use by filing the dry slides; it offers a 
method of determining total number of bacteria by making single cells visible through proper stain- 
ing; it is economical, due to the small amount of materials used, and simple SnOUgfa BO that the tech- 
nique may be mastered in a short time. (For description of method sec Journal of Infectious Diseases, 

Vol. XXVIII, No. 2, February 1921, pages 176-184, "Improved Technique for the Micro or Little Plate 
Method of Counting Bacteria in Milk," by Dr. W. D. Frost; and Standard Methods for the Bacteric 
logical Examination of Milk of the American Public Health Association, Third Edition, page 18, 
•'Microscopic Colony Count (Frost Method . " 

THE COMPLETE FIELD OUTFIT, packed in a substantial metal covered wooden carrying ca^ 
lined with heavily tinned sheet metal, with three inner compartments, the center one of which is double 
walled and Insulated, consists of a double walled copper moist chamber cabinet for in. abating the bae 
leria; a warm table to provide a means of preventing the hardening of the agar on the • little plates ; 
a marking guide to mark off definite areas on glass slides; special forceps for handling the glass slides; 
48 special pipettes, capacity 1/10 cc, graduated in 1/100 cc; a copper pipette box for use in sterilizing 
pipettes; copper beaker for heating water and agar; alcohol lamp for heating water and for stenhzmg 
purposes; Chaddock clamp which may be supported rigidlj on the carrying case for holding the copper 
beaker above the alcohol lamp; 72 microscope slides; wooden slide box; Copbn staining jar; ,TZ S bac 
teriologieal test tubes, 4 by V 2 inches; 4 bacteriological test tubes for media, ^J^eWi J^li* 

thermometer gradu 

ions for use 
(For more complete description vl ttFt ,««-v~o . 

send for Bulletin No. 97.) 

..178. FIELD OUTFIT, Frost's, complete as described, in carrying case provided with lock aml^key 




Note:— For essential parts of Frost's apparatus, see page 

347 



348. 



MILK TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 




No. 9180. 





No. 9181. 




No. 9182. 



No. 9183. 



No. 9184. 



9180. 



it 181. 



!' 1 82. 
i»183. 



ESSENTIAL PARTS OF FROST'S APPARATUS SPECIALLY DESIGNED 

FOR THE FROST "LITTLE PLATE" METHOD 

MOIST CHAMBER CABINET, Frost's, for incubating the "little plates", constructed of sheet 
•oj.|„.r, double walled to allow circulation of moistun-. Length i'.. inches- width \ ;„ !? 
toght.iim.hes: with ,!,:„„,,.., at ...,„,„„ .or holding water, ^vided'wlrh ' a ^vab Stag 
whirl, l-.l.ls s „ th, microscopic slides or 'little plates". When warm water is place/In 

the bottom ehambei and the cabinet placed in an incubator or in the insulated section^ th! 
carrying case, it become, a moist incubator in which the c6lontes on the n. 1, ■ t s" 

transite asbestos on the sides Two'tul . tut h ? ,,aci 1 t ^ : f l,,,,ut 2 Iitere J "' ' wltt 

hold tubes of liquefied ■,- t,', 1- ■ , i \ . " i"- ;' ' the to P • ,l: "'"' 1 at ;m an S le "'' & ■"»•*• 

wi.i,hi 1 ;.x..k,,ui,di..v it;' ,; '.V iit-.r' 1 ; i vl,, T Pr ? v i ded w,th three ■** ,h "-' 

„ gttlj plates with milk and Lar W , ,' t ."^rVi " g "" U: ", m ,:,M " "" char ^ff th J 
FORCEPS. Frost's design ., r to, i . L tSK re for thermometer and cross leve 25.00 

facilitates e^ha^grf thesis **** ***" *** *—**9* ■** ; ' *W "kid 






!»lS4. 
9185. 




Wtmt 




CENTRAL SCIENTIFIC C O., CHICAGO, U. B. A. 



MILK TESTING 







No. 9192 



No. 9194, 







No. 9200. 



No. 9204D. 



*•* » 



9192 TAT TESTING FUNNEL, Shaw, for Testing Fat in Butter, consisting of a special Beparatory 
funnel with capillary stem, used in connection with a special cup in any ordinary Babcock test- 
ini: i ' ntrifuge. In this new test tor fat, the salt and part of the curd are first removed with 
hot water, the remaining curd is dissolved in dilute sulphuric acid, the acid solution is re- 
moved from the fat and the fat determined directly by weighing $3.00 

Note: — The No. 9192 Fat Testing Funnels require special cups to hold them in the Babcock 
testers. These cups can be made by cutting slots in ordinary Babcock cups. The funnels can 
be used only in 8-bottle testers or larger, Nos. 92D4B, G and D, and the International Electric 
Babcock testers. Directions for cutting slots in Babcock cups will be sent on request. 

HYDROMETERS, see general heading Hydrometers. 

HYDROMETER JARS, see general heading Cylinders. 

JARS, Sample, see general heading Jars. 

LACTOMETERS, see general heading Hydrometers. 

0194 MILK TESTER, Babcock, for hand power, with enclosed cut steel spiral gears which run in grease 
without noise.' A clamp is provided for attaching to any table. With seamless brass cups firmly 
secured, of the proper depth to contain hot water to submerge the bottles. Complete with two 
6 inch, 18 gram, 8 per cent, milk test bottles; one 17.0 CC pipette; one 17.:. cc acid measure; one 
test bottle brush, and full directions for use 

9196. MILK 
18 
one commneu li.v-xo cc pipetn -, »u« *••« «« 7&Q 

tious for use 

9200. MILK AND CREAM TESTER, Babcock, for hand power same as No. 9194, but four bottle size 
Complete with four 6 inch, 18 gram, 8 per cent, milk test bottles; two . «Jg"«£°£| 

cent! cream test bottles; one combined 17.6-18 cc pipette; one 17.5 ec and measure, <HU test 
bottle brush, and full directions for use 

9204. MILK 
a 

are 

■plctc 

acid measure,"" one test bottle brush and full directions. B C I> 

No 6 8 '" '- 

Capacity, bottles 17 00 is.oo i9.oo 20.00 

Each ., 

Tor MILK TESTERS. Babcock, International Electric, M »nd« general ,,,„„„, Cenmfuges, 

International. 

349 





MILK TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 






9238. 



9241 



9262. 



9266 



9270. 




No. 9233. 



■b 




No. 9270. 




No. 9262. 



MILK TESTER. Eabcock, Traveling Outfit consisting of a four-bottle Babcock Tester No 9200, 
and tin- iniiuwin<: accessories; — 



ng 

1 6 inch, 18-gram, 10% milk test bottles. 

2 6-inch, 18-gram, 30% cream test bottles. 
l* double Deck skim milk buttles. 

1 cream and milk pipette (17.6-18 cc.) 
l test bottle brush, 



1 floating dairy thermometer. 

1 hydrometer jar, 10x1 "j inches. 

1 17. .") cc arid measui e 

1 small QuevcMiiif's lactometer. 



1 set directions. 
Complete ... handsomely finished hardwood ,■,., with separat, compartments for glassware and 

C ' 315 00 

Cover, with thumb screw and collar for Babeock milk testers Nos. 9194 to 9200 an-1 9238. 
This L8 the ,,ut oi the geai ease which attaches to the table. (Manufacture. '< Mumber 452 I 
1.50 



MOISTURE TESTER. Ames, for aioisture in butter, consisting of a jacketed paraffine son- 

r , :::L*; , ;" 1, , ■£ n*"\ »• out * id . e ^ *» ■ -„,.. 1.-1 bottom £ £»£ L much LI 




™sW P s?Sox65 fc mm d ""^^ ° f ** ta " ,ilk ' aCCOrdin S to **•■• ^thod. In boxes 

per box 2.80 

PASTEURIZING OUTFIT f,,r «t,.o,„ u 

'niem handles and over, anTwith ^iklE' &!?***• S ' "^ ^^ " "V"," 

around the rteriliring .h: ,,- , - 1 t ^t ' "'''''"r, ' l ~ ilt ^.■r.liziag bottles. Beads 

"ith bottles and brash orTtoning ' to Whlch watef *"" be ,ilK " L Comp $S 



:;:»() 



J,* I 






CENTRAL SC IENTIFIC CO., CHICAGO, U. S. A. 



MILK TESTING 





9272. 



!i_';u 



9278. 



9280. 



9282. 
9284. 

9288. 

!»L'98. 




No, 9280. 





No. 9272. 



No. 9288. 



No. 9398. 




THE NAFIS 

FAULTLESS STIRRING ROD 
FOR SALT TEST 



I 




No. 9299. 



PIOSCOPE, or Milk Tester, Heeren's. For showing the richness of milk by color comparison. A 
set of appropriately labeled standard colors is furnished, together with a convenient means of 

comparing with the standards the color assumed by the sample of milk during the test. $0.50 
PIPETTES, Cream. 

No A B 

Capacity, cc 9 ' s 

Each ... 25 .25 

Per dozen 2.50 2.50 

PIPETTES, Milk. 

c^itv;^:::::^ *■*. ™ 

pe^ozen:::::::::::::::::::::::::::::::: «° n 2 - 50 

PIPETTES, Milk, 17.6 cc, in accordance with the specifications formulated by the Bureau of 
Standards and adopted by the Official Dairy Instructors' Association and hjMthe State of 

Indian" Per dozen 3.50 

PIPETTES, Milk, 17.6 cc, in accordance with the specifications formulated by^tbe l>a.ry and 
Food ( 'oinmission of Wisconsin p er dozen 350 

PIPETTES, Milk and Cream, 17.6-18 ec combined Per^ozen 3*00 

PIPETTES, Volumetric, see general heading Pipettes. nn _j_ M 

RACK, for Babcock Test Bottles, of tin. Bangs flat against ; the wall; the bottle, stand upright 

and are easily filled. Capacity, 24 bottles. Without bottles •• ■•• ••■■■■••• - 

SALT TESTER TOR BUTTER. Nan, This apparat, ,s , a— ■ ; . eaaj to ^putoto^ and 

s.lf-adjusting, and is especially suited ~^lVreaS Uself U > zero U that th, only 
butter. Th- fequid in tin- graduated tobe nsta nth a- u.t t 1 W ^ ^ ^^ ^ 

reading to be taken in using the apparatus is at the p< mit ^ on 1 g butter each cc 

liquid surface is located after the test >a completed. With tj£g» ■ , iitter _ ComD i e te as 



mil directions • " w"'"qoqr Salt Tester. This rod is colored to show the 

9299. Stirring Rod, Nans' Faultless, for use in No. 9298 Salt ^« .25 

exact tint taken by the sample when the test is complete 



351 



MILK TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 




II 








NO. 9308. 



Nos. 9322-5. 



No. 9332. No. 9334 



No. 9338. 



in 



^__ __ » I .Mt.M || , |||l| HHiiiT l l| i rmiTt TT7T- 

IIU.j^.U l ^t.jtLl l l l L , " ' .,.■, | i^'ll|)iiim/l|>')U| 

I 1* UACIOKCffclT "CAOIN& 



17 



~~ 



05 



unrrp 




No. 9314. 



Aixnoli. SCORE CARDS. Dairy Cattle, in tablets of 50 si ts Per tablet $0.25 

A1824. SCORE CARDS. Market Cream, in tablets of 50 sheets Per tablet 25 

SEDIMENT TESTER for Milk. Pressure Type, as described by Professors Babcock and Farriae 
ton. Consists of a cyhndei 2% inches in diameter and 6 inches lomr. funnel sli:.t,..,i -t ♦»,„ \S< 



9308. 



9309. 
9314. 



9316. 



>2. 



9332. 

\4 
9 138. 



l »;;40. 




Disks. Absorbent Cotton, ,,„ a8 e *rith No. 9308 Sediment Tester, in boxes of 100 Per box 
SLIDE SCALE. Richmond's, for calculating the total solids in milk, with scale for temoeratnre 




h i t. Foi 6 tack, in-. ,„iik t'-'t I,,,,!! 1 ; a '"' """ als " at ,h< - ,lli ' MI " """"■ "'•' '"' , "" 

ordinary. Hand written paper scale .... 7' * ri """' , ' accurate thermometer than the 

the scale, weighted with shot and ■•'., I ran ',' ",' 7 1 J: " l,i;,,i ""; accurate within one division of 
Bcale range 10 to L10 Fahi, ,,i,, ,r '"' 1 "' '" ""•" "I'-'^lit. Ten inches long. Approximate 

THERMOMETER. Pasteurizing „ i,|, ,„'.", ' .",", " ' V " ' *° 

30« to 220 Fahrenheit; gnrtuated in • 7' : "" 1 u " ,r,n P a P« scale; approxiinate scale range 
Weighted with Bhot, will float upright """ '"" l accurate within one division of thescale. 

• * .90 

MILLS. s„ Crushing and Grinding Apparatus^ 

352 







CENTRAL SCIEN TIFIC CO., CHICAGO, U. 8. 



MINERALS 



MINERAL COLLECTIONS 






No. 9341D. 



No. 9347. 



9341A. 



MINERAL COLLECTION, including the entire list of 128 specimens as given on page 436 of 
Prof. E. E. Dord's revision of Dana's "Manual of Mineralogy." Specimens average l%xl'.. 
inches, each in a tray, the complete set being in two whitewimd boxes $12.50 

9341B. MINERAL COLLECTION, same as No. 9341A except each specimen averages V/jx2Vj inches. 
In improved trays, without wooden box 35.00 

9341C. MINERAL COLLECTION, same as No. 9341B except each specimen averages 3x4 inches 90.00 

934 ID. MINERAL COLLECTION, consisting of 216 specimens illustrating the above text. Each speci- 
men is in a tray lxl inch, complete with oak box 19.50 

&345A. MINERAL COLLECTION, for general geology, illustrating Prof. Hobb's "Simple Directions for 
the Determination of the Common Minerals and Rocks": a "Laboratory Course in General 
Geology." 100 specimens, including whitewood box; also 36 rocks each in tray lVi>x2 inches 
in same size wooden box as the minerals, complete 7.75 

9345B. MINERAL COLLECTION, same as No. 9345A, except each specimen averages 2x3 inches. In 

improved trays, without wooden box 24.75 

"We can also furnish collections for illustrating Crystallography, Physical Mineralogy, Physical 
Geography, Economic Geology and collections to accompany any text. Write for information. 

MINERALS, for Blow Pipe, see Xos. 1496 and 1500 under general heading Blowpipe Apparatus. 

9347. MINERAL COLLECTION (Washington School Collection). Contains the following minerals and 

rocks, good size, each labeled and placed in a separate tray. The whole in a neat cloth covered 
case with a set of unlabeled duplicates (Set No. 9348) for student 5.00 

MINERALS. 

1. Graphite. 8. Quartz, Milky. 15. Amphibole (Hornblende). 

2 Galena 9- Hematite. 16. Amphibole (Asbestos). 

3. Sphalerite. 10. Magnetite. 17. Garnet. 

4. Chalcopyrites. 11. Limonite. 18. Muscovite. 

5. Pyrites. 12. Calcite. 19. Talc. 

6. Fluorite. 13. Siderite. 20. Gypsum. 

7. Quartz Crystal. 14. Orthoclase. 

ROCKS. 

1. Conglomerate. 8. Fossiliferous Limestone. 15. Gneiss 

2. Friable Sandstone. 9. Compact Limestone. 16. Ma Schist. 

3. Red Sandstone. 10. Peat. »• < ^ ** e 

4 Potter's Clav 11. Lignite. 18. Ua\ Mate. 

ft. potter s Clay. j » % 19 Dolomlte . 

\ c f t f 13 Granite 20. Residual Sand. 

6. Calcareous Tufa. irf - urannt. 

7. Oolitic Limestone. 14. Diabase. 

9348. STUDENT'S COLLECTION, consisting of smaller duplicate unlabeled specimens of Set No. 9347 

for student classification 

353 



MODELS 



CENTRAL SCIENTIF IC CO., CHICAGO, U. 8. A 






No. 9360. 



No. 9362. 



No. F7115, 









No. 9371. 



No. 9380. 



No. 9384. 



No. 9386. 








MITTENS, see Gloves. 

g 160. MODELS, Atomic. Kekule and Von Baeyer, consisting of 20 black balls with four connecting posts 
each, in red halls with two eonneeting posts each, 30 white, 10 yellow, 10 ^r.-on, 10 violet, and 
In BUver colored halls each with tubular attachments to slip on the connecting posts, and 15 
nickel-plated binding posts with two clamps $27.50 

9362 MODELS, Valence, Nead's. The blocks representing the positive elements are provided with 
pins which tit into corresponding holes in the blocks which represent the negative elements or 
radicals. On each block is a clip for holding a card on which is printed the symbol of the 
element represented. With these blocks valence, the idea of bonds between the atoms in com- 
b i nation, and equation writing are made jerfectly clear. The set includes 12 blocks for uni- 
valent elements, 6 for bivalent, and 4 for trivalent, half of each being positive, and 100 printed 
cards lor symbols of elements and radicals 7.25 

MOIST CHAMBERS, see Culture Dishes. 

MOISTURE TESTERS, see Grain Testing Apparatus. 

MOLD, Briquette, Bee Asphalt Testing Apparatus; Cement Testing Apparatus. 

MOLDS, Cement, Bee Cement Testing Apparatus. 

!»;:74. MOLD. Pouring, cast iron, with wood handle and round holes, for crucible and scorification 
assays. Number of cavities. 6 Each 1.00 

MOLECULAR WEIGHT DETERMINATION APPARATUS, see Physical Chemistry Apparatus. 

P7115. MONOCHROMATIC FLAME ATTACHMENT for Bunsen burners. A small reservoir which slips 
over the top of the burner is provided with an asbestos wick at the center. This wick sur- 
rounds the mouth of the burner closely and feeds up to the flame any solution placed in the 
reservoir. The flame is therefore continuously colored with the characteristic color of the Ball 
win. h is in the Bolntion, and frequent renewals are not necessarv, as only a small portion of 
be dissolved substrniee is consumed. As the water evaporates inure is ,'asilv supplied. For 
v burner with • 1(i -ineh tube 1,50 



an 



M.-.SII. 



MORTARS. Agate, selected quality, with agate pestles. 
Diameter outside, mm ." 



Each 



50 
3.00 



60 
3.80 



70 
5.00 



1O0 
12.00 



1 25 
18.00 



9384. 

9386. 



MORTAR. Diamond, Leed's Form, of hardest steel. Pestle 50x15 mm 3.50 

MORTARS, Diamond, Planner's, of harden! steel. 
No 

Diaiieter of pestle, nun 

Each 



A 
15 

5-00 



B 
25 

7.50 



354 








CENTRAL SC IENTIFIC CO.. Chicago, V . B. A. 



MORTARS 





No. 9388. 



No. 9390. 




No. 9396, 




No. 9394. 




No. 9402. 



No. 9408. 




No. 9410. 



9388. MORTARS, Glass, with pestle. 

Jf°- "I A B CD 

Capacity, ounces 2 4 a i fi 

Diameter outside, inches 2% 4 41, r 

Each $0.45 .60 .70 120 

9390. MORTARS, Iron, vase shape, heavy, with pestle. 

2* ••.;•••••; a b c D 

Capacity pints ! 2 4 1 ga l. 

bize, inches 4% X 5 5%x6 6V>x6 8x7 

Eacn 1.20 1.60 2.40 4.00 

9394. MORTARS, Iron, Buck's, for grinding and amalgamating, By rotation of the muller, a large 
sample of quartz may be ground in contact with mercury. 

N P : A B 

Diameter outside, inches (51/, g% 

Total weight, pounds.. 30* jq 

Weight of muller, pounds 16 49 

Each , . . . 12.00 18.00 

9396. MORTARS, Porcelain, with spout and pestle; glazed outside, rough inside. 

Outside diameter, mm 65 80 100 130 150 185 213 

Each 36 .50 .60 1.00 1.30 1.60 1.80 

9402. MORTARS, Wedgewood, acid proof, pestle with wood handle. 

No 0000 00 1 3 5 

Diameter outside, inches 3 4 5 6% 8 

Each 100 L30 1.60 2.20 3.00 

MORTAR, Automatic Grinding, see Crushing and Grinding Apparatus. 

MOTORS, Electric, see Electrical Instruments. 

MOTOR-GENERATORS, see Electrical Instruments. 

MOTORS, WATER 

9408. MOTOR, WATER, 5 inches in diameter; may also be used with steam or compressed air. Has a 

two-speed steel pulley for Vjj"" •' round belt Attains the following speeds, depending on the 
water pressure. 

Water pressure lbs 20 30 40 --»«» 60 

water pressure, lbs ^ ^ ^ 3gg() ^ 

This motor mav be attached to an ordinary apparatus stand and used for either stirring or shak- 
ing. The inlet pipe is threaded % inch I. P. thread • • 8 - 7& 

9410. MOTOR, CENCO WATER, a reliable motor made by one of the largest manufacturers of water 




:;-- 



MOTORS, WATER 



CKXTH 



AL SCIENTIFIC CO., CHICAGO, U. 8. A. 




• IMUHICIU. 



tain 



No. 9450A. 




No. 12860. 



No. 12860 as Anode Rotator 
with Flexible Shaft. 



0412 MOTOR CENCO WATER. Same design as No. 9410. Diameter, 6 inches; weight, 7 pounds. 

With 80 pounds water pressure will develop V, h. p. when connected with %-inch house pip.-. 

Complete with grooved wheel for % 2 -inch round belt (see No. F2857), and coupling for threaded 

faucet, but without other accessories 58.75 

941(i. MOTOR, CENCO WATER, Demonstration Form. Sam.' as No. 9410 Water Motor, but with one 

side of glass so that the action of the water wheel may readily be inspected 9.75 

ACCESSORIES FOR CENCO WATER MOTORS. 

9417 Universal Coupling for plain faucet (state outside diameter) .70 

9422 Emery Wheel, beveled edge, 4-inch diameter, •ji G -ineh bole. Regularly furnished with No. 

9410 1M 

Note; — The above emery wheel is for use on Nos. 9410 and 9416 Cenco Water Motors. It may 
be need on No. 9412 Cenco Water Motor if a Stud Shaft, supplied on order, is used. 

12860. MOTOR STIRRER, Cenco Universal, a friction drive motor stirrer possessing the new feature 

of speed control. Adapted to a variety of laboratory uses including elect i iialysis, stirring 
of organic preparations, titration, etc. For more complete description see general beading 
Stirrers, or scud for bulletin No. 85. 

No A B C D 

A. C. D. C. 

For volts 110 220 11" 220 

Each 35.00 37.00 35.00 37.00 

12861. Flexible Shaft, 12 inches long, for use with No. 12860, with guide to provide bearing for 

lower end, and with solid chuck to hold Vi inch rods, ("an be attached to support by any or<li 
nary right angle clam] our No. 2914 i 4.00 

MOUSE JARS, sec Animal Holders. 

MUFFLE FURNACES, see Furnaces. 

MUFFLES for Gas and Oil Heated Furnaces, see Furnaces, Muffle. 

MUFFLES. Alundum, see note under Muffles, Opaque Fused Silica. 

MUFFLES. Clay, all kinds and sizes, send for special bulletin giving sizes and prices. 

MUFFLES. Opaque Fused Silica, see note below. 

Note:— Owing to the great variety of sizes and shapes of muffles in use throughout the coun- 
try, we have made no attempt to offer a complete list in this catalog. We shall be very 
glad to quote prices upon request upon muffles made of alundum, clav or silica. As it is very 
imp.. riant tbat the muffle shall fit the space for which it is ordered' we urge that orders or 
requests for prices be accompanied by (1) a list of dimensions both outside and inside, - 
a statement as to whether both ends are open or one closed, and (3) a sketch showing the exact 
shape of the cross section of the old muffle. 

MUSEUM JARS, see Jars. 



!.4.-.nA.NAlL SET. m;„l, ,.f jdgfc pad* steel, -I inch.. lo„,, ,„, tll ,.„,,, h ;i r (1( . n< ,, , ,„ lt( , rs 3m ,.]v | 

tips concaved, tope oval and the size exact Dfameter at tip, i,, inch 



knurled, 

.15 



356 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 





NITROGEN APP. 





No. 9466. ^ No. 9476. " 

NITROGEN DETERMINATION APPARATUS 

9460. KJELDAHL APPARATUS for Nitrogen Determinations, consisting of Condenser No. 9461 of 

polished copper with block tin tubes and Digestion Shelf No. 9462 of sheet iron, with burn- 
ers provided with individual stop-cocks. Without glass flasks A B 

Number of burners 6 

Each $57.50 93.50 

9461. KJELDAHL CONDENSERS only of No. 94o0, made of polished copper tin lined, with coils of 

pure block tin tubing. Width at top, 6% inches; depth, 14 inches; height including legs, 

24 inches. No ^ J* 

Number of coils '' ™ 

Each th> inches '':::::::::::::::::::::::::::::::::::::::::::::^---"-' ^°° 6oo ° 

9462. KJELDAHL DIGESTION SHELVES only of No. 9460, made of sheet iron with iron rod to 

support flasks, mounted on adjustable legs. A special feature of this shelf is the separate 

stop-cock key provided to prevent burning the fingers when adjusting the flame. Heignt oi 

apparatus to top of sheet iron shelf, 9^5 inches; width, 5% inches. No. ... a « 

Number of burners ,q ^q 

Length of shelf, inches '.'.,'.'.'.'.'.'.'.'. 21.50 33.50 

9466. Kfm^BEL'ijSitenoif OTBLVBS, 'E^ti^BM^'iriiiiiey^mi ^nstant heat ;fo* 

KjddaU digestions and distillation^ with indivulualheat^unrts wJA j^th^ » 

em 

sen 

whi 

Each heater is provided witn hii mutrut-nucm w*« «-~ r ~o . q 

at one time. No g g 10 10 

Number of heaters H0 o'20 110 22 ° 

For volts 43 qq 43,00 67.00 67.00 

.476. KJESSAHL-DISTILlilNG APPARATUS; wall fonn.' ' AH --kin, parts of the appa^axe 
readily accessible from the front The burners : are proved [ ^ S %™™ ndenser tank is 
reflation so that any or al of the burners may be used .at glassware 65.00 

of heavy copper with block tin condenser tubes. With DDurnt ^ Hne 

9478. KJELDAHL DISTILLING APPARATUS, same as No. 94 m, Dm w» s 6? g0 

gas • • • • ■ •"«."" "qi7fi ' mit with supports to stand on the 

9480. KJELDAHL DISTILLING APPARATUS, same as No. 947b. out wwa yy QJ 5Q 

tabic. With G burners • •;• 

357 










NITROGEN APP. 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 












94SL' 



<J4b3, 



ELECTRIC NITROGEN DISTILLING APPARATUS 




No. 9482 (Table Form). 



9481. KJELDAHL DISTILLING APPARATUS. Cenco, Electrically Heated, Wall Form, similar in all 

.-...■ . . f .«*r, 4„ *u« \"« n<T/* i f :ji.Li r\* ».:ii' _^ k ^__i _. . • .1 .*,,»• 



— -*-»*-« *^" * ■■■ m i r» *a «^. * «-i.vx»a w»j, w*avv, AJi^ni^auj X1CAICU, Wdll XUIIIJ, Similar IH all 

espectfl to the No. 9476 KjeLlahl Distilling Apparatus except in the method of Iwaliiig. The 
eating units an- the same as we employ in our popular No. 9647 Cenco Electric Heater. Thev 



re 

have been demonstrated to be superior in efficiency because of the character of refractory em 

ployed and because of their shape aud construction. For these reasons they are very econom- 
ical in the use of electric current, requiring only 250 watts on 110 volts to distill the ammonia 
over at the usual rate. 

No rheostats are included in the heaters, the elements having been wound with the size of wire 
required to maintain the proper rate of distillation within the limits of voltage fluctuation usu- 
al v exj.enen.ed. The heaters are provid.il with transite tops with bevelled openings upon 
which the Masks rest, and can be lowered to permit removal of the llasks. As the Basks do uot 
come in d.rect contact with the heating elements, the danger of breakage is reduced to a mini- 
mum In case of breakage of a flask and the spilling of its contents on the heating element, 
Is sir v V, Tn T\ " rvmoy f> v » n «d out with water and allowed to dry, when it will be found 

a v , , ,' r ™?v Z • ?"? , '" a, " r JS K?^ ed ™ th an i^^'Pendent connecting curd, so that 

.is • n ,1 ?r IS ♦> ° m ' t,me - • Tl1 " ,,r;,t, ' rS ma - V be re ~° ved eutir ^ t '""" the appara- 

tus and used for many other purposes in the laboratory. ' 

^J.-e7ri::Zar r V„^; , !:: f ""f h'T" I,Wil,: " A 1'P«*« » that either gas burners or 

f . , '' " '"'" be Med ' the ■*»■«■ from one to the other being readUy made. 
Compete as described, without supports, but with hooks for hanging on the wall, without glass- 
No 

For volts 



Each 



• • . 



A 

1 l<> 



$103.00 



KJELDAHL DISTILLING APP AR A TTT* r ™ v^o.w 



No. 

For volts 
Each ... 



• • 



• ■ • ■ 



Electric Heater, only for Noa 

No 

For volta . 
Each 



• • 



• • • 



• ■ 



• •«.., 



• ■ * 



• • 



9481 and 9482. 



* • 



• • • * 



• • 



- - 



• t 



• • 



• ■ 



• « 



• * 







■ • . 



A 

110 

105.00 

A 

1X0 

9.00 



B 
220 

108.00 

as No. 

B 
220 

110.00 



B 
220 

10.00 



358 



I 



mh«^* 



t * 



OEHTBAL SenSOTOTO CO.. CHMAGO TJ. 8. A. 



NITROGEN APP. 




No. 9512 






No. 9524. 






No. 9490. 



1MM 



948.1. 
9486. 



9490. 



9498. 
9500. 

9502. 

9512. 

9518. 
9324, 



KJELDAHL DIGESTION SHELVES, Johnson's, consisting of a shelf of iron about 6 inches 
wide and 8% inches high, with holes 4% inches from center to center. The necks of the flasks 
rest in holes in a large lead tube to be connected with a chimney so that all fumes arc carried 
away. Complete with Bunseu burners, with stop-cocks with separate key, but without flasks, 
lead pipe, or support for pipe. 

No A C 

Number of burners 6 13 

Aj •proximate length, inches. 30 65 

Each $25.00 35.00 

Lead Tubing for use with No. 9484, iuside diameter, 4 inches Per foot .80 

Lead Tubes for No. 9484, inside diameter 4 inches, complete with holes for necks of flasks, 
and with support. With outlet tube 12 inches long, located in middle of long tube, unless 

specified otherwise in ordering. 

No A C 

Number of holes 6 13 

Each 1500 200 ° 

KJELDAHL DIGESTION APPARATUS, Sy's Fumeless, permitting digestions to be made with- 
out the use of a hood, provided a water supply and drain are available. The glass filter pump 
effectually disposes of the fumes as they are generated. Complete with support stand, clamps, 
quadruple burner, filter pump, four bulb tubes and four 500 cc Kjcldahl flasks of Pyrcx glass. 
(See Journal of Industrial and Engineering Chemistry, Vol. IV, No. 9, for September 191 2 J 

KJELDAHL CONNECTING BULB, original design. Diameter, about 58 mm 55 

KJELDAHL CONNECTING BULB, same as No. 9498, but with straight connecting tube for 
bending to any angle 

KJELDAHL CONNECTING BULB, as modified by Hopkins. (See Journal of American Chem- 
ical Society No. 3, 189(5.) ' ' 

DELIVERY BULB TUBE, for Kjcldahl Apparatus. Prevents sucking back of condensed liquid 

from receiving llask 

For KJELDAHL FLASKS, see Flasks. 

NITROGEN BULB, Presenilis* 

NITROGEN BULB, Will-Varrentrap's, with three bulbs 

359 






NITROGEN APP. 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 










No. 9530. 



No. 9546. 



No. 9550. 



No. 9556. 






9530, 



9531. 



95.;::. 
9.134. 
953."). 
9536. 
9537. 

'.'.-.38. 
9546. 



9550. 



9556 



NITROMETERS 

NITROMETER, Du Pont, latest modification. Used by manufacturers of explosives for the anal- 
ysis of nitric acid, etc. Complete with glass parts, iron stand and rubber connections, as illus- 
trated. | S,e Technical Paper 160 of the United States Bureau of Mines.) $75.00 

Glass Parts, only of No. 9530 25.00 

Parts and Accessories for No. 9530 

Compensating Tube only, with open tube for scaling when standardized 1.80 

Generating Bulb only, holding about 300 cc, with two stop-cocks and reservoir 6.00 

Measuring Tube only, graduated from 10 to 14 per cent, in 0.01 division 5.00 

Mercury Leveling Bulbs only eac h .75 

Three-Way Tube only, for conn.eting compensating tube to measuring tubes and Leveling hulb. 
60 

Universal Tube only, graduated from to 100 per cent, in % divisions 7.50 

NITROMETERS. Lunge's, with three-way stop-eock and plain Leveling tube 

Graduated to, cc , ^^ 

EaCh 4.50 

NITROMETERS. Lunge's, same as No. 9546, but provided with special three-way stop-eoek. 

With plain leveling tub.-. 

Graduated to, cc ^^ 

EaCh 5.00 

"^22^^ " in * « **■—« - -.Tort with r voir, *»> 

360 



ifcg 



CENTRAL SCIENTIFIC CO., CHICAGO, TJ. S. A. 



NITROGEN APP. 





05«i0. 



9561. 
9562. 

9563. 

9564. 
9566. 



9567. 
9568. 
9569. 
9570. 

2361. 
2362. 
9580 




9600 
9601. 

9608. 
9609. 




No. 9609, 



No. 9560. 




No. 9580. 



NITROGEN APPARATUS, Van Slyke's, for the Gasometric Determination of the Aliphatic 
Amino Groups. With this apparatus, a complete determination of the nitrogen in amino acids 
tan he made in less than 10 minutes with an accuracy equivalent to that of the Kjeldahl 
method It has the further advantage of permitting successive determinations to be made 
without disconnecting the parts. Any amount up to 10 cc may be analyzed with an accuracy 
of Kin milligram of nitrogen. This apparatus can be used for the study of protein digestion, 
both' in vitro and in vivo; the determination of the nature of the amino acids yielded by 
hvdrolvsis of small amounts of protein; determination of free amino groups in fixing the 
constitution of various organic substances, and the determination of amino acid nitrogen in 
urine, blood and tissues. Complete with glass parts and supports pulley, shaking device and 
connections, but without electric motor. .See Journal of Biological Chemistry, \ ol. XU page 
275, for 1911 and Vol. XVI, page 121 for 1913.) ^5.UU 

Glass Parts only of No. 9560 ; • • ■ • v : 9 ,' nn 

Deaminizing Vessel only of No. 9560. Graduated to 10 cc ir. i /10 cc divisions »J.W 

Gas Burette only of No. 9560, with three-way stop-cock, leveling bulb and connecting tub...*. 
Graduated to 40 cc in Vi cc divisions 400 

NITROGEN %JU«SN& tSSV itaiii' 'to NoV MM ' but' 'i^h ".i» / -«l''-l 
™™L C^,Mc witl S u„,Ls, V*ft shaking W hce. ; aid conu.eUons, but ».U, ; u. 

motor 35.00 

Glass Parts onlv of No. 9566 • • • • ■ .■*"• i;Ji"J««« 24.00 

Deaminmng Vessel only of No. 9566. Graduated to 2 cc in Ho cc dn isions ^ qq 

Gas Burette only of No. 9566. Graduated to 3 cc in Vio© cc divisions. . ^^•"_''*''''' 4f0 o 

Gas Pipette onlv of No. 9566 •-.--- " ' VA-cc 

Motors, Variable Speed, for use with Nos. 9560 and 9o6b. ^ QQ 

For 110 volts ■ ;;'.!'.;!!'.!!".!!'."! 27- 00 

For 220 volts •■• ; *"■'"' V wJ ttatipp O Denting of the Uni- 

NOMON, a Calculating^Chart, Ohemisto' JB^J^fJg on^ bound iogether^n book form, 
versity of Illinois, 
each section contai 
divisions. By means 
raising to powers, 
and with an accura 

cally all the special matnemaiuu. ^•»'— ; " • book of scales, ttve piace "»"«= 

can be performed easily and accurately. Complete *«*™ ^ flnd factors ^ 

logarithms, and a manual of instructions containing tables o ^ 

veniently arranged for use - • ™ 

OIL CAN,' zinc, diameter 2 inches, 22 cc capacity .25 

OIL CAN, same as No. 9600, filled with fine sperm oil 

OIL SAMPLE BOTTLES, see general heading Botues. .75 

OIL STONE, Washita, genuine 5-inch, unmounted . . . . • ■ • • ■ • .90 

OIL STONE, Washita, Mounted, same as No. 9608, mounte 

361 



OIL TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U, 8. A 




96 U. 



9010. 



0620 



0622 



No. 9616. 



No. 9622. 



No. 9614. 

OIL TESTING APPARATUS 

BABCOCK FLASK, for Unsaturated Hydrocarbon Test of Gasolines, consisting of a modified 
Buhcoek bottle with neck calibrated from to 100 for direct reading in percentage, ('anacitv 
Of graduated portion of Qeck, 10 cc; height ov -r all. 6U inches. (See Specifications riven in 
Technical Paper No. 298 of the U. S. Bureau of Mines.) $0.75 

CALORIMETERS for determination of heat units in Oil, see general heading Calorimeters. 

CARBON RESIDUE APPARATUS, Conradson, for determining the carbon residue in petroleum 
oils and bituminous materials, adopted as the standard apparatus for this determination by the 
Amen, an Society for Testing Materials. The apparatus consists essentially of a heavy base 
of asbestos slate with beveled opening and an annular groove in which fits a Russia iron chim- 
ney; a large wrought iron crucible supported from below hv a tripod and pipe-stem triangle, is 
placed in the opening in the asbestos slate and contains a Skidmore crucible, in which, in turn, 
KJ5o?*Jv P° rcelam cucible intend, d for the sample. (See Standard Methods for 1921, 
D4.-1 of the American Society for Testing Materials.) Complete as illustrated with iron tri 
pod, pipe-Stem triangle, asbestos slate base, chimney, two iron crucibles, one porcelain crucible, 
and gas burner. L g qq 

^^'•^ D ? V<m ' f " r tW0 l0 ° ec B -S.oil tubes. The 'machine will whirl' two 100 re 
tubes hlle.] with liquid at 1500 revolutions per minute. The strong iron horseshoe damp with 
thumb-screw permits rigid fastening Of the centrifuge to the edge of the table so that the 

lt\ b V 1 ;" ra .V;V VIth »"»M»1UB Of vibration. Complete with two-tub, arm w,t»i coni.-al 
shields, and with two graduated glass tube, x . 9631j n . ailing (] ireetlv in percentage of B. E 

25.00 

^aWm^Sf' ^, ater ,^ tor - ****? j* construction to No. 9620, but operated bj , baU-bearing 
l d ±l ^l r : J^ S,,: '" ^suspended on hardened &fc eel ball-bearings in such a way that the 






9CL'4 



percentage of B. S \ ~ / "~ "•"— glass nines «o. smkji, reaaing 

CENTRIFUGE, Electric, mounted on heavy Mam«l«j lllf 7,1- iJ.ll" lUllIsl- 11711*7. The 

thnc 

tubes 

No " ~~ ' *— -«« "* "• o., aiiacument cord and plug. 

For volts ... A B I " D 

Each 110A.C. 220A.C. 110D.C 220D.G 

60.00 68.00 60.00 68.00 

362 




.:_* ..'if 



>_^w 




CENTRAL SCIE NTIFIC CO., CHICAGO, U. S. A. 



OIL TESTING 



— « 



■=-*! 



' = 





JX 






i c-sc. ; 

i i 

\ l 



i 




No. 2556. 



No. 9631. 



No. 2714. 
No. 2715. 
No. 2717. 




No. 9633. 
No. 2737, 




No. 9636. 



i m 



u**> muistiig tf | 

■i it ptreatfe 

s 

1 
til i^4i« (Una* 

e carbon refidatu petal 

• ' • ■ I 

I MKBtilllV of 1 ': 

■ . 

nriNf.ii rt 

Wkofci* - 
.utntdiii 

pjKhin* "ill ■ 

mg iroi harwk**"* 

^ ttbk»«! 

3 

n pew*? 1 
.jnlttbuklH 

I 

I 



6K» 



9629. 
9556. 



2:,."i'.-\ 

9631. 






9C3.J. 



2737. 
255S. 



2681. 

2G84. 
2714. 

2715. 

2717. 



2717A 
2730. 

2732. 

-7:;7. 

-746. 



Parts and Accessories for No. 9620-22-24 Centrifuges. 

Head, Two Place, for centrifuges Nos. 9620 to 9624, with two trunnion rings and metal shields 
for 50 cc glass tubes No. 2556 $ 8.30 

Glass Tubes, Graduated, 50 cc, fur use in metal shield No. 2.158 on head No. 9629, for the ex- 
amination of kerosene . each, .60 

per dozen, 6.50 

.Glass Tubes, Graduated, 50 cc, same as No. 2556, but of Pyrex Glass each, 1.50 

Glass Tube, Graduated, for use with centrifuges Nos. 9620-22-24, fur the determination of B. S. 
in oils. Capacity 100 cc, graduated in 2<>0 parts. As equal parts of oil and gasoline or benzol 
are mixed in making this test, this graduation enables the B. 8. to be read direetly in percentage. 
By means of the narrow tip, amounts as small as 1/10 of one percent can be measured 1.40 
Glass Oil Tube, Graduated, 100 cc, for use with centrifuges Nos. 9620-22-24 and in trunnion 
carrier No. 2737 for use with Internationa) Centrifuge. Graduated in 1/10 cc divisions to 3 cc, 
in V:. cc divisions to 5 cc, in 1 cc divisions to 10 ec, in 5 cc divisions to 25 cc, and in 50 cc 
divisions to 100 ce. (See Tentative Specifications of the American Society for Testing Materi- 
als for 1921, No. D96-21T) 1-30 

Trunnion Carrier, for glass oil tube No. 9633, for use in head No. 2684 3.00 

Metal Shields, for use with heads Nos. 9629 and 9630, for holding kerosene tubes No. 2556. 

each, .35 

Oil Accessories for International Centrifuges. 
(For International Centrifuges see general heading Centrifuges.) 
Head, Four Place, for 50 cc trunnion sings No. 2732, and with trunnion ring No. 271o for In- 
ternational Centrifuge No. 2 • ••• 

Head Two Place, for trunnion carrier No. 2737 for oil percentage tubes 4.50 

Metal Shield, for 100 cc tapered gla«s oil tubes. For use with No. 2715 trunnion rings on 

head No. 2681 in size No. 2 Centrifuge only. With rubber cushion 1-75 

Trunnion Rings, for metal shield No. 2714, for use with head No. 2681 on size No. 2 eentrv 

GllT Oil 1 Tubes," Graduated',' 10o' cc! with'tap'er.Vl' bottom* and narrow neck. Graduate,! in 

terials for 1921, No. D96-21T) • ■ ■ ••„ - ? • •••••• ■ ■ — £ ^ 

.Glass Oil Tubes, Graduated, 100 cc, same as No. 2717, but Of Pyrex . ._ en. 

Metal Shield, for 50 cc glass tubes No. 2746, on trunnion r.ng No. 2732. With rubber cushion 

Trunnion Ring, for 50 cc mctal . ^ ic ! d ili ^ l -, ^T^MBA ' for" 'use 'With head "No." ' 2684.' With 
Carrier, for oil percentage tubes >so. <s/i»a, iui 



Trunnion 
rubber cushion 



.50 

ith 

3.00 



GlSs Tuoe's^uated: 50 cc! with ^hort'tap^d bottoms ami pour out Jg*JJ« in K cc 
divisions to 10 cc and 1 cc divisions to 50 cc For use in No. 2730 metal shiew.ee ^ ^ 



2746A 
9636. 




and a standard cold "test thermometer ■ graduated from -*> to i- - m7 _ n ^ 9 . 00 

plete as described. (See A. S. T. M. Tentative Speed ^ilVto^ F. in 2° divisions, 

bove, solid stem, graduated from 30 to nu g M 



13612. THERMOMETER only for a 

scaled for 4% inch immersion 



363 



OLL TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 3. A. 





3093. COLORIMETER, Saybolt Universal Chrono- 
meter, for determining the color shades of 
refined petroleum, adopted by the U. g 
Government and the National Petroleum 
Association. The instrument consists es- 
sentially of two removable glass color com- 
parison tubes, one being arranged for the 
insertion of the standard yellow glass disks 
in the bottom, the other being graduate.) 
in inches and having a brass draw-off cock 
in the bottom to adjust the height of the oil 
column. The graduated tube is divided 
into one-eighth inch divisions up to 2(J 
inches. In addition to the comparison 
tubes, the instrument is furnished with a 
prismatic eye-piece which brings into single 
eye-vision a field with one-half illuminated 
by light reflected through the plain tube 
containing the yellow glass standard, and 
the other half illuminated by light reflected 
through the column of oil under examina- 
tion in the graduated tube. Two color 
glasses are provided with the instrument, 
both glasses used together to determine 
color shades up to and including the arbi- 
No - 3093 - No - 3097 - trary value +15, and only one glass from 
+ 16 to +25. To make the comparison, oil is placed in the graduated tube ami the color glass 
inserted at the lower end of the plain tube ; The oil is now withdrawn from the graduated tube 
until the color observed through the eye-piece agrees with that of the standard glass. The color 
is then expressed by the height of the oil column in scale divisions, 4-4/8 inches of oil in the 
tube, ufiing two color slides, being equivalent to zero color shade, or "standard white," and 
1J inches of oil, using one color slide, being equivalent to +21 color shade, or "water white." 
The color values for the intermediate readings on the graduated tube may be obtained from the 
table provided with the instrument. (See Technical Paper No. 298 of the U. S. Bureau of 
Mines. Complete with two standard glasses, color table and direction card, in wooden carry- 
ing case 580.00 

3093A. STANDARD COLOR GLASSES, for No. 3093 each, 15.00 

3097. COLORIMETER, Tag-Robinson, for determining the color-shades of lubricating oils. This instru- 
ment is of the same general type as the Saybolt Universal Chromometer, except that, inasmuch 
as the depth of the oil under test need not be varied through as great a distance, the varia- 
tion is accomplish. -.1 by an immersion tube, which can be raised and lowered by means of a 
rack and -pinion device. Headings are made on a scale in the face of the Instrument opposite 
the index, and indicates the depth of oil necessary to match the color shade of the standard 
color glass which screws into the color standard plunger. Three standard color glasses are pro- 
vided, m,e yellow No. 3 , for light oils; one amber (No. 2), for medium colored oils; and one red 
(No. 1>, for dark oils. With these the complete range of color-shades for lubricating nils is 
secured, including all the National Petroleum Association Standards. Complete as described, 
with three standard color glasses mounted to screw into the color-standard plunger, color tabic 
and direction card, in wooden carrying case 100.00 

3097A. STANDARD COLOR GLASSES, mounted to screw into color-standard plunger of No. 3097. 

No 

Each 



1 
12.50 



2 
12.50 



3 

12.50 



Table of National Petroleum Association Standards in Terms of Tag-Robinson Colorimeter Colors. 



N. P. A. No. 

1.0 
1.5 
2.0 
2.5 

3.0 

3.5 

4.0 

4.5 

5 

6 

Q 



Slide No. 

G 

II 

I 

.1 
K 
L 
M 
X 


p 



Color 

Lily White 
Cream White 
Extra Pale 
Lemon Extra Pale 
Lemon Pale 
Orange Extra Pale 
Orange Pale 
Pale 

Light Red 
Dark Bed 

Claret Red 



Tag-Robinson Colors 

20.50 Yellow 

17.50 Yellow 

12.25 Amber 

10.25 Amber 

i».."ii Amber 

9.25 Amber 

8.50 Red 

5.24 Bed 
3.75 Red 
2.75 Red 

2.25 Red 



364 




If Uhmi««2w J?" 

■■*« tabe u4 fe (4 J 

"■»*■* s ucha«fdiJ 

•M»lard wkitr " J 

wauybeokiail: 

• " *« U. S. hmi\ 



Mil 



uaeter, eiwpt In m 
,*r>-a? t distil 



•tfor me of tk n» 

r ghats m* 

■ .• vita 

. : . for Urkti :: - ' 

lardi Co«plft?iJ 

ritudird ptoBgtr, 



lii 



^l^nlptaucnofSi* 



1250 



. 



tobinson ColoriffleW 0* 
rf 

5-24 B«d 

3.;'. b^ 

8JS B- 
3rf 



CENTRAL SCIE NTIFIC CO., CHICAGO, U. S. A. 



OIL TESTING 





No. 3107. No. 3829. 

3107. COLORIMETER, Lovibond Tintometer, for Standardizing Merchantable Petroleums. This set has 

been the standard of petroleum refineries for many years for gasoline, kerosene, naphtha ami 
other burning oils, as it offers a very simple means of grading these products. Consists of one 
monocular observation instrument; one 18 inch silvered metal cell with glass ends; one re- 
flector; four special standard glasses for water white, standard white, superfine white and prime 
white oils and a hardwood case constructed to open up in the form of a stand, which, when 
placed on a table of ordinary height, will bring the eye-piece of the observation instrument in 
a line with the eye. Complete as described $7200 

3108. COLORIMETER, Lovibond Tintometer, for Merchantable Petroleums, Intermediate, Russian and 

Lubricating Oils, same as above but with the addition of one 1/16 inch silvered metal eeU and 
five additional standard glasses, 1.5, 3, 4, 5 and 7. Complete, in hardwood case 96.00 

3105C. COLOR GLASSES, Standard for Lovibond Tintometer, furnished in three dominant colors of the 
spectrum, red, yellow and blue, for general work. For each of these colors there is a series 
of 155 shades of color, graduated from 0.01 to 20.0 tint units. There are 465 color glasses in 
all in these three shades. The tint units are derived from the wave length values of the dit 
fraction spectrum which lie between A 760400 and II 396319. This range is divided into 100 
parts which are the tint units. Each tint unit therefore covers a range of 3640 wave lengths. 
For eolorimetric testing of specific substances, arbitrary color ranges have been chosen which 
are not pure color tints. These are merely known as eolor glasses of a numbered series as, for 
example! the "50 Brown," "52 Brown," "200 Red," "510 Yellow," " 1180 Blue,' the "500 
amber series for refined oils, etc. 

To reproduce the National Petroleum Association Standards, Lovibond color glasses must be 

used as follows: 

M -p A - Ko 2.0 3.5 4.0 4.5 5.0 6.0 

N.P.A.NO... ; . is ..; (s 69() 7g0 <, 60.00 

Lovibond Glasses. . { 510 Yellow Series .... 32.00 39.00 50.00 35.00 93.00 60 00 

lll80 Blue Series °- j5 °- 55 r '"' _ , 

Per determining j*. *,-«**--£ — °; -»•- -~T J?^ S& 

glasses are used as follows: Water white, m oi sems , 

Red" and 0.1 to 12.0 of series "500 Amber. ^^ 2QQ 

COLOR GLASSES, single, as described 

Note.— In ordering, specify color series and number. 
3105E. METAL CELLS, Silver plated, accurately gauged with parallel plate glass ends to hold liouids 
whose color is to be matched with Lovibond color glasses. ^ g ^ 

Length, inches • 7 % g.00 12.00 18.00 

Each 

3829. CORROSION TEST 

petroleum products 
which can be pol' 
Mines.) Unpolished 

F3360. CORROSION TEST 

K pSelf'or the test. (See *-*-£"« ~ — -* ** 

tions for 1921, Serial No. D89-21T.) Unpolished 

365 











OIL TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. B. A, 



4152 



4 1 53 



9C40. 



2194, 
9G41 





No. 4152. 



No. 4153 




No. 9640. 

DISTILLING APPARATUS, for the destructive distillation of heavy oils and other liquids or 
solids requiring requiring a high heat. The distillation may be made by live steam or by direct 
heat, with or without agitation hy hot air blown through as desired. The still is of heavy copper 
with brass fittings, Capacity, 'j gallon $20.00 

DISTILLING APPARATUS, similar to No. 4152, but larger ami heavier, with cover bolted on and 
jointed deli \ -iv tube. 

No. A B 

Capacity, gallons 1 2 

Each 30.00 46.75 

DISTILLATION APPARATUS, for determining the boiling and end points of gasoline, kerosene, 
naphtha, other petroleum oils and paint thinners, according to the design of Committee D-2 of 
the American Society for Testing Materials, and recommended as standard for the testing of 
motor gasoline by the United States Bureau of Mines. The apparatus is also recommended for 
the testing of turpentine by Committee D-l of the American Society for Testing Materials 
under Serial No. D13 -IT. The apparatus consists of a eopper condenser trough with brass con- 
denser tul.e and iron support; a burner guard of galvanized iron with a door on one side; a 




iety 

tative 

Paper 

27.50 

iption and directions for use of No. 9640, send for Bulletin No. 47.) 

*, . . - PARTS AND ACCE SSORIES FOR NO. 9640. 

Burner, Alcohol Lamp, for use with Nn Qfi-in w l„ ... 

hot blue Booties .lane. „,„ Jen ture 1 »h Jnh l R SaS *\T avaiIable - Burns ™ th intensely 

Condenser onlv of \'„ MUfl \ Wa * , a . ol - Burns 3 hours at one filling $4.00 

n,i! ,t 1 •• no- h, : '.T,u ''■ I ; 0hsh ''; 1 , " 1 ' 1 '" r With *°PCOCk for SSLing, with inner 

•• - !!5 wSSSrVS ;;:;;;!:; ,,iai »^ r : —' : ' - *» -wfi Length* 

366 



'IE 







•^3. 



I 



' oils ad otto ku , 
■ •' • : ---: 

ai 

• . ... 



A 



1 
30.00 IS 

. ■Hil.Bf.kfflBl 

v •:. : ii."-:. 

•j .- ',■:•:■ •••-. ' 

- 
airtroogkwitlkni* 

i **««*> 

k€.rTKfftto<taj; 
w . with a<J< tej 



Ld for Boiletm 



>•: •' 



irol UPP* 11 Hi 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. 



OIL TESTING 





NO. 9649. No< 9647> 

Electric Heater in Use (With Shield Removed) Showing details of 

construction 

Parts and Accessories for No. 9640 (Continued). 

9642. Corks, specially selected for use in distilling flasks, sizes Nos. 6, 7, and 8 assorted, in bags of 
100 per bag, 1.40 

Flasks, Distilling, Engler, see general heading Flasks. 

Graduates, Cylindrical, see general heading Cylinders. 

9644. Burner G-uard, of galvanized iron, provided with a door on one side 7.50 

9644A. Transite Shield, cut to fit tightly inside of burner guard, constructed of % inch transit.- with 
a circular opening 4 inches in diameter and provided with a special brass clamp for attach- 
ing to iron support stand 2.50 

13622. Thermometer for Distillation of Gasoline, graduated to read from 0° to 270° C. in 1° divi- 
sions. Made according to specifications of the United States Bureau of Mines. Thermometers 
of other ranges or with Fahrenheit scale can be furnished shortly after receipt of order, if de- 
sired. (See Technical Paper No. 214, February, 1919.) 5.00 

13624. Thermometer, Solid Stem, Engraved Scale, same as No, 13622, but graduated from 20° to 520° 

F., in 2° divisions 5-00 

Note. — For A. S. T. M. and other distillation thermometers for use with No. 9640 Gasoline Dis- 
tillation Apparatus, see Nos. 13626-9 and No. 13718 under general heading Thermometers. 

9647. HEATER, Cenco Electric, with transite top containing a l x A inch opening for use with No. 9640 

Gasoline Distillation Apparatus in place of the gas burner. For complete description see next 

page. No A B 

1 Forvolts 110 220 

Each 1500 16 - 00 

9647 HEATER, Cenco Electric, same as Nos. 9647A and B, but with transite top with beveled opening 
L"., inches in diameter, for use with distilling flasks, Kjcldahl flasks, evaporating dishes, etc. 

Kn C D 

2°- ••,: .. 110 220 

^J° Us ;;;;;;;;;;;;;•;;;;;;;::;:;;;;:;::;;::;;;;::::::::... 16.00 17.00 

9647E. Transite Top, only for Nos. 9647C and D, with beveled opening 2% inches in diameter. . .50 

964 7 F. Transite Top, only for Nos. 9647A and B, with circular opening 1% inches in diam-ter.. .50 

9647G. Transite Top, only for Nos. 9647A and B, with circular opening 1% inches in <»»*M" us, 

when distilling petroleum products' having an end point above 470 F., or turpentine .50 

9648. Heating Units, for No. 9647 Cenco Electric Heater, for replacement. ^ 

S°- Z'\''ii"Ztii '.'.'.'.'.'.'.'.'.'.'.'.' AandC B and D 

For Heater No. 9647 ■ ■ ■ •* 2 .50 3.00 

9649. GASOLENE' DISTILLATION APPARATUS,' s am V a'sNo'. 9640, but with No.^9647 Cenco Electric 

Heater instead of the gas burner. No j*^, 2 20 

For volts .,'.'.'. 35.00 36.00 

•Note.— Although the Cenco Electric Heater is not inte "Jf '" £*^ purpwe" • 

not suflicient to maintain the required rate of distil a »°". > h h * 
conical asbestos shield is placed around the flask to conserve 

367 



















OIL TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A 




CENCO ELECTRIC HEATER 



Used in nitrogen 
distillation in the 
Kjeldahl method. 

n 







No. 9647 A. 



Used for ashing sub- 
stances c o n t a i ning 
easily volatile salts, 
such as soap stocks! 




Showing details of 
construction 




Used in the distillation of inflammable 
liquids of high boiling point. 



Used in determining boiling and end 
points in the distillation of gasoline. 







9647. 



HEATER, Cenco Electric, originally designed according to suggestions from Dr. E. W. Dean, 
of the I'niti «l States Bureau of Mines, for Boiling and End Point Tests of Gasoline. Its con- 
struction ami method of temperature control have led to its use for a variety of purposes for 
which a concentrated, intense heat is required, free from fluctuations due to draughts and free 
from danger of explosion of inflammable materials. 

The device Is constructed according to a new idea in electric heaters. By a special process 
of construction, the heating coil of chromel wire is securely held in the form of a conical helix 
in the solid block of insulating material by means of a refractory cement. The separate turns 
of wire are in contact with the refractory cement for only a small part of their circumference, 
and as a result, the heat wasted by absorption in and radiation from the block is reduced to a 
minimum. Tin- maximum exposure of wire surface, the conical shape of the depression in the 
block and the high heat radiating qualities of the cement combine to concentrate the heat 
upon the 1% inch opening in the transite top of the heater. Due to this method of construc- 
tion the heater re>pnn.N readily to changes in current produced by adjusting the rheostat, and 
facilitate; regulation of the distillation at the specified rate. The flask containing the gailiw 
breaka e e *" inteD8e hcat isufficient to ■«■**« paper immediately) without danger of 

tJL«\£^ insulating block in which it is inserted, consti- 

v v . AM , ^ g ?' T be u easilv re P laced ^ «>* «8er « case of a bum-cut. 

Tu-r.t ; t ". ( 'i ,S ? oimte f ln th < same ~se with the heating coil, permitting the tern- 

peraturc to hi* raised or lowered at will 






Btlml ^nVn nM**"? "^ %??*% P e ™ ittin g 5 * *" '«■ minted on nnv laboratory ., 
stand. Man> additioual uses will be found for this device in the laboratory as it fiirni 

t2Z££2&r TrK of co, """ ,ra "' 1 h " at """"■ " in "" f -HSS3L tTiS 





support 

shes a 

flame 




e been placed in laboratories, 
and of their adaptability for 

f Mines on one of the first 
mprovements have been made ia 

For volts A B C D 

KwneterofopMiing/iiii;;;;;;;; ;;.° 220 no 220 

Each . ' 1 1 V4 2% 2 % 

Note—For further dwcriirti'oM iiCMMri« m* " " " 15 '°° 16 °° 16 °° 17 °° 

47 and 93. ' atltsSones ail «* pncea Bee page 367; also send for Bulletins Nos. 

308 




■r : : 




Di L W 3» 
Tests of GinltK In* 
r t varifty of pirpak 



Brupddptf 

*»ftl Tfctvpittta 

■b«r onnffflK 

■ tk* bbekif ndierifci 

«r tO CO*- aki 

li thi « method W cflit 
witkott tor rf 






... tfitaPM* 

^rf.-ft*"*' 

let***** 



- - 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



OIL TESTING 








No. 9650. No. 9651. No. 9654. No. 9662. 

FLASH POINT TESTERS 

9650. FLASH POINT TESTER, Cleveland Open Cup, for high grade lubricating, mineral seal, and sig- 

nal oils, with cup made of heavy brass casting, nickel-plated. Complete with solid stem flash 
point thermometer, graduated from 20° to 760° P., and Bunsen burner for gas. (8ee Bulletin 
No. 314 of the U. S. Bureau of Public Roads.) $18.00 

13636G. THERMOMETER only for No. 9650, graduated from 20° to 760° F. in 2° divisions, scaled for one 
inch immersion 7.00 

9651. FLASH POINT TESTER, Cleveland Open Cup, modified to comply with A. S. T. M. Tentative 

Specifications for 1921 (No. D92-21T), provided with a metal plate covered with an asbestos 
board and a bead of proper size for testing the gas flame. Complete with standard flash 
point thermometer graduated to 760° F. in 5° divisions and Bunsen burner for gas.... 18.00 

13632. THERMOMETER only for No. 9651, solid stem, graduated from 20° to 760° F. in 5° divisions, 
scaled for one inch immersion 7.00 

9654. FLASH POINT TESTER, Elliott's or New York Testing Laboratory Type, closed cup, for testing 

low or high flash oils and asphalts. Complete with glass cover, solid stem thermometer grad- 
uated to 300° P., spirit lamp, thermometer holder, and directions for use. (See Bulletin 314 of 
the U. S. Dept. of Agriculture, Bureau of Public Roads; also "Laboratory Manual of Bitumin- 
ous Materials, ' ' by Prevost Hubbard.) 125 ° 

9655. PERFORATED GLASS COVERS for No. 9654 «**, - 70 

13636B. THERMOMETER only for No. 9654, graduated from 20° to 300° F. in 1° divisions, Ualedftr 
one inch immersion 

9662. FLASH POINT TESTER, Abel-Pensky closed cup, for low flashing oils, with clock work to ..pen 

cover and apply flame. With two thermometers graduated from 10 to oO C ia% and *° 
to 110° C. in 1< and burner. Complete in portable case with instructions for operation, (bet 
Technical Paper No. 49 of the United States Bureau of Mines.) -iou.uu 

9663. THERMOMETERS for No. 9662, enclosed scale, with metal ferrule. 

JJ° , :,' .'.*.*.'.'.'..' 10-50 40-110 

Range, degrees C 6 00 6 . o 

Each 

Note—For Aneroid Barometer for use with flash point testers, see general heading Barometers. 

369 














OIL TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 




■ •- - ' "- -P " * * * 30 " * ' s 4C '• * -* * Jl 



n 






n»;r,H. 



'.M>sj 





IMiSII 



9682, 



B710, 



97 10, 




No. 9668. 



No. 9680. 



No. 9718. 



FLASH POINT TESTER, Pensky-Martens closed cup, for low and high flashing fuel oils, consists 
of ;ui nil cup with cover in a metal heating vessel surrounded with a flanged top to prevent loss 
of heat by radiation. It ls provided with spring device to open cover and apply tin- test flame, 
two thermometers, cup lifter, gaa burner and directions for use. (See Technical Paper No. 298 
of the U. S. Bureau of Mines, and A. S. T. M. Standard Specifications for 1921, No. D93-21T. | 
$80.00 

THERMOMETERS, for No. 9668, for use in oil cup. scaled for 2V± inch immersion, and provided 

with metal ferrule. No A C 

Range, degrees F 20-230 200-700 

Size of subdivisions, degrees F i 5 

Each 4.25 8.25 

FLASH POINT TESTER, "Tag** Closed Form, for kerosene, volatile liquids and fuel oils, 
adopted by the American Society for Testing Materials and the National Paint, Oil and Var- 
nish Manufacturers' Association. Complete with two Fahrenheit thermometers, spirit lamp, 
■'"" l te-t dame burner tip. See Standard Specifications of the A. S. T. M. for 1921, No. D56- 
21 ■' 48.00 

FLASH POINT TESTER, "Tag- Closed Form, same as No. 9680 but furnished with two Centi- 
grade thermometers 48.00 

THERMOMETERS, only for Nos. 9680 and 9681," solid stem] scaled ifor 2% inch immersion, grad- 
uated in 1 divisions, with ferrule. No a R 



For tester No 



A 

9680 



Range, degrees _ ; _ 20 . 2 30F. 

Each 42 5 

MANUAL for Inspectors of Petroleum, containing correction tables for hydrometers, enabling 

ModiSus : "' V , "" 1| "" n,,u "" '" '"" 'I'-termined at a glance. For both 111.5 Modulus and 

MELTING POINT TESTER.'f or Wax', co£i .ting of" a'giass' cip for 'the wai' to be Vested,' with a 
r< movable metal top m which la se1 a thenuometer graduated from 90° to 150° P., in V divi- 



B 

9681 

o hoc. 

4.50 
the 

140 
1.60 






9718. 



MELTING POINT APPARATUS for pSSSffW ,I " S,, " ;, " ^ «*™«-^— — — ^ i2.60 
Society for TSn.M^t,Y S ' f or Paraffi * Wax. according to requirements of the American 




..7«i 



SeSB 




CENTRAL SCIENTIFIC CO., CHICAGO, U. 8 



OIL TESTING 





No. 9730. 



No. 13020. 



13653. THERMOMETER, only for No. 9718, solid stem, graduated from 80 ° to 160 ° F - in 0-2° divisions, 
scaled for 3% inch immersion $8.00 

9720. OIL TABLES, Tycos, containing all the data concerning gravities, temperatures, conversion 
tables, etc., of interest to the oil man 1.00 

SAMPLE BOTTLES, for Oil, see general heading Bottles. 

SAMPLE MAILING CASES, for Oil Sample Bottles, see No. 5989. 

SEPARATORY FUNNELS, see general heading Funnels. 

9730. STILL, Brown Oil, for fractionations and general distillations, constructed to meet the most ex- 
acting requirements. The still is made of cast iron surrounded by a cast iron frame, mount. id 
inside of a fire-brick furnace of the sain- general shape. The flame from the Bun sen burners 
plays between the frame surrounding the still and the fire-brick furnace. The still proper is 
heated only by heat which passes through the walls of the iron frame surrounding it. By this 
construction the top and bottom of the still may be kept at the same temperature ; or, if de- 
sired, the top can be kept heated to a higher temperature, or vice versa, by a slight adjustment 
of the flame entering the fire chamber. It is necessary when running an emulsified oil to keep 
the top of the still somewhat hotter than the bottom. The still permits the use of a sample 
sufficient in size to afford cuts that can be treated or otherwise examined; and it fractionates 
where fractionation is desired. Two large Bunsen burners are included; one for heating the 
still, and one for generating steam. Capacity of still, one gallon (half full). Complete as de- 
scribed with four vapor lines and discharge pipes, condenser with four compartments, discharge 
outlet, steam generator and auper-heater, Bunsen burners, three thermometer openings and large 
opening for cleaning purposes, with directions for use, without thermometers 195.00 

STOP-WATCHES, see general heading Stop-Watches. 
13020. SULPHUR APPARATUS, for the determination of sulphur in naphthas and illuminating oils, 
consisting of a glass absorber mounted on a wooden base, a chimney and a spray trap,, all of 
chemically resistant 2 lass. A small lamp, which is necessary, but not included With the ap- 



„+' o 9^ Frlf>nmpver tiask a cork earning" a short section 
paratus, mav conveniently consist 01 a to cc 



9738. 



lly resistant gla 
*, mav convenicnti. 
of glass tubing about Vs inch inside diameter and ordinary cotton wickiug. (bee A. S. T M. 

Tentative Specifications for 1921, No. D90-21T.) 

TESTER, 




cc graduated cylinder 
THERMOMETERS, see general heading Thermometers, 



371 






OIL TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. 



S. A. 




9742. THIEF, Blackmar Oil, for takiug 
samples from either top, center o-r 
bottom of tank cars, or other stor- 
age vessels. The receptacle re- 
mains closed until the desired 
point is reached when by drop- 
ping a lever it fills up and the oil 
is held intact until delivered into 
a container. The instrument will 
take 8-ounce samples and operate 
to a depth of 12 feet. Oil thief 
is in a zinc case, complete with 
eight 8-ounce cork stoppered bot- 
tles fitted into separate compart- 
ments in a substantial carrying 
case 25x11x3% inches, with lock 
and handle $50.00 

9746. THIEF, Glass, for Oil, improved 
form with rubber bumper. 2.75 



No. 9742. 





i 



\ 



No. 9756. 



No. 9759. 



VISCOSIMETERS 



9756. 



9757. 

5788B. 
9759. 



VISCOSIMETER, Engler, latest form, for light and heavy oils. Consists of a gold-plated oil cup 
with platinum outlet tube, surrounded by a brass water bath. Complete with two standard ther- 
mometers 10° to 50° C. and 10° to 150° C., flask graduated at 200 CC and tripod with ring burner. 
(See Bulletin 314 of the U. S. Dept. of Agriculture, Bureau of Public Roads.) $80.00 

FLASK, only of No. 9756, graduated at 200 cc. With government certificate 3.75 

FLASK, only of No. 9756, same as No. 9757, but without certificate - 70 

VISCOSIMETER, Ubbelohde, for gasoline and kerosene, similar to Engler in having a large shal- 
low container but differs in diameter of outlet tube, and in being provided with an overflow 
pipe to determine the initial level, instead of gage points as in the Engler. Complete with 
thermometer 50° to 100° C, flask and tripod with ring burner 9000 



5788A. FLASK only, of No. 9759, graduated at 100 cc 

13644. THERMOMETERS, only for Nos. 9756 and 9759. 

No A 

Range, degrees C 10-50 

Each 5.25 

13645. THERMOMETERS, same as above, but with government certificate. 

No A 

Range, degrees C 10-50 

Each 7.00 



B 
10150 
5.25 



B 

10-1 50 
7.15 



£0 



C 

10-200 
6.25 



C 

10-200 

8.25 



372 




CENTRAL SCIENTIFIC CO, CHICAGO, U. S. 



OIL TESTING 





9760. 



12954 



97C1. 
0762. 



9704. 



No. 9760. No. 9766. No. 9784. 

VISCOSIMETER, Saybolt Universal, as adopted by the American Society for Testing Materials 
and the U. S. Government. Adapted for steam, gas or electric heating. For testing cylinder, 
valve, and similar oils, with bath at 212° F, and oil at 210° F.; reduced black oils with bath 
and oil at 130° F.; and neutral spindle, paraffin, red and other distilled oils, with bath and oil 
at 100° F, or at any temperature from 70° F. to 212° F. Complete with electric immersion 
heating device with connecting cord and attachment plug, steam heater, gas burner, turn-table 
stirring arrangement, six thermometers, graduated flask, as illustrated, without stop-watch. 
(See A. S. T. M. Specifications for 1920, No. D47-20.) 

No A B 

For volts 110 220 

Each $92.50 92.50 

STOP-WATCH, for No. 9760 12.80 

Electric Immersion Heater for Saybolt Viscosimeter, see No. 7520 under general heading 
Heaters. 

FLASK, Pyrex glass, for No. 9760, graduated at 60 ec 1-25 

THERMOMETERS for No. 9760, solid stem, engraved scale. 

VISCOSIMETER, Saybolt Furol, similar in design and principle to the Saybolt Universal, but 
modified to reduce the time required for testing road, fuel and other heavy oils Viscosity is 
determined at 122° F. and is expressed as the number of seconds, Saybolt Furol; being the time 
in seconds for the delivery of 60 cc of oil. Complete with all accessories as listed under No. 
9760 Savbolt Universal, without stop-watch. (See A. S. T M. Tentative Specifications for 
1921, No. D88-21T, and Bulletin No. 5 of the U. S. Bureau of Mines.) ^ 

No 110 220 

For volts 92 SO 92 50 

Each 



9760 




9784 



9785, 
5559 

9647 



cvlindcr, and with instructions for use, but without burner 

water Determination apparatus, Dean-stark ^JJjJJffSSwSS?— S- 

hum products. Consists of a round bottom glass flask a gr *' ^™ rCC ^ ™g£ He ' ater . (Se e 

denser. Can be used with sand bath and gas burner or No. 9647 Cenco Wectrit ^ 

A. S. T. M Tentative Specifications for 1921, L>9b--I l .) 1QQ 

Receiver, onlv for No. 9784 , .38 

Flask, only for No. 9784, capacity 500 cc. . ,„ ... .. "• j"^^'"^ "i^hes" in'diameter, for use 
HEATER, Cenco Electric, with transite top with beveled opemn * 

with Xo. 9784 Water Determination Apparatus. Q D 

No ;:::: no 220 

For volts .... 16.00 17.00 

Each 



• ■•••• 



• • i • 



#••••• 



• t • • " 






373 



OVENS 



CEN 



XTRAL SCIENTIFIC CO^CHICAGQ, U. 



S. A. 





No. 9800. 



No. 9808. 



i» 






OVENS, ELECTRIC BAKING 

OVENS Baking, Despatch Electric, large size, specially designed for testing in flour mill and 
bakin" label atones where accurate and uniform baking is desired, but useful for any purpose 
requiring temperatuTea up to o00°F. or 26(J°C. They are made of polished steel with angle 
iron corner construction; have two-inch solid heat-retaining walls of asbestos throughout, two 
doors with double glass observation windows, two ventilators in tup and bottom; and are 
equipped with Despatch Open Wire Electric Heaters, wound with a special alloy wire which 
does not oxidize nor become brittle. These ovens have vitrified tile inner top and hard 
asbestos floor plates. All corner work, legs and trimmings are highly polished and nickel- 
plated. The ovens require about IV2 hours to heat to 5()0°F., then the current should be 
shut off and baking accomplished without further use of current, except in regulating and 
holding the heat at certain temperatures as desired. They are practically cool outside when 
iu use and there is absolutely no danger of fire. All sizes are 2-' inches deep and 27 inches 
high outside, and have a baking space 18 inches deep and 11 inches high. 

No 100 

Length, outside, inches 44 

Baking space length, inches 40 

Size of doors, inches 11x14 

Regulating switches - 

Max. current consumption, watts -<»00 

9800. For 110 volts $170.00 

OVENS, Baking, Despatch Electric, of same construction as No. 9800, but smaller, with one 
door. The door is fitted with double plate glass observation windows. A Three heat switch 
system gives the operator control by means of which the heat can be held at any desired 
temperature indefinitely, with a very low current consumption. The tile top with which the 
baking space in these ovens is made contributes not only to low current consumption, but 
supplies the place of a top heater and tends to uniformity of heat throughout the baking 
space. 

No 402 

Outside dimensions, inches 24x19x22 

Baking space, inches . 20x10x18 

Size of doors, inches 10x12 

Removable shelves 2 

Current consumption, watts 600 to 1800 

9804. For 110 volts 130.00 

OVENS. Baking, Despatch Electric No. 90, designed to meet the requirements of the small 
laboratory for test baking. This oven is intended for use in connection with I'r- 
Cabinet No. 5982, but may be used for anv purpose requiring an electrically heated oven 
capable of furnishing a temperature up to 500°F. Constructed of polished steel with double 
walla packed with mineral wool, top and bottom heaters amm-ed for three heat-, and ulass 
observation aoor. Depth of heating space, 12 inches; length, 20 inches; height, 11 inch 
current consumption on high heat, 1000 watts; on medium heat, 500 watts: on low heat, 250 
watts. Capacity, 4 loaves. 

No . A B 

For volts no 220 

Each r.rrrrrirrrjirrrrrrjrrrjir"*jirri"rjji 66.00 66.00 

374 



9808. 







--.-, 



* > '• 






- 
l 

» 

bet ealk. 

■ ■ 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



OVENS 






No. 9812. 



No. 9818. 



No. 6026. 



9812. OVENS. Baking, Hughes Electric. The walls and the doors have an insulation 2 inches thick, 
;iml the construction of the door mukrs it practically heat tight. The oven is provide.) with 
a three point switch, giving a current consumption of 150, 300 ami 600 watts. A tem- 
perature of 450°F. is reached in 20 minutes, and a maximum temperature of mni°F. may 
be attained, which may then be maintained indefinitely with the switch at low heat. Inside 
dimensions, 11x11x9 inches. Shipping weight, 55 pounds. Complete with temperature indi- 
cator, attachment plug and cord. 

No A 

For volts 110 

Each • 325.00 

9818. OVENS, Baking, Hughes Electric, similar to No. 9812, but of better construction, with nickel- 
plated legs and trim, and with the face of the door finished in white enamel. The oven has 
two heating units, one each at top and bottom, controlled by separate switches, giving 7 
degrees of heat. Each burner consumes 375, 750, and 1500 watts at low, medium and high 
heats. A maximum temperature of 600°F. may be obtained, of which 450°F. is reached in 
15 minutes, and the oven is so well insulated that it has been found on a pyrometer test 
that a baking temperature will be maintained for an hour after the heat has been completely 
turned off. Inside dimensions, 18x18x14 inches. Shipping weight, 125 pounds. Complete with 
temperature indicator, 

Jf°- •• !"."".'!'."!!".! no 

For volts 85 00 

Each 









* . .j 









31 


















We carrv in stock a complete line of equipment for milling, batag and grah »***^ 
oratories, i.m.uding electric baking ovens, ^»S ^^^^^Tm* VaValog o'r 



7ZETS2: ^ap^^s l^d bel^w Is one of our specalt.es. 

6026. VOLUME OP LOAP APPARATUS, £ J£»**. [^*^^?^? 

placement of flax or otHer seed. Cons at a of a ve ss I ^ ^ 

large to contain loaves baked in Baking ™ns jnos. . bread ig laced 



(Ut calculation. ,«. ™~^ ^ ^ ^.^ 

use of mustard, rape or millet seed is "J^^^ing f rom 1500 to 3000 cc in vol- 
support, graduated in cubic centimeters for loaves rang ng ^ QQ 



ume 



375 






OVENS 



CENTRAL SCIENTIFIC O^CHIg AGO, U " S " A 



OVENS, 
DRYING, 
ELECTRICALLY 

HEATED AND 
REGULATED 




9830. 
9831. 



No. 9830. 

• 

OVENS Drying Triple Wall. DeKhotinsky, Electrically Heated and Regulated (patented), 
with bimetallic regulator and new system of ventilation providing for greatest possible uni- 
formity of temperature throughout the oven chamber. 

Construction- These ovens are constructed of asbestos slate on a steel frame and are well 
finished in white enamel with all metal parts nickel-plated except the base, which is ja- 
panned Three walls are provided, the space between the two outer wahs bring parked with 
the most efficient insulating material available, an 83 per cent, magnesia asbestos mixture, 
which effectuallv prevents radiation of the internal heat; and the space between the inner 
walls used to conduct the heated air upward from the heating units in the base, aids in dis- 
tributing the hot air uniformly. Ports arc provided in the inside walls of the oven for 
the entrance of the heated air into the drying chamber, in which it passes up and out 
through an opening in the false top. The location of these ports has been carefully and scien- 
tifically determined so as to provide a continuous current of heated air to ever] corner of the 
drying chamber, making the temperature uniform throughout. This feature (patented) 
is peculiar to the DeKhotinsky Triple Wall Oven, and insures a uniformity of tempera- 
ture not possible in electrically heated ovens of any other type. Double doors are also 
provided, the outer door being double walled and packed with the magnesia-asbestos heal in 
sulating material while the inner door is of glass for the inspection of the interior without 
cooling the contents. The outer door is beveled on the edges, making close contact, when 
dosed, with the walls, thus preventing leakage of heat. Between the two doors is a dead 
air space for insulation purposes. 

Heating of the oven is effected by means of our standard heating units of Chrome! wire wound 
on mica strips. These heating units are mounted in a removable tray or drawer which 
facilitates their removal for inspection or replacement without disturbing or materially cool- 
ing the contents. One of these heating units is connected in series with the contact points 
of the thormo-regulator, while the remainder are connected in parallel to the switch contact 
springs and may be added to the circuit one at a time to obtain any desired temperature. 

Temperature control of the oven is secured by means of our bimetallic thermo-rcgulator 
(patented) which is made from invar-brass ribbon, and can be set at any desired temperature 
from that of the surrounding air up to the maximum heat capacity of the oven- This 
range of temperature permits the use of these instruments as incubators, paraffine baths, dry- 
ing ovens or sterilizers. The precision of action of this thermo-rcgulator is V < '■ The make- 
and break contact of the thernio-regulator is located outside the oven, to prevent im- 
possibility of ignition of inflammable gases, which often occurs when the contact is mad-' and 
broken inside, A pilot lamp on top of the oven is connected in series with the thermo-rcgu- 
lator, enabling the operator to determine at a glance whether the oven is regulating. These 
instruments can be operated on either A,C. or D.C. circuits. Complete with receptacle and five 
feet of flexible asbestos covered cord with separate attachment plug. No. B ? 

Height inside, inches ] | fcj l!» : S 

Width inside, inches 12 ^ 

Depth inside, inches ....... 1 1 : | 1* 

shelf space, square inches 282 476 

For 110 volts .........]..,. $140.00 220.00 

For 220 voits !!!!!!!!!!!!!!!!!!!!!!!! 140.00 220.00 

;:7h' 



■ 





CENTRAL SCIENTIFIC ^ CO., CHICAGO, U. ft A. 



OVENS 



1 udbntaad 



9840. 



•ills bdaf p 

• -i brtWtt 

- . ■ 

walls vf tkr mU 

s a taif «r '*» 

t rr*. Dotbk far 

* * 

*t ioi tf tfc* idfti * 
. * tat 

taiti of CkK»Ira w 
•raj ' 4n«?<Jj 

. . •• 
. *itk w «» 

t * * • ' . * 
red t«sf«a» 






i 



B197 








D852A 

9852B 


if ©Tf 1 » "I" 








1 
'* 1 












, 1 


9854 A 


.-. 


9854 B 


$14000 


, 1 




140.00 





Nos. 9852A-B. Nos - 9854A-B (Patented). 

Note: — For High Temperature Ovens for temperatures up to 2(iu «'., s0 ,- No. 9926 DeKhotinsky 
Electrically Heated High Temperature Oven. 

Extra Heating Units, for DeKhotinsky ovens. Current consumption, 100 watts. 

No * A B 

For volts 110 220 

Each $0.75 .75 

Note: — In ordering replacement units for DeKhotinsky ovens it is necessary to give the serial 

number which will be found on the name plate. 

Pilot Lamp, only for DeKhotinsky ovens. Capacity, 0.4 ampere; for use on 6 volts .50 

Note: — In ordering replacement lamps for DeKhotinsky ovens it is necessary to give the serial 
number which will be found on the mime plate. 

OVENS, Drying, Single Wall, Cenco, Electrically Heated and Regulated (patented), with De- 
Kliutinskv bimetallic thermo-regulator. For work requiring the greatest precision of regula- 
tion and uniformity of temperature, we recommend our DeKhotinsky Triple Wall Drying 
Oven. (See description under No. 9830.) 

Construction: The oven is built of %-inch asbestos slate on a steel frame with a foundation of 
%-inch asbestos slate The heating units are placed in the bottom and the heat is distributed 
throughout the drying chamber by air drawn through openings in the bottom beneath 
the units and heated as it passes through and over them. As uniformity of temperature is 
not possible of attainment in a single wall oven, we make no claims for it in these ovens. 
Where uniformity is not essential, however, these ovens will be found very convenient and 
satisfactory. Two shelves of the grid type are provided, which, by means of racks, may be 
Bet at any desired height. The oven is mounted on a japanned steel base 

Heating of' the oven is effected by means of our standard heating units of chrome! wire wound 
on m.ea strips, some of which are connected to the switch and some to the bimetallic thermo- 
regulator for automatic control to the desired temperature. notnntoA himPtillir 

Temperature control of the oven is effected by means of the DeKhotinsky patented l »»£aHie 

thermo-roffulator which is made from invar-brass ribbon, and can be set at any desired 

,„, "era, ufe from That of the surrounding atmosphere to the maximum heat capacity of the 

oven, about 140° C, which it will maintain with a constancy of ± ^.^..J^^-^of i'ni 

contact of the thermo-reguhi. or is located . outside he oven to , u t h. ; ... ,b h of ig^ 

tion of inflammable gases ^^fVl",™^ in serles with th * 

and broken inside the oven A pilot lamp on top ol lie oven 

then,,,, relator, enabling the operator to >****»» • ^ ^ * itg c lete with recep . 
lating. These ovens can be operated on either AC. or u -\-J:>" , r 

taclefand 5 feet of dexible asbestos covered cord with att 1" > ,,1Ug Vo ltage, 

Width, Depth, Height, "LM* ^etfSpace, ™tag» fe Price 

Inches Inches Inches Cu. Inches «M™ UQ 50 .00 

n 10 12 1320 g 220 5000 

11 10 l2 -n, „«.^ oiL"wpated and Regulated, of same construction 

DRYING OVENS, Single Wall, Cenco. Electrically Heated and * ^^ of heating unit9 . 

as Nos. 9852A-B, but larger, with two doors and witn a g 

With same equipment as Nos. 98;,2A-B. Shelf Space, Voltage 

• Width, Depth, Height, ™. JnsnM, ^ A . C . & D .C. Price 

Inches Inches Inches Cu. 1 n < n* ■ 4 n0 75.00 

18 12 14 3024 430 220 75.00 

For Exlra Heating Units for Nos. 9852A to 9854B, see No. 9840. 

377 






OVENS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 








No. 9870 



(Showing a Single Compartment Oven, 
Half the Size of No. 9864) 



9864. 
9865. 
9870. 




9880. 



OVENS, Drying, Despatch Electric, especially designed for moisture determinations in soils 
flour, etc. They are practically uniform in temperature, having a three-point regulating 
switch, whereby the temperature can be held at 212°P. Provided with top and bottom ven- 
tilators, which greatly expedite the drying process. Made of polished steel with angle iron 
eorner construction, and with all fittings nickel-plated, with 1-inch solid heat retaining walls 
of asbestos, and Despatch Open Wire Electric Heaters, wound with special allov which will 
not oxidize nor become brittle. With two compartments, either of which mav'l.e used sen 
arately if desired, since they are non interfering. Drying space of ca.-h compartment- 20 
inches wide, 16 inches high, and 18 inches deep; si/..- of doors, 16x20 inches; maximum power 
consumption oi each compartment, 150 watts. (Illustration above is of a single compartment 
oven, but serves to show construction.) 

No A 

Outs.de dimensions, inches 50x24x22 

.Number oi compartments ., 

F0rll ° V0lts $225.00 

F ° r220VOltS 225.00 

OVENS. Drying. Despatch Electric, for moisture determinations in soil, flour ete Of special 
value ,„ „„ii,n R al„.rator,c. for Pekar slick teste. Similar in construction to that of Xo 

Xo 

For volts A B 

Each 110 220 

48.00 48.00 

OVENS, DRYING, FOR GAS OR OIL HEAT 

^-; ™^^ ' 

Outside dimensions, inch ^ ^ ^ 

Each 6x8x6 8x10x8 10x12x10 

8.00 10.00 13.00 

378 






CENTRAL SCIENTIFIC CO, CHICAGO, U. S. A. 



OVENS 




• ""' 



ire 

• ! 

. 

Mis 

. 




i 


9884. 


c I 




- ' 




•OL 


9892. 


1 




1 

m 1 


9894. 


hi EAT 1 


9924. 


1 
1 

10.00 I 





Nos. 9880 & 9884. 





No. 9894. No - 9924 ' 

OVENS Drying. Double Wall, same as No. 9880, but with water jacket, with tuoulationa for 

thermometer and gas regulator. With two shelves. ^ B C 

No. 6g6 8x10x8 10x12x10 

Outside dimensions^ inches 4%x6%x5% 6%x8%x7% 8%xlO%X»* 

Ins.de dimensions, inches a §13 00 16.00 20.00 

Each 
OVEN, 




30.00 



Condenser, Soxhlet, for use with Oven No. 9892, «cO« Med ^ ^ an(] 

OVEN. Drying. Single Wall, of copper covered throughout 3Q QQ 

pitch testing. Size. 8x10x8 behM.. • . ; . - • • ^• r ^;; ; " r ;;'i' n a Vurrent of hydrogen, etc. Made 



ship .iimensions, iox*u »*««*■ --—-:~ • d thermometer, dui «» UB ui s<*b- -■ 
and with openings for vacuum connections, ga e e 82 . 5 

thermometer ■ ■ ' „Xth nnv' enstomers in the design and manufacture of 

Note:-We shall be pleased to co-operate w ith our customer^ ^a & department which 13 de , 

constant temperature ovens for special pur [°^ S ^ ature ap pliances. 
voted entirely to the development of constant temper 

379 



OVENS 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 









OVENS, HIGH TEMPERATURE, ELECTRICALLY HEATED AND 

REGULATED 



!»!»LV). 
9927. 




Nos, 9926-7. 



OVENS, High Temperature, Triple Wall, DeKhotinsky Electrically Heated and Regulated (pat- 
ented), similar to No. 9830 DeKhotinsky Triple Wall Drying Oven but with the addition of a 
sufficient number of heating units to give a temperature range to 260°C. This oven can be 
used for high temperature evaporation and drying, for baking of enamels, for disintegration 
tests of dyes and other organic compounds, and for any other uses where a regulated high 
temperature is essential. (For complete description see No. 9 



!is:;iu 
No 

Height Inside, inches 

Width inside, inches 

Depth inside, inches 

Shelf space, square inches 

For 110 volts '......'..'.'.'.'.'.'.'.'.'.'.'.'.'. $16CU)0 

For 220 volts 



B 
14 
12 

11 
282 



160.00 



c 

19% 

17 

14 

476 

250.00 

250.00 



OVEN, Vacuum, DeKhotinsky. Electrically Heated and Regulated, announced some time ago, 
was, at the tu.u- tins catalog was going to press, undergoing changes iu design to further 
improve its performance. Announcement of its completion will be made later in bulletin 
form together with illustration and full description 





99.->0. 



99.'. 1 . 



Na 9950 ' No. 9988. 

OVEN THERMOMETERS, see general heading Thermometers 

°!22i^E2rai S rr nS '; 1 , ' ,r *r ln *<*' ^3" ozone by the discharge of an 

(i. «trn current. Complete with wooden support . G25 

SS .n^S'' g,aSS tube °" lv " f X "- 9950. without 'foil." .' £00 

PALLADIUM TUBE, see Gas Analysis Apparatus. 

PALM GLASS, see Pulse Glass. 

PANS, Baking, see Flour Testing Apparatus 



ir.'SH 




Brass mounted; black figures on 

substantial instrument. Furnished 
mg board 1.50 



;;Sn 



nr*t\SK 



'**' 



I I 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



PAPER, ALL KINDS 



PAPER 




PAPER, Adams, Fat Free, for Milk Analysis, see No. 9266. 
PAPER, Asbestos, see Asbestos Paper. 
9992. PAPER, Blue Print, 30 inches wide, In 10 yard rolls p er ro n, 

9994. PAPER, Blue Print, in light-proof packages of 24 sheets. 

Size, inches 4x .-, 5x7 

Per package 20 .25 

9996, PAPER, Cochineal, in sheets 8x10 inches p er sne et 

Per quire 

9997. PAPER, Cochineal, in glass vials containing 100 strips Per vial 

Per dozen vials 
10000. PAPER, Congo Red, in sheets 8x10 inches Per sheet 

Per quire 
10002. PAPER, Congo Red, in glass vials Containing 100 strips Per vial 

Per dozen vials 
PAPER, Cross Section, sec Cross Section Paper. 

PAPER, Drawing, see Drawing Paper. 

PAPER, Emery, see Emery Paper. 

PAPER, Filter, all kinds, see Filter Paper. 

10004 PAPER, Glazed, for collecting filter ashes, etc., in sheets 20x24 inches. 

No A 

Color black 

Per quire - • • -90 

10006 PAPER, Lead Acetate, in sheets 8x10 inches Per sheet 

Per quire 

10007 PAPER. Lead Acetate, in glass vials containing 100 strips Per vial 

Per dozen vials 

10008. PAPER, Litmus, blue, in sheets 8x10 inches Per sheet 

Per (juirfc 

10012. PAPER, Litmus, blue, in glass vials containing 100 strips,... Per vial 

Per dozen vials 

10016. PAPER, Litmus, neutral, in sheets 8x10 inches P« ^et 

10020. PAPER, Litmus, neutral, in glass vials containing 100 strips Per vial^ ^^ 

Per sheet 

Per quire 

Per vial 

Per dozen vials 



$1.00 

8x10 
.40 

.09 
1.00 

.15 
1.00 

.09 
1.00 

.15 
1.00 



10024. PAPER, Litmus, red, in sheets 8x10 inches 

10028. PAPER, Litmus, red, in glass vials containing 100 strips 

10034. PAPER, Methyl Orange, in sheets 8x10 inches |« sheet 



10035 



. PAPER, Methyl Orange, in glass vials containing 100 strips 



Per vial 

Per dozen vials 

.Per quire 

Per sheet 

Per quire 



10036. PAPER, Paraffin, in sheets 12x18 inches.. 

10040. PAPER, Parchment, vegetable, in sheets 18x24 inches 

10042. PAPER, Parchment, genuine animal product, in sheets 17x22 inches 

10043. PAPER, Potassium Iodide, in sheets 8x10 inches 

10044. PAPER, Potassium Iodide, in glass vials containing 100 strips Per vial^ ^^ 

inches P er sn "* 

Per quire 



B 

white 
.75 

.29 

1.00 
.15 

1.00 
.08 
.90 
.10 
.90 
.08 
.90 
.10 
.90 
.08 
.90 
.10 
.90 
.10 

1.00 
.15 

1.00 
.20 
.05 
.50 



1004o. PAPER, Potassium Iodide-Starch, in sheets 8x10 
10045A. PAPER, Potassium Iodide-Starch, in glass vials con 



taining 100 strips. .Per vial 

Per dozen vials 



10046. PAPER, Sand, in sheets 9x11 inches. 

No 

Per sheet 



* ■ • • •■••t 

* • • • ■ 



On 
.05 
.45 




.05 
.45 



Per quire p er sheet 

10048. PAPER, Starch, in sheets 8x10 inches Per quire 

Per vial 

Per dozen vials 

Per sheet 

Per quire 

Per vial 

Per dozen vials 



10049. PAPER, Starch, in glass vials containing 100 strips . . 

10030. PAPER, Turmeric, in sheets 8x10 inches 

10051. PAPER, Turmeric, in glass vials containing 100 strips 



Per sheet 3.75 

Per sheet .09 
Per quire 1.00 

.10 

1.00 

.09 

1.00 

.15 

1.00 

2 

.07 
.70 

.09 

1.00 
.15 

1.00 
.09 

1.00 
.10 
.95 



1 

.06 
.50 









381 






PAPER TESTING 



CENTRAL SCIENTIFIC CO., CHICAGO, U. B. A. 



PAPER TESTING APPARATUS 




No. 10072. 




No. 10071. 



10072. GLARIMETER. Ingersoll, for Measuring the Surface Gloss or Degree of Finish of Pauer 
Leathers, Furniture and Automobile Finishes, recommended bv the Paper Test.,,- funimitt^ 
of the Technical Association of the Paper and Pulp Industry. This instrument was incited 
.y it L. k Inp-rsuii „t the rjniversity of Wisconsin in connection with research work on 

»ai»er for the LiuU-.i States Forest Products T.'.iw.minrir .,,..! ,i fl ,„.;i — i i... u.-_ *_". - t. n 



" • "• ,r . *" v v..«.»« .>n_» ..i »im-uiimii in riuin.Trion with research work on 

paper tor the United States Forest Products Laboratory and uV>,.ibed bv him first in Elee 

Z ZV M ± Mart: lV' 1914 J a,,,i later in the Joun,al oi the Optical Society of Aperies 
May 1921; Paper, February '.'. 1921 j and Paper Industry, March 1921. * AmerKa » 





/ ' '"- " '", ■'"" cne - Nuo1 I ,nsm ^n be rotated, the angle of rotation beim? 

indicated on a scale oi degrees, as in a polariscope. The tube is m „„,7ted with its ax ITS 
,.n,xn„ : ,»,.h at the angle of maximum polarizatioS of light reflected f,,„ t ^ Sa 

read on the scale For each d *r . «, -l , i Ik * ? ?u an S ular Position for equality 
ting of the Nico prism ami -7 h % eJtr « t J" ""S" 8 th f re co "«ponds a partUular set 
surf:,,,, of the paper? ' "' therefore . ha s a definite meaning as regards the 

T, m,::' ;;;; u :;;i::,r i : , 1 ,;;; ii ;;;';i; t ; 1 ;:. «* 2- T ,,,, 7i of p r r or ? the * m * teriai ~ ■■«■ <»*««— 

not move from hi. \L\ "in, A tl ' " '",': , ';'° Ugh a snia11 ^oor, so that the operator need 

«•'" ordinarily Ughted room Xn n, ,' i f^ST C * D '"' awnrately and quickly made in 

without previous ,-xr ,.-i,' ( . alSr'SfhntS ?' '"' ^mT^ " ,:U1 "» opiate the instrument 
maker to .standardise ?h iSof wSto .."T J* 6 Glarimcte ' "* «■«• the paper- 
photographic or other stock with pre ■ i iVtm 1 ™ I,erc ** nde ! €d > coated, machine finish, 

""■ *i* ' finish he desires ol an v " „f st L t" ""-' •'" ' ■ paper '" iv " r to E Tv 

over opacity and eolor feliminati™ ,11, ■ ? ' us S ,v,n & hlm an automatic control 
over-cab, " termination of dark color caused by sacrificing color for gloss by 

Slarimeter as described, with electric bulb ,-..,i ,1 , . . 

iH-ts. .mun.l ,1,.. ,,,,,.. ,„,. r .,, J; ' ' ,/' ' % plate to use as color filter for colored prod- 
stock, and connecting cord and plug ^tensity "t Light when working with highly glJ 1 

(P0X " • I " t - 1 " 1 ^^on^'io^^n m:\oo.) S20 °' 00 




130.00 



:;s2 



'-*'...'■ 





''-'- 






- : • r: 

r •••-••.. . 



iektmi Br rati: 
".at fru 

- - 






■ -a! tu be BAM 

rat of* rate tW i«W* 
itti aatiiK a* 

• matii «m 

.::■■■■■■' 



■ with * 



•■ 



ii hirirr 



■>*£ 



7 






CENTRAL SCIENTIFIC CO., CHICAGO, IT. S. A. 



PAPER TESTING 




No. 10084. 



No. 10078. 



No. 10102. 



1007G. PAPER TESTER, Mullen, for measuring the bursting strength of paper, cardboard, textiles, 
etc. By turning the hand wheel, the fluid pressure is applied upon B circular area of 1 
square "inch, and the pressure required to hurst the paper is registered upon the \iu\>c ia 
pounds per square inch, A rubber diaphragm prevents the fluid from wetting the paper. 
This test is required upon all paper purchased by the United States Government $125.00 

10078 PAPER TESTING MACHINES, Hand Operated, for Tensile Strength, Breaking Test after 
Folding and Tearing Strength of Paper. Originally designed as a cloth tester, but provided 
with flat (Trips to take paper samples. Tin- tester is constructed on the dead weight or pen- 
dulum principle, without springs or delicate parts to wear out or cause trouble. The pull W 
registered automatically by the pointer on the dial until reset by the „,„ rator. Mounted on 
oak back board with iron brackets for attachment to wall. Total length of machine, about 

4 Jf et , .. 100 150 200 250 

SSI?: ff B "kctoryi \\ I "I '. V. \\\ I ! " " ".'. "/. . ■ ^"> 130.00 135.00 145.00 
10084. PAPER THICKNESS GAGE, standard, for use with any paper from tissue to heaviest card- 
board. Reads thickness direct upon dial in thousandths ol an inch, up Jo M^wn ^JJ 
danger of error 

PARAFFINE BATHS AND OVENS 




t i: kp,l conner 12% inches in diameter, 3ft inches deep, 

10102. PARATFINE BATH, round form, of polished < PP or ' '" - geven of ,,,.,.,, f ormj 2% inches 

with sheet iron base, 7>, inches high Th. ■>■ a re * v ^ ^ ili;1M1( . tt . r ailll % inch deep, 

in diameter and 1% inches deep, and three i an ow, - tb Md tubulation9 tor 

wateh glass shape. With five tubutetions mtt £*££ M rcgulatur 32.00 

thermometer and gas regulator. Without burner, 

383 







.'• 



PARAFFINE BATHS CENTRAL SCIEN TIFIC CO., CHICAGO, U. S. A 




No. 10114. 











Nos. 10136-9. 



No. 10122 (Size 3P). 

10114. PARAFFINE BATH, Miller, of polished copper, 8 inches long, 4 inches wide and 4 inches deep, 
provide. l with an extra sheet iron bottom to prevent burning out, and an iron base 5 inches 
high. The bath baa two nickel-plated nips, one shallow and one deep. Tin- shallow Clip is 
2% inches In diametei and 'i inch deep, watch glass shape, and the deep one is 2% inches 
in diametei and 1% inches deep. Complete with two drawers to hold slides, and with tabula- 
tions for thermometer, gas regulator and for five test tubes, but without burner, thermometer 
or regulator $28.50 

PARAFFINE EMBEDDING OVENS, simple form, see Drying Ovens Xos. 9880-84 ' 

PARAFFINE EMBEDDING OVENS, DeKhotinsky Electrically Heated and Regulated, see In- 
cubators X.is. 7S9H to 7900. 

PARAFFINE EMBEDDING OVENS. Wood Frame, Electrically Heated and Regulated, of same 
construction as Xo. ,<nm Incubators, but with thermostat adjusted and tested at 56°C. before 
shipment. For full description see No. 7908. 

2°: ;V'" : i""'-M 2P 3P 11P 31P 32P 41P 

Height inside, inches 26 12 15 30 26 30 

Width ...side, inches is 9 12 20 18 2 

Depth inside, inches 18 q mi/ is i« 1R 

Number of shelves ."....... 1 1 i 3 \ 3 

U°J\lhtYf"*my\"L double single double double double double 

aeigni 01 stand, inches o.> 

Shipping weight, pounds ' 14V ..'>' { R ' V.V lan SSfl 

0123 For 2*0 v S 106 - 50 43 - 00 6900 "COO 119.00 142.50 

-3. For 220_volts 1065a 43 QQ ^ QQ ^ QQ UQQ0 liZ50 

construction to Xo. 11)130. 
and stop-cocks to enable the 
.ys for drying and fixing pur- 

iches hich * B "' a " u so ^ 2 * ncncs deep, with enclosed 

10136. Without heater... nM 

10137. With gas heater ....... ! £?'«£ 

10139. With electric heater ??™° 

PARAFFINE EMBEDDING BOX' see' No" ttM 

PABAFFINE EMBEDDING TABLe! 2e ^8936. 

384 







^je** 




CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 




No. 10164. 




PENCILS 




No. 10170, 



No. 10174. 



ft* 



TV iktJin 

o bold Ada, »*1 ru :» 

: witkwrt bw>cr,tknat 

82 



tated tad BegBbM xek 

iMtedaud^saitti'-^ 
• • i at 3«*C UB 



P 

4 



31P 
M 
30 
13 

3 



:• 
13 

1 



I 

! 



J 



able donl»I« *J 









00' 

oo 



isaoo us; J 

„ 130.00 lW» 

•^^^ imp 



PARR CALORIMETER, see Calorimeters. 
PASTILLE PRESS, see No. 2400. 

10156. PENCIL, Litmus, made like an ordinary lead pencil, one end blue, the other end red $0.30 

10% discount in lots of 12. 

10160. PENCILS, Wax, for -writing on glass, porcelain, etc. Also used for Bkin marking for physio- 
logical and anatomical purposes. 

No A B C 

Color Mtie red y.dlow 

Each 15 .15 .15 

10% discount in lots of 12. 

10162. PENCILS, Wax Crayons, for marking on glass, porcelain, alundum, etc. Need no sharpening and 
the marks do not run when heated. The blue burns to an indelible mark on porcelain. 

No A B C 

Color • I fadt hlue red 

Each 10 .10 .10 

Per dozen 1°0 10 ° 10 ° 

10164. PENCIL SHARPENER, Boston. Simple and durable, for standard size pencils. Celluloid box 
holds dust and shavings. New cutters readily inserted 10 ° 

10170. PERCOLATORS, conical, heavy glass. 

Capacity, pints \ 

Each - 80 ~ 

Capacity, gallons % ^ 

Each 

10174. PERCOLATORS, Oldherg's, heavy glass, narrow form, almost cylindrical 

1 2 

Capacity, pints g " 1>00 L20 

Each y y j 

Capacity, gallons x 8 " 300 

Each 

PETRI" DISHES, see Culture Dishes. 

PHOSPHORUS TUBE, Goetz's, see Centrifuges and Accessories. 

PHOTOMETERS, see Gas Analysis Apparatus. 

PHOTOMETERS, Parr's Sulphur, see Nob. 2378 and 2380. 

385 




PHOTO-MICROGRAPhlC 



CENTRAL SCIENTIFIC CO., CHICA GO, U. S. A. 






No. 10180. 



No. 10188. 




PHOTO-MICROGRAPHIC APPARATUS 

10180. PHOTO MICROGRAPHIC APPARATUS, Wilson, for photographing specimens under the micro- 

scope without th.' necessity of removing tin- specimen to a special apparatus which may cause 
considerable inconvenience in locating the particular object of interest, ('imsi^ of a modi- 
fied band camera taking plates .". '» by 4 v i inches, supporte<] on a rigM upright rod which 
in turn is supported on a heavy cast-iron base. I-ietween the two longer t'.rr <>t tins base are 
adjustable stop- which may be adjusted to any microscope to always bring it to the same 
position. The camera may lit- rotated in any position through -'i'"'" in a vertical and hori- 
zontal plan--. This- makes it available for copying or ordinary photography. In addition to 
the special adapters and extensions, an excellent rapid rectilinear lens and automatic shutter 

a re supplied. Wit h one plate holder $100.00 

10181. Plate Holder, for use with No. MlM) IMmto-micrographie apparatus 2.00 

lo]sx. PHOTO-MICROGRAPHIC APPARATUS. Type LD, arranged so that it may be used for photo- 
micrography with the microscope either in a horizontal or vertical position, also for drawing by 
directing the image on a horizontal drawing board by means of a reriecting mirror placed over 
the eyepiece. It is very rigidly constructed and will he found most satisfactory for general 
laboratory work. 

Supporting Stand of cast iron; feet of stand have lateral spread of 25 in.; base plate, carrying 
camera bed and optical bed for 'Ruminating accessories and microscope plate la » "» x T in. and 
39 hi. from the floor. 

lUnmlnattafi System— Consists of a 5 -ampere, 90° hand feed arc lamp with rheostat for 110 
•>.i aspherlc condenser In focusins mount; support for rav filter; one ground glass, one 
blue glass and one gTeen glass lilt- » All of these parts are mounted on a support adjust- 
able for height and with micrometer adjustment for vertical and lateral adjustment. 

Microscope Plate— Attached to optical bed by means of clamps so that the microscope may be 
moved along :he optical bed to bring it to the desired location either for drawing or for 
connection with the camera. 




DraniiiK Ilonril -Of WOOd, Death 

porting stand, which 
position ; supplied with \ el 

d< \ • d. 



neatly finished. 14 in. square; adjustable on front standard of sup- 
graduated so that one can readily reset the board at anj particular 
elvet hood on adjustable standard to shield hoard from light when 

Complete as described, with are lamp illuminator 285.00 

10189. Plate Holder, for use with No. L0188 Photo-Micrograpbic apparatus 2.00 

Prices on Nos. 10180 and 10188 subject to 10- discount to hospitals and educational institutions. 

386 







m 



JS 



- 



- bring it to * a 
HP* in i vernal ui » 
pholacrapkT. hik* 



. 



lit it hit be wri to p 

- : - Iff 

n - ..nirwrpb* 

i 

tkit the »*?*?£' 






CKXTUAL SCIEN TIFIC CO., CHICAGO, U. S. A. 



PHYSICAL CHEMISTRY 







No. 10210. 



No, 10212. 



No. 10214. 




No. 10226, 



No. 10230 





•'■it 






No. 10234. 



No. 10236A. 



No. 10236B. 



No. 10236C 



PHYSICAL CHEMISTRY APPARATUS 

BATTERY CELLS, all kinds, see general heading Batteries. 
BRIDGE, Conductivity, see No. 10436. 

BRIDGES, Wheatstone, see Electrical Apparatus; also page 404. 
CALORIMETERS, see general heading Calorimeters; also page 404. 
10210 CELL Conductivity, Arrhenius, for poorly conducting liquids, with electrodes of platinum L4 mn 

Weight of platinum, about 5.1 grams. With hard rubbei cap 
h ' $33.00 



in diameter, held 10 mm apart 



10211. 
10212. 



1.75 



10214. 



10226. 




10230. CELL, Conductivity, Koilrauscn-Holborn tor V—y^--—^^ ho Ranged as desired, 
supported in adjustable rubber cap so that the distance ai s 2Q25 

Weight of platinum, about 4.2 grams ■ " ' ' 100 

Glass Cell only of No. 10230. . . . • ■ ■ ■ ■••• •-• ■•• - ; ;." "-V " 'J-itb 'platinum electrodes 15 mm in 

CELL, Conductivity, Ostwald, f o ± poorly c on' netug Ikju Is wit up ^ ^^ 



10231. 
10234. 



• ■ ■ ■ 



102:;-. 
10236. 



eter, held 20 mm apart. Weight or pi -.num. -™ •■ - 15 50 

*-*° 

Jell only of No. 10234. • • ,; •••;■ '-^ VaVefu'llv made with the purest materi- 

1, Conductivity, Washburn, a tenet i of three. ceils ca e ^ ^ ^ red ocal ohln . 

nd capable, of measuring condnctmt^rangng tnm « ^^ 



Glass Cell only of No. 10234.. 

CELLS 

als am 

(See Journal of Amoi. Chem. So,-., Vol. XXXVIII, 191b, pa„ 

No 

Range in mhos 

Weight of platinum, gms :•:':: 

Each (price of platinum not included) .... 

387 



B 
I0-»to2xl0- 1 3xl0 ; to 3sl0- s 
11.00 4 ---' 

18.00 1600 



c 

lto 1" 

12.1111 
20.00 






PHYSICAL CHEMISTRY 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 








No. 10237 A. tfo. 10237B. No. 10237C. No. 10237D. 



No. 10238. 








No. 1028. 



No. 1031. 



No. 1032. 





102 .5 7 A. CELL. Conductivity, Dipping Electrode, for good conductors, for immersion in liquids to be 
tested: in protecting cylinder, with platinum electrodes. Weight of platinum, about 1.3 grams. 

' $15.00 

10237B. CELL, Conductivity, Dipping Electrode, for poor conductors, with parallel platinum electrodes. 

Weight i>t' plat in mil, about 1.2 grams 15.00 

L0237C. CELL, Conductivity, Dipping Electrode, for poor conductors, similar to No. 10237B, but of 

larger capacity. Weight of platinum, about o.G garni 15.00 

102371). CELL, Conductivity, Pipette Electrode, for poor conductors, for measuring solutions affected 
by the air and for measuring solutions at 100° C. With glass stop cock. Weight of platinum, 

about 1.6 grams 17.00 

10238. SUPPORT for Conductivity Cells, consisting of heavy non-corrosive metal base and rod, with 
damp for holding cells, hard rubber terminal with mercury wells and binding posts and with 
clamp for attachment to thermostat. 

No A B D L 1 

For Cell No 10210 10214 10226 10230 10234 

Each 9.00 9.00 9.00 9.00 9-00 



102G. 



1027. 

1031. 



1032 




1033. 



STANDARD CELLS 

CELL. Standard, glass part only, with platinum wins, for those desiring to make their own 
standard cells. This is the regular H form ami may be used to make any of the ordinary 
forms of standards .... 1.50 

CELL, Standard, glass part only, without platinum wires 90 

CELL. Standard, Bame as No. 1026, on stand as illustrated 3.50 

CELL. Standard, Eppley, for students' use. This is an unsaturated cell made up for students' 
use, without the sam< degree of care being exercised in its manufacture as is employed in 
making up cells for precision purposes. It is, however, correct to 1/5 per cent., and may be 
calibrated against a .citified standard cell and a correction factor established. Permanently 
sealed m glass With depolarizer protected from the light and mounted ,,n wooden support U 

shown 8- 00 

CELL, Standard, Weston, unsaturated type, Model 4. Consist of an H*haped "receptacle wit* 
platinum leads which pass through the bottom. One limb of the cell contains cadmium amal 
gam; the other mercury and a paste of mercurona sulphate The cell is filled to slightly 

I -ul'rnti , n r " S y m V- ,th ^ U "- , "' ; ' t "' 1 -•'"""" Of e.dminm sulphate and sealed to prevent 

b-iw'e, i""'H '''''l lV,^ s s ;; ,,:,, iV , ' , ^^ , .■ , i v, ' ,,, th . e ■■*"*«*■ from becoming mixed. B. M- P- 

OKA 7mL2m £Lt a V ° ltS - x^ ,th n ' : "' l >^t".ers' certificate Of voltage 25 00 

CELL. Standard. Westcn. Same as No. 1032, but with Bureau of Standards certificate.. 29.50 

388 






■- 



■ i[^** 



J* ft g s 




CENTRAL SCIEN TIFIC CO., CHICAGO, U. S. A. 



PHYSICAL CHEMISTRY 




- 






m 

penDel platiiu fkra 

lil 

.14 S* IflOTB, te rf 

lil 

K»llti*»l&ffl 

t * . ■ 

lil 

t IB-tal l«« Ud IK 

uJ blading posts aid 

D E \ 

i 1* 
NX) W '' 



^Uf lit rf the ^ 




No. 10239. 




No, 10240. 



No. 10244. 



No. 10246. 







No. 10248. No. 10250. No. 10252. No. 10265. 

10239. CONDENSER, Variable Air, with Vernier Attachment, for use in balancing the capacity of the 

cell in conductivity measurements. The condenser is carefully made, well insulated ami com- 
pletely shielded by means of an aluminum case. A seale is provided with 100 divisions, and 
a knob and lever handle for adjustment of the condenser and vernier plates. Capacity ,00007 
to .001 microfarad $21.80 

10240. COULOMETER, Washburn's Iodine, as used at the United States Bureau of Standards for deter- 

mining the value of a Faraday. Complete as illustrated with anode of platinum iridium, 
cathode of platinum, bulb tubes, and ground-in siphon tube. Price dependent upon market price 
of platinum. (See Journal of American Chemical Society, Vol. XXXVI, No. 5, for May, 1914, 
page 916.) 

ELECTRODES, CALOMEL NORMAL AND HYDROGEN 

10244 ELECTRODE, Calomel Normal, Drucker, with f us«d in platinum electrode attached to a coiled 
piece of copper wire cemented in a glass protecting tube to permit repairing connecting Wire 

when broken , V : * * ' VV " " "y M 

10246. ELECTRODE, Calomel Normal, Hildebrand, with glass stop-cock on siphon tube and fused-m 
platinum electrode attached to coiled wire as in No. 10244. (See Journal of American Chem- 
ical Society. Vol. XXXV. No. 7, for July 1013, page 851.).. •• ... .... S-WJ 

10248. ELECTRODE, Calomel Normal, Ostwald, with removable platinum electrode and glass stop-cock 

. , .-i _ o.UU 

10250. ELECTRODE/calo'mel Normal,' Pauli, 'fo'r liquids 'of high resistance, with removable P^tinum 

electrode, and short siphon tube 
10258. 

1021 

10266. 

angle. The l"™^"^ bubble breaks 

•zas before escaping irom this opening n""i" ci . 




(Continued on next page.) 






389 



PHYSICAL CHEMISTRY 



CENTBAL SCIENTIFIC CO., CHICAGO, U. S. A 




!■■ 




No. 10266. 



No. 10267. 



No. 10268. 



No. 10269, 





No. 10272. 








Nos. 10278-9. 



No. 10280 




No. 10276 



No. 10281 



ELECTRODE, Hydrogen, Bunker — Continued. 

the liquid rushes into the tube again surrounding the wire. In this manner tin 1 sainr effect is 
produced as with a rocking electrode. Complete with platinum electrode, hydrogen inJ.-t tube, 
electrode vessel, stop-cock tube and 3-holr rubber stopper. (See Journal of Biological Chem- 
istry, Vol, XLI, No. 1 for .January liiL'n, p:ige 11.) $4.85 

102<>7. ELECTRODE. Hydrogen, Clark, for use in Hydrogen Ion determinations. With two Btop- cockfl 
as illustrated; without platinum electrode. (See Journal of Biological Chemistry, Vol. XXIII, 
\... 2, for Dec. 1915, page 475.) .' 10.00 

Platinum Electrode, for use with No. 10267. ('msists of a pice.- of platinum sheet 6 mm square 
attached l»y means of platinum wire to the lower end of a glass tube 40x6 nun 2.50 

Connecting Vessel, Clark, for establishing a liquid junction between the calomel electrode and 
V>. 10267 electrode 7,50 

ELECTRODE. Hydrogen. Hildebrand, with S-shaped" platinum electrode" so situated th'aVhalf its 
surface is immersed, the other half exposal to th.- -as. With side tube for introduction of 
gas. (See Journal oi An an Chemical Boriety, Vol. XXXV, No. 7. for July L913, 



KlL'tiV 

10269. 
10272, 






10276. 



-•■«j) 5 50 

ELECTRODE. Hydrogen, McClendon, especially adapted "for use in measuring the H-ion*concen 
tration ol solutions ot which only small quantities are available as in the examination of 



10278. 
10279. 

10280. 
10284. 




ELECTRODE Hydrogen Oswald, with gaeintVoduction tube i^ X wit.', ^ ^,,-cock, 

Ele'rtrode X N n,' >7ft tC T^ *****" " f **» *«* ™thout platinum electrode. 4.50 
WeuS o? oUti, "•,"'.' 1Um fml attf, " ,,, • ,l ,0 K ,a!W tuh " i'^ted in rubber stopper. 

v\<'i^ht nt pint iiimn, rtlifiut I.J grams A co 



ELECTRODE. Hydrogen. _ w«dt. n, „« d h,"w:„r, HH.Ti.i™ A^»to N» IMt 




"-~~ r TL 







i Bluer th <£.- :■ •• 
itogaii 

i*arul of Koiopr- 
■■ 

; 

U 

ii • : 
■' 

g the 

mhbrf'Wff*^ 

k i S' 

^ofthe^ 



rKXTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



PHYSICAL CHEMISTRY 



V 



V 



No. 10286. 



No. 10287. 



No. 10294. 




r 



COO ML 



; so co 



-•■■-a* 







No. 10300. 



No. 10301. 



o o 

No. 10305. 



E 



10286. 
10287. 



SUPPORT for Calomel and Hydrogen Electrodes, consisting of a heavy non-corrosive metal 

base and rod with clamp to hold glass cells.. $3.00 

SUPPORT AND SHAKER, Combined, L. & N., designed for use with the Clark electrodes for 
supporting the calomel electrode and connecting vessel and for shaking the hydrogen slefl- 
trodes. Consists of a heavy tripod base with clamps for holding glassware, binding posts for 
electrical connections and motor driven shaking device into which the hydrogen electrodes 
are securely fastened. Illustration shows two No. 10267 Clark Hydrogen Electrodes, one No. 
10269 Connecting Vessel and one calomel electrode in place. Complete with electric motor, 

but without glassware or connections. No A B 

For volts 110A.C. HOD.C. 

Each 75.00 75.00 

CAPILLARY ELECTROMETERS 
10294 ELECTRODE TUBE, Capillary, Luther, filled, exhausted and permanently sealed, with platinum 

6-00 



contac 



1 



10298. ELECTRODE TUBE, Capillary, Ostwald, with platinum wire sealed in 
10300. 



2.00 




i;:v;.;:.^.a:.ihfo,u F ;,.i, .;;,:.;. ,;;;,;:,„>• £««*»;> *, ^^ y . « -.. n <>- .*«,*«. 



,,.,| 60.00 



10304. 



nennita the extent of motion of the meniscus to be measured ^'"ll^'l"' 

IecT^OES, Half Elements, consisting of two glass vessels on supports wttfc .heavy non- 



llli'.O.l. 




style' :::;::::::::::::: platinum foil platinum n,«g saver sp, 

Pur-h . . 1.00 • yU 



ral ziuc rod copper rod 



.60 



.50 



Ki.'-.im;. 

10307. 

lu:;08. 



Each 
Glass Cell onlv of No. 10304 



«■••••■* 



1.10 



Glass Cell onlv of No. 10304 ■;• ■ • • • ■ ■ v" ',""*- .60 

Glass Cylinder onlv of No 10304 L for ' eonnectin. : the ^J-/^^ nding - post a nd depres.ion for 

Mercuiy Contact Cups only of No. 10304, of hard raomjt 85 

mercury. With knurled screw for fastening to support rods 



391 


















PHYSICAL CHEMISTRY CENTRAL BOIKXTiMC CO., CHICAGO, U. S. A. 






No. F4464. 



No. F4466. 






GALVANOMETERS FOR HYDROGEN ION AND CONDUCTIVITY 

MEASUREMENTS 

11 164. GALVANOMETBR, Portable, for use in H-ion measurements and eleetro-titrations. This in- 
brumenl was designed in response to a need which arose in connection with eleetrometric 

titration apparatus. There was not obtainable on the market at that time an instrument suf- 
ficiently sensitive to serve our purpose. The development of a galvanometer which would be 
suffii iently sensitive, and at the same time be portable and convenient in every respect, re- 
sulted in the instrument which is here offered. The moving system is suspended in a resilient 
mounting with phosphor bronze suspensions, which are light enough to insure good character- 
istic s but strong enough to sustain even severe jolts. Period % second. Resistance 750 ohms, 
Sensitivitj :'. to 4 megohms $25.00 

I' l 166. GALVANOMETER. Alternating Current, for use in place of a telephone receiver for determin- 
ing the point of balaiii-r of the bridge in < •« >u<hietivit v measurements. This instrument is par- 
ti, ulaily valuable for measurements in industrial or plant control work in which the line fre- 
quency of 6n cycles is employed, and in which the high degree of precision required for re- 
seareh work is not necessary. The three chief advantages of the galvanometer over the tele- 
phone r«(ei\ er are: 

1. It permits the use of 60 cycle current. 

2. Noises do not prevent securing a satisfactory balance. 

3. The deflection of the pointer indicates in which direction the bridge is unbalanced. 
The galvanometer has a laminated field electro-magnet, the winding of which is conn.! ted di- 
rectly a< ross the 110 volt A.C. line. Three binding posts at one side of the top of the case 
enabh three different voltages (3, 6 and 9) to be connected across the bridge circuit Two 
posts on the other side constitute the terminals of th.- moving coil of the galvanometer. 
Sine- the current (lowing through the moving coil is in synchronism with that in the field 
magnet, a steady deflection is produced. 

It is advisable to use a one-to-one transformer between the line terminals and the galvano- 
meter in all measurements in which the electrolytic cell or tank and connections are not prop- 
erly msulate,| fro,,, the earth, in order to avoid damage from high voltage due to the practice 
Of grounding the middle of the transformer in A.C. distribution circuits. 

Complete as described with connecting cord and separable attachment plug 60.00 

r 1 1*7. Transformer. 50 watt capacity, with one-to-one ratio, for use with Xo P4466 15-00 

For other GALVANOMETERS, see pages 191 to 193 and 204. 



292 





N** 



N DUCTIVITY 



-WtnMk 

lvuoneter which nk* 

■ 

. : ■_-. ■: 









Iom receiver for tons 

'. a isstnmeit is » 

in which the li»i fs- 

precision required i«fr 

.-A . iAoa\et«r ora tk * 



> bridge is oW^ 

B -on**** 
| tnetopoftk* 

, tie bridge eirrait !■ 

f the gal**"* 

« with thit ii * tf 

, rvialb tti ^ ^ 

• :.■:-•■ "" 



. 






rut P»»- 
40 



till 





CENTRAL SCIENTIFIC CO., CHICAGO, U. B. A. 



PHYSICAL CHEMISTBY 





No. 10310. 



No. 10309. 




No. F4404. 



HIGH FREQUENCY GENERATORS FOR CONDUCTIVITY MEASUREMENTS 



loauy. 



GENERATOR Audio-Oscillator (Microphone Hummer), for producing a practically pure sins- 
wave current at a constant frequency of 1000 cycles from a 6 volt battery. Tins device a the 
best suited for student use in conductivity measurements of any which we have been able to 

locate. It is automatic in operation and free from trouble. Its energy output IS ample for 
all practical aeeds in conductivity work and its low price makes it availably « >»']"»*"* 
equ pment for each desk. To avoid confusion between the sound of the controlling Cork and 
tha Tin the telephone receiver, the Audio-Oscillator should be placed in a BOUn. 1 -proo ^ l„,x 




alternating current, the frequency of wh ich oqua Is the . ^ d .„ pftra Hel or in series 
the r.p.s. of the motor. The two secondary ™dings may be jonm -^ P f 12 in th( . 
by means of external binding posts, Producing ™^*^j£$£j£%^ I four 

latter, 24. The output La about 2 watts, and .» amj e f or t he s^ ^ a V DC 200i00 

stations As described, with universal motor tor use on 11" A.v. i»" . / 

stations, as (ithinuiu, *„„ rt „ „« v nf nhout 1000 vibration- per 



a frequency of about 



pe 

mm 
.00 



F44, ,4. INDUCTION COIL simple form ^ ™£X^ E&lX*,* with fe„ 10 i 

second. Mounted in a sound proof box iuuxluuxi >u 1Q 

" ION DETERMINATION APPAI^T^ 

_ ..ion by means of Cms Electrodes rTos. 1WJ»*™ Electrode (No. 10244 to 10252), 

r No. 10436 Conductivity »"dge together^ Wit] ha fa omel . Elect ^ por(able ^^ 
„..e of our Resistance Boxes (see Nos. F4703 to JWggj > 1033) . A Capillary Electro- 
meter, and an appropriate source ot current («os. ■ Galvanometer. For a com- 
meter (Nos. 10294 to 10300) can be usedif desired instea 
plete self-contained outfit, see No. 11WI-. 

393 



thick 

HYDROGEN 

Concentrat 
ou 

one 









PHYSIC AL CHEMISTRY CBNTBAL HC1KNT1F1C CO., CHICAGO, U. S. A. 









Fig. 1. 



Diagram Showing Scheme of 
Connections. 



No. 10312. 







HYDROGEN ION DETERMINATION APPARATUS 

L0312. HYDROGEN ION DETERMINATION APPARATUS, Cenco-Wendt. The application of elec- 
trical m.-tiin.u ,,f iin-usim-mem and control to chemical tactions has Ij<t.>iiii> s.. important dur- 
ing the past iru years that chemistry faculties are making increasing demands that their stu- 
dents be tau-ht tin- l'uinlaiiientals upon which these methods are based 
Th, Cenco Wendl Btoctro-Titratiuu Apparatus is excellent n„t only t\. r [.ractical measurements 
with the hydrogen electrode, but its .l.-sig., features make it a valuable device for educational 
work as well It can be used for ihe measurement of electrode potentials of all kinds up to a 
potential difference oi 1.2 volts without polarizing the source bVi„ K measured. 











.- ... .... experiment. The rods ar«- firmly Be- 

where this is JeoufrS wl "Xn* \ u "* !"" ^i 1 "' 1 ' 1 a * ,irrh 'K '"""" >' k ' '»"' *'•• '-^ 
chem stry offer ne cin«e^?« ?Ik g ? recommend this apparatus to departments of physical 

S p^ysfology" ndThe Ve£cT S °c7en ef "Tr"* !T?°^ *° ^^ ° f Chemi ^ W " 
or Bend in, BulhYti ft ■ ,, . cucal s «ences. (For complete description, Bee pages 216-217 

beaker !. . ._- f.^. .'^ lUu8trated 1 but »<>t including stirring motor/burettes or 

lnj.c'. Electrode, Calomel, only of No, L0312 S150.00 

L0284. Electrode, Hydrogen, of No L0312 " 7 '°° 

r... Burettes for use with X... lnMl^'/see'pagV: «.!,'- ioo 5-75 

12860. MOTOR STIRRER. Cenco Universal Friction th™ V 

tinuous agitation durine tttrSE «^ "? V, for u " Ulth Nn - 10312 for maintaining con- 
without stirring rod! ' '" Wlth <■"""•-'"'- cord and attachment plug, bul 

No 

A l; c D 

Poi volts A..G D.( 

Each no 220 110 220 

12861. Flexible Shaft and Guide, 'for" as'e with No' Vsrn' ^'°° . 37 °° 35 " 00 37 °° 

Bide, where i1 will not interfere with th/»; 1 ' " U!,,,,,, 'K «»* Stirn-r to l- turnr.l to one 

,; " 1 '" 1 "' ""• «W snppor SSiSfX EK ° £ *••«»»** The guide Is 

"' "' ,l " - "* h * angle clamp furnished with X... L0312. 
4.00 

94 



■ .T 



JD« ' 



CENTRAL SCIENT IFIC CO., CHICAGO, U. S. A. 



PHYSICAL CHEMISTRY 




jJ 



, 






iatus 

Tk ipffcoa 4 

• ■ • - .. 



-s -■ 



• • » our N • ■' 
, ie^utmesft of pijij 
students of cho:-' 

urna* motor, *<■ J 

B 3 

3S0O * 

: •■" 




No. 10314 Front View. 




No. 10314 Rear View Showing Standard and Dry Cells in Place. 



l.i:i 



314. HYDROGEN ION DETERMINATION APPARATUS, Cenco Demonstration Form. The present 
gnat interest in hydrogen electrode measurements has given rise to a requirement for a sim- 
ple apparatus by means of which the measurement of hydrogen ion concentration can easily 
be demonstrated to an audience. To meet this need we have designed this apparatus, now 
offered for the first time, which consists of a potentiometer circuit so arranged that the Boren- 
sen number (pH) or the hydrogen ion concentration is directly indicated when the potentio- 
meter is balanced. Although the apparatus is intended only for demonstration, it is capable 
of accuracy to 0.1 pH unit and of a precision (repetition of setting) more close than this 
figure. 
The upper picture shows a front view of the instrument, the side which is seen by the audience. 
The scale length is 140 cm so that the length of one whole pH division is 10 cm. Along the 
upper edge of the scale is the slide-wire on which contact is made by a movable contact 
spring. The latter carries a transparent rider with an index line. Values of the hydrogen 
ion concentration are read on the lower, and pH numbers on the upper scale. The former 
is of the multiple logarithmic type, graduated similarly to a slide rule. Any reading under 
the index represents the multiplying factor of 10 with a negative exponent, the entire number 
representing normality of hydrogen-ions. The negative exponent of 10 has a numerical value 
indicated by the nearest pH number to the right of the index. 
In the rear view of the Instrument are seen first the rheostat for the coarse adjustment of the 
working current, and a single slide- wire, on the left, for fine adjustment of this current. In 
the second compartment should be two dry cells connected in series for furnishing the work- 
ing current. These are to be connected to the posts marked "BATT.' In the middle sec- 
tion are two tapping keys for connecting the galvanometer in circuit when desired. The 
left hand key also puts into the circuit a high resistance which protects both galvanometer 
and gas chain against excessive current when the potentiometer is far from balance. The 
galvanometer is connected to the binding posts marked "GAL V." The pair of binding posts 
to the right of the kevs serves for connection of the calomel cell and hydrogen electrode re- 
spectively, and the remaining pair for connection of the standard cell. The double throw 
-witch enables the demonstrator to connect either the standard cell or the gas chain into the 
circuit. Finally a sliding contact, shown on the right of the illustration, enables one to take 
care of the possible variations in calomel electrode potential. 




latter case the balance is obtained by moving the compensating slide before mentioned. This 
automatically establiebes the proper relation between the scale and the Ada irire. The 

potentiometer is now ready for readings on solutions of unknown hydrogen .on concentration 

and for titrations. 




tential, ami for this reason 
chemi 8 try- 



In 



addition to the Demonstration Hydrogen Ion D 
emonstration equipment a Standard < ell mi mi 
ure Table Galvanometer, for which No.^ r 44W1 ^ 
up of anv standard typo of hydropen ai 
he used in connection with the \Ven<i 



I) pterin 
as our 
(pape 
and calomel 
t Apparat 
two pieces toff 
the potentiome 



ination Apparatus, there is required for a complete 

r \o 1032; two Dry Cells No. 964 ; a sensitive Lee 

ir 204) will serve very nicely I ■*• *•<»£ ■■* 



iH'inonstration Apparatus. 

measuring H-Ion concentration; toe P 0,e """"£' c ," "J" 'a "calibrated voltmeter „oiTr™n 

Hildebrand method, using an indefinite poten ti al «*■"£ standard Cell Or §*££■£ 

Complete as described, with rheostat but witnout ary $gQ 0Q 

meter 



W' 
























PHYSICAL CHEMISTRY CENTRAL SCIENTI FIC CO., CHICAGO, V. S. A. 






No. 10367 Shown in Use. 



No. 103-10. 



No. 10361. 




With hygroscopic solutions, but without thermometers 

Parts and Accessories for No. 10340. 
10341. Air Jacket 75 

i 142. Cooling Vessel with nickeled cover and stirrer 4.50 

in:: i;:. Filling Pipette .' 10Q 

10344. Freezing Tube, with corks 10Q 

1-1:14:,. Freezing Tube, with ground in Btopper and ground in tabulation for thermometer 2.50 

in:; h;. Inoculating Rod 

l03>7 ' *£££ $£ «n£2sr *■ '""""'"''* :a '" m L '' *"- ' :i; ' v """' ; - ' Pri « de - endent - 

1034V Sulphuric Acid Drying Tube 

13454. Thermometer for cooling mixture, graduated from -*.n° t„ Kn° r> ;» i - 1 , - caa 

,o,-^« ™^ feiduuduu irom .iu to on ( ., in 1 ., degree divisions 5.00 

3518. Thermometer. Beckmann Diffe.ent.al. with auxiliary »,,„., „„,„„„.,, „ I/In0 . llivW ,.,.„„ 

10350. Zmc Trough, with Biphon 

10351. Siphon only of No. 10350 

10364. MOLECULAR WEIGHT DETERMIN 1 '° 

Method. Consists of an iron Buppoi 
ground stopper and tubulature, and \ 

10 Argand Burner f.„ X„. 10364, wi,l ,„,,,„,„„.,. »•***» 6. so 

*. ■-^fciiH*.. wi„, m,,,,;,,. , lf ,;„;,;■,,;;„,;:,;,;;•„:;„•:,;,;.;•;;;„, ;,, 

Thermometer. Beckmann Differentia.. f„ r ^'i^^"^; "^ ^ 65 ° 

■396 







UIUK 



L^Em 



V 



r ^m 



•KN'TKAL SCIENTIFIC CO CHlOUfi tt « * 

_ 1 Z2 ^ ttA ^AGO^ g. S. A. PHYSICAL CHEMISTRY 




*7 8fcon 



■Ik 



ion's, by tte ftufej 
• . 
Hi 

til 

1* 

1* 

m 

I 

Price dejaW" 
bos * 

,J6i IJ* 
II 

, by tiw Boili»J ' 

■'is 

..■,.--■.■: 

t.rr» y 

: 
Wlt b i«"> er e#ia S 





No. 10376, 



No. 10380. 




No. 10384 



10376. MOLECULAR WEIGHT DETERMINATION APPARATUS. McCoy, consisting of a graduated 
inn. t vessel and jacket with rubber connection between. (See Journal of American Chemical 
Society, Vol. XXII, for April 1900) $1.50 

10380. MOLECULAR WEIGHT DETERMINATION APPARATUS, Menzies, for determining molecular 
weights by measurements of the vapor pressure, The apparatus conaista of a graduated inner 
vessel and outer jacket ground togeth